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Patient Management

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Question 201Question →

A 24-year-old woman, gravida 1, para 0, comes to the emergency department due to a 1-day history of intermittent, crampy, right-sided lower abdominal pain and mild, dark vaginal spotting. She stopped taking combined oral contraceptive pills 3 months ago to try to conceive. Her last menstrual period was 5 weeks ago. Her temperature is 37.0°C (98.6°F), blood pressure is 115/72 mm Hg, and heart rate is 84/min. Physical examination shows a soft, non-distended abdomen with mild tenderness to deep palpation in the right lower quadrant. There is no guarding or rebound tenderness. Pelvic examination reveals a closed cervical os with a small amount of dark blood in the vaginal vault. There is no cervical motion tenderness, and no adnexal masses are palpated. A point-of-care urine pregnancy test is positive. A serum quantitative β-hCG level is 1,100 mIU/mL. A transvaginal ultrasound demonstrates an 8-mm endometrial stripe, but no gestational sac or yolk sac is visualized. Both ovaries appear normal, and there is no free fluid in the cul-de-sac. Which of the following is the most appropriate next step in the diagnostic workup?

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Answer: Measurement of serum quantitative β-hCG in 48 hours

Answer

Measurement of serum quantitative β-hCG in 48 hours
The most appropriate next step in the diagnostic workup is to measure the serum quantitative β-hCG in 48 hours. This patient has a pregnancy of unknown location (PUL), which is defined by a positive pregnancy test with no intrauterine or extrauterine pregnancy visualized on transvaginal ultrasound (TVUS). Her β-hCG level is 1,100 mIU/mL, which is strictly below the standard discriminatory zone (typically 1,500 to 2,000 mIU/mL, and up to 3,500 mIU/mL in some modern institutional guidelines). Below this threshold, an early, viable intrauterine pregnancy often cannot be seen on TVUS. Because the patient is hemodynamically stable and lacks acute peritoneal signs, the standard of care is to repeat the β-hCG level in 48 hours. A normal, viable intrauterine pregnancy will typically show an appropriate rise (usually an increase of at least 35% to 53% over 48 hours). Abnormal trajectories, such as plateauing or falling levels, would suggest an ectopic or failing intrauterine pregnancy, thereby prompting further investigation or intervention.

Step-by-Step Solution

1
Evaluate the patient's clinical stability and severity of symptoms.
The patient is hemodynamically stable with normal vital signs and only mild, non-peritoneal pelvic pain.
Determines whether emergent surgical intervention is required or if a step-wise diagnostic algorithmic approach can be safely pursued.
2
Analyze the initial laboratory and imaging results to categorize the pregnancy.
The quantitative β-hCG is 1,100 mIU/mL, and the transvaginal ultrasound shows no intrauterine or extrauterine pregnancy, categorizing this as a Pregnancy of Unknown Location (PUL).
Allows comparison of the patient's hormonal level against the established discriminatory zone for visualization of a gestational sac.
3
Determine the appropriate diagnostic sequence based on the relationship between the β-hCG level and the discriminatory zone.
Because the β-hCG level (1,100 mIU/mL) is below the discriminatory zone (typically 1,500-2,000 mIU/mL), serial testing is indicated rather than immediate definitive action.
To accurately distinguish between an early normal intrauterine pregnancy, a failing pregnancy, or an ectopic pregnancy without prematurely interrupting a potentially viable gestation.

Key Concept

In a hemodynamically stable patient with a pregnancy of unknown location and a β-hCG level below the discriminatory zone, the standard next diagnostic step is to repeat the serum β-hCG level in 48 hours to assess the trajectory of the pregnancy.
Question 202Question →

A 34-year-old woman comes to the outpatient clinic reporting a three-day history of swelling, erythema, and a dull ache in her left calf. Her past medical history is notable for systemic lupus erythematosus, currently managed with hydroxychloroquine, and a history of two unprovoked deep vein thromboses in her early twenties. She also reports a history of three consecutive first-trimester pregnancy losses.

Vital signs are:
Temperature: 37.1°C (98.8°F)
Blood pressure: 118/76 mmHg
Heart rate: 82/min
Respiratory rate: 14/min
Oxygen saturation: 99% on room air.

Physical examination reveals non-pitting edema of the left lower extremity to the level of the knee, with mild tenderness to palpation over the popliteal fossa. The right leg is normal.

A comprehensive metabolic panel and complete blood count are within normal limits.

Coagulation studies show:
Prothrombin time (PT): 13 seconds (normal: 11-15 seconds)
Partial thromboplastin time (PTT): 58 seconds (normal: 25-40 seconds)

A mixing study with normal plasma fails to correct the prolonged PTT. Compression ultrasonography of the left lower extremity demonstrates a noncompressible segment in the left popliteal vein.

Which of the following is the most appropriate pharmacologic management for this patient?

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Answer: Initiation of low-molecular-weight heparin and oral warfarin

Answer

Initiation of low-molecular-weight heparin and oral warfarin
The correct intervention involves bridging a parenteral anticoagulant (low-molecular-weight heparin) to oral warfarin. This patient's presentation—recurrent deep vein thromboses, multiple pregnancy losses, systemic lupus erythematosus, and a prolonged PTT that does not correct on a mixing study (lupus anticoagulant)—is highly diagnostic for antiphospholipid syndrome (APS). For secondary prevention of venous thromboembolism in APS, lifelong anticoagulation with a vitamin K antagonist (warfarin) is the standard of care. Because warfarin initially causes a transient procoagulant state by depleting proteins C and S, bridging with a parenteral anticoagulant is mandatory until the INR is therapeutic.

Step-by-Step Solution

1
Analyze the patient's history and clinical presentation.
The patient has a confirmed acute deep vein thrombosis (DVT) in the setting of systemic lupus erythematosus, recurrent prior DVTs, and multiple first-trimester pregnancy losses.
Establishing the clinical phenotype is essential for recognizing underlying hypercoagulable states.
2
Interpret the laboratory findings.
A prolonged PTT that fails to correct with a mixing study indicates the presence of an inhibitor, specifically a lupus anticoagulant, confirming the diagnosis of antiphospholipid syndrome (APS).
Mixing studies differentiate between factor deficiencies (which correct) and inhibitors (which do not correct).
3
Select the appropriate pharmacologic intervention.
Warfarin, bridged with low-molecular-weight heparin, is selected over direct oral anticoagulants.
Direct oral anticoagulants have been shown to have higher rates of recurrent thrombosis in patients with APS and are currently contraindicated in this population.

Key Concept

Patients with antiphospholipid syndrome who experience a thromboembolic event require long-term anticoagulation with warfarin; direct oral anticoagulants (DOACs) are contraindicated due to a higher risk of recurrent thrombosis.
Question 203Question →

A 67-year-old retired accountant is evaluated during a routine outpatient visit for poorly controlled blood pressure. He reports no chest pain, palpitations, or focal neurological deficits, but notes a recent emergency department admission for sudden-onset severe shortness of breath, which was treated as 'fluid in the lungs.' His medical history is significant for type 2 diabetes mellitus, hyperlipidemia, and peripheral arterial disease. Current medications include amlodipine, lisinopril, and metoprolol at maximal tolerated doses. His blood pressure is 178/104 mmHg178/104 \text{ mmHg}, and his heart rate is 76 /min76 \text{ /min}. Physical examination reveals a distinct systolic-diastolic bruit localized to the right upper abdominal quadrant.

Recent laboratory studies demonstrate:
TestResult
Serum sodium138 mEq/L138 \text{ mEq/L}
Serum potassium3.1 mEq/L3.1 \text{ mEq/L}
Serum creatinine2.7 mg/dL2.7 \text{ mg/dL} (baseline: 1.2 mg/dL1.2 \text{ mg/dL} six months prior)
Estimated GFR24 mL/min/1.73 m224 \text{ mL/min/1.73 m}^2

Which of the following is the most appropriate next step in the diagnostic evaluation of this patient's hypertension?

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Answer: Renal duplex ultrasonography

Answer

Renal duplex ultrasonography
The patient's clinical presentation—resistant hypertension, an episode of flash pulmonary edema, a right-sided abdominal bruit, and a significant rise in serum creatinine following the initiation of an ACE inhibitor (lisinopril)—is highly indicative of renovascular hypertension secondary to renal artery stenosis (RAS). The initial diagnostic workup for suspected RAS requires non-invasive imaging. While renal duplex ultrasonography, computed tomography angiography (CTA), and magnetic resonance angiography (MRA) are all acceptable first-line options in patients with normal renal function, this patient's severe chronic kidney disease (eGFR of 24 mL/min/1.73 m224 \text{ mL/min/1.73 m}^2) significantly restricts these choices. Iodinated contrast used in CTA poses an unacceptable risk of contrast-induced nephropathy, and gadolinium-based contrast agents used in MRA are contraindicated in patients with an eGFR <30 mL/min/1.73 m2< 30 \text{ mL/min/1.73 m}^2 due to the high risk of nephrogenic systemic fibrosis. Therefore, renal duplex ultrasonography, which is non-invasive and does not require nephrotoxic contrast agents, is the safest and most appropriate next step in establishing the diagnosis.

Step-by-Step Solution

1
Analyze the patient's clinical presentation and laboratory findings.
The combination of resistant hypertension, an episode of flash pulmonary edema, an abdominal bruit, hypokalemia, and a significant rise in creatinine following ACE inhibitor initiation points strongly to renal artery stenosis (RAS).
Identifying the underlying clinical syndrome is required to determine the appropriate diagnostic pathway.
2
Determine the standard initial non-invasive imaging options for suspected RAS.
Standard initial tests include renal duplex ultrasonography, computed tomography angiography (CTA), and magnetic resonance angiography (MRA).
Screening for RAS requires demonstrating vascular narrowing or flow abnormalities before pursuing invasive confirmation.
3
Evaluate patient-specific constraints against each imaging modality.
The patient has stage 4 chronic kidney disease (eGFR 24 mL/min/1.73 m224 \text{ mL/min/1.73 m}^2). This severely restricts contrast use. CTA is contraindicated due to the high risk of contrast-induced nephropathy, and gadolinium-enhanced MRA is contraindicated due to the risk of nephrogenic systemic fibrosis.
Diagnostic test sequencing must prioritize patient safety by recognizing absolute and relative contraindications related to patient comorbidities.
4
Select the safest, most appropriate initial test from the remaining options.
Renal duplex ultrasonography is selected as the next best step.
It provides necessary diagnostic evaluation of the renal arteries without exposing the patient to nephrotoxic or fibrosing agents.

Key Concept

In patients with suspected renal artery stenosis and severe chronic kidney disease (eGFR <30 mL/min/1.73 m2< 30 \text{ mL/min/1.73 m}^2), renal duplex ultrasonography is the most appropriate initial diagnostic test because CTA and gadolinium-enhanced MRA carry high risks of contrast-induced nephropathy and nephrogenic systemic fibrosis, respectively.
Estimated Time:2m 0s
Question 204Question →

A 62-year-old man is evaluated in the preoperative clinic prior to an elective right total knee arthroplasty for severe osteoarthritis. He has no other medical conditions, and his only medication is as-needed acetaminophen for joint pain. His vital signs are within normal limits, and a recent basic laboratory evaluation, including a complete blood count and metabolic panel, is unremarkable. The surgical team is finalizing his standardized care pathway. Which of the following interventions are essential components of his perioperative management? (Select all that apply)

Select all that apply

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Answer: Administration of prophylactic intravenous cefazolin within 60 minutes prior to the surgical incision; Initiation of postoperative pharmacologic venous thromboembolism prophylaxis with an agent such as low-molecular-weight heparin

Answer

The essential perioperative interventions are the administration of prophylactic intravenous antibiotics within 60 minutes prior to surgical incision and the initiation of postoperative pharmacologic venous thromboembolism prophylaxis.
For major elective orthopedic surgeries involving implanted hardware, two of the most critical, evidence-based perioperative interventions are the prevention of surgical site infections and deep vein thromboses. Administering a prophylactic intravenous antibiotic (such as cefazolin) within 60 minutes prior to the surgical incision ensures that tissue concentrations are actively bactericidal at the moment the skin barrier is broken. Furthermore, total joint replacements are categorized as highest-risk procedures for venous thromboembolism. Therefore, current guidelines mandate the initiation of postoperative pharmacologic VTE prophylaxis (e.g., low-molecular-weight heparin, direct oral anticoagulants, or sometimes carefully monitored aspirin protocols) in conjunction with mechanical prophylaxis.

Step-by-Step Solution

1
Identify the clinical scenario.
A healthy 62-year-old male undergoing major elective orthopedic surgery (total knee arthroplasty).
Establishing the baseline health status and procedure type dictates the standard-of-care perioperative protocols.
2
Determine surgical site infection (SSI) risk mitigation.
Identify the need for prophylactic intravenous antibiotics (e.g., a first-generation cephalosporin) administered within 60 minutes before the skin incision.
This is a universal core quality measure to prevent perioperative infections in orthopedic implant surgeries.
3
Determine venous thromboembolism (VTE) risk mitigation.
Recognize that total knee arthroplasty poses a high VTE risk, requiring postoperative pharmacologic prophylaxis.
Mechanical prophylaxis alone is insufficient for major lower extremity joint replacements; pharmacologic agents like low-molecular-weight heparin or direct oral anticoagulants are standard.
4
Evaluate the remaining options for appropriateness.
Rule out preoperative MRI, reactive (delayed) fluid management, and preoperative therapeutic anticoagulation as incorrect or dangerous practices.
These represent unnecessary imaging, delayed stabilization, and severe pharmacologic contraindications, respectively.

Key Concept

Standard perioperative management for major orthopedic procedures requires timely prophylactic antibiotic administration (within 60 minutes prior to incision) and robust postoperative pharmacologic venous thromboembolism prophylaxis.
Question 205Question →

A 64-year-old woman is evaluated in the emergency department for severe dizziness and a rapidly spreading rash. Thirty minutes ago, she was given a dose of intravenous ampicillin-sulbactam for a suspected soft tissue infection of her forearm. Shortly after the infusion, she developed diffuse pruritus, a sensation of throat fullness, and profound lightheadedness. Her past medical history is significant for essential hypertension, diet-controlled type 2 diabetes mellitus, open-angle glaucoma, and migraine headaches. Her daily medications include lisinopril, topical timolol ophthalmic drops, and as-needed sumatriptan.

On arrival, her blood pressure is 65/38 mmHg, heart rate is 46/min, respiratory rate is 24/min, and oxygen saturation is 94% on room air. Physical examination reveals an agitated and flushed woman with diffuse urticaria over her trunk and extremities. Lung auscultation reveals mild, scattered expiratory wheezes bilaterally with good air movement. There is no stridor, and her oropharynx is clear without visible angioedema.

Nursing staff immediately place two large-bore intravenous lines and initiate a rapid infusion of normal saline. The physician promptly administers 0.5 mg of intramuscular epinephrine into the anterolateral thigh. Five minutes later, the patient's blood pressure is 60/35 mmHg and her heart rate is 44/min. A second dose of intramuscular epinephrine is administered, but her hemodynamic status remains unimproved after another five minutes.

Which of the following is the single most urgent initial step in the ongoing stabilization of this patient?

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Answer: Intravenous administration of glucagon

Answer

The correct answer is intravenous administration of glucagon.
The correct answer is the intravenous administration of glucagon. This patient is experiencing anaphylactic shock triggered by ampicillin-sulbactam. Despite receiving fluids and two doses of epinephrine, she remains in profound shock with paradoxical bradycardia. This presentation is classic for anaphylaxis in a patient with systemic beta-blockade. Timolol ophthalmic drops, used for glaucoma, drain into the nasolacrimal duct and are absorbed directly into the systemic circulation, bypassing first-pass hepatic metabolism and causing significant non-selective beta-blockade. Because her beta-receptors are blocked, epinephrine cannot induce the necessary chronotropic, inotropic, or bronchodilatory effects. Glucagon is the antidote of choice in this scenario because it binds to distinct glucagon receptors on the myocardium, directly stimulating adenylate cyclase to produce cyclic AMP (cAMP) independently of the beta-adrenergic receptor, thereby restoring cardiac output and stabilizing the patient.

Step-by-Step Solution

1
Diagnose the primary acute condition.
The patient has anaphylactic shock, evidenced by sudden hypotension, urticaria, and wheezing shortly after receiving an intravenous antibiotic.
Recognizing the distributive shock state sets the foundation for standard resuscitation algorithms.
2
Analyze the response to standard initial therapy.
The patient has refractory shock and paradoxical bradycardia (HR 44-46/min) despite receiving two appropriate doses of intramuscular epinephrine and intravenous fluids.
Anaphylactic shock typically presents with compensatory tachycardia. Bradycardia in this setting suggests an underlying medication effect interfering with the endogenous and exogenous catecholamine response.
3
Correlate clinical findings with the patient's medication history.
The patient takes topical timolol ophthalmic drops for glaucoma. Systemic absorption via the nasolacrimal duct causes significant systemic beta-blockade.
Beta-blockade prevents epinephrine from binding to beta-1 and beta-2 receptors, severely blunting its chronotropic, inotropic, and bronchodilatory effects, rendering standard anaphylaxis therapy ineffective.
4
Select the appropriate targeted pharmacological rescue therapy.
Intravenous glucagon is selected.
Glucagon acts on distinct myocardial glucagon receptors, directly activating adenylate cyclase to increase intracellular cAMP. This bypasses the blocked beta-receptors, restoring cardiac contractility and heart rate to stabilize hemodynamics.

Key Concept

Patients with systemic beta-blockade (including from ophthalmic drops like timolol) who develop anaphylaxis often present with paradoxical bradycardia and severe hypotension that is refractory to standard epinephrine. The required stabilization step is the administration of intravenous glucagon to bypass the blocked beta-receptors.
Question 206Question →

A 3535-year-old landscaper is brought to the emergency department by coworkers after sustaining a severe injury from a commercial wood chipper. On arrival, he is unresponsive. Blood is forcefully spurting from a deep, jagged laceration on his proximal right thigh. He has pooling of blood and secretions in his posterior oropharynx, and he is making irregular, gasping respiratory efforts. His heart rate is 148148/min, blood pressure is 62/4062/40 mmHg, and oxygen saturation is 84%84\% on room air. Based on current advanced trauma life support principles, arrange the following management steps in the most appropriate chronological order for initial stabilization.

Drag items to arrange them in the correct order

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Answer

The correct sequence prioritizes catastrophic hemorrhage control, followed by airway management, hemodynamic resuscitation, diagnostic adjuncts, and finally definitive surgical care.
The <C>ABCDE paradigm of advanced trauma life support explicitly requires that catastrophic, massive external bleeding (<C>) be controlled immediately upon presentation—typically with a tourniquet or direct pressure—prior to assessing and securing the Airway (A). Once the tourniquet is applied, the airway must be secured due to the patient's unresponsiveness and inability to protect his airway. Following the establishment of a definitive airway and ensuring adequate Breathing (B), Circulation (C) must be resuscitated via a massive transfusion protocol for this patient in Class IV shock. Only after these primary resuscitative measures are underway should diagnostic adjuncts like the FAST exam be performed to check for occult internal bleeding. Finally, the patient is transported to the operating room for definitive surgical management.

Step-by-Step Solution

1
Apply an arterial tourniquet proximal to the right thigh wound.
Immediate cessation of massive external exsanguination.
Modern trauma principles prioritize catastrophic hemorrhage control (<C>) over airway management, as exsanguination from an arterial bleed will cause death faster than an airway compromise.
2
Perform endotracheal intubation with in-line cervical stabilization.
A definitive airway is secured, preventing aspiration and allowing for mechanical ventilation.
Following the <C>ABCDE algorithm, Airway (A) is the next priority for a patient with a Glasgow Coma Scale score less than 88, pooling secretions, and gasping respirations.
3
Initiate a massive transfusion protocol with uncrossmatched blood products.
Restoration of intravascular volume, oxygen-carrying capacity, and coagulation factors.
The patient is in profound Class IV hemorrhagic shock. Circulation (C) must be supported with blood products rather than crystalloids to prevent the lethal triad of trauma.
4
Perform a focused assessment with sonography for trauma (FAST).
Identification or exclusion of concurrent intra-abdominal, pericardial, or pleural hemorrhage.
Diagnostic adjuncts should follow the initiation of primary survey resuscitation to fully delineate the extent of internal injuries before disposition.
5
Transport to the operating room for definitive surgical exploration.
Definitive repair of the vascular injury and any other identified traumatic wounds.
Definitive surgical care is the appropriate disposition once initial stabilization and triage are completed.

Key Concept

In patients with massive, active external bleeding, catastrophic hemorrhage control (<C>) supersedes airway management (A) in the modern trauma resuscitation algorithm (<C>ABCDE).
Question 207Question →

A 66-year-old man visits his physician to review his cardiovascular risk and update his preventive health plan. He has not seen a doctor since his previous provider retired a year ago. He reports feeling well and has no specific complaints. His medical history includes essential hypertension treated with amlodipine and hyperlipidemia treated with atorvastatin. The patient has a 15-pack-year smoking history but quit completely at age 35. He consumes one or two glasses of wine per week. His father died of a myocardial infarction at age 75, and his mother died of breast cancer at age 80. Current vital signs show a blood pressure of 126/78 mm Hg, heart rate of 70/min, and a BMI of 27 kg/m².

A review of his transferred medical records reveals the following:
- A screening colonoscopy at age 62 revealed no polyps or masses.
- A fasting lipid panel and hemoglobin A1c performed 6 months ago were within target ranges.
- He received the 20-valent pneumococcal conjugate vaccine (PCV20) and the recombinant zoster vaccine series at age 65.
- He received an updated seasonal high-dose influenza vaccine and an annual COVID-19 vaccine two weeks ago at a local pharmacy.

Which of the following is the most appropriate next step in preventive care for this patient?

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Answer: One-time duplex ultrasonography of the abdomen

Answer

One-time duplex ultrasonography of the abdomen is the correct next step, as the patient meets the criteria of being a man between 65 and 75 years old who has a history of smoking.
The correct action is one-time duplex ultrasonography of the abdomen. The United States Preventive Services Task Force (USPSTF) recommends a one-time screening for abdominal aortic aneurysm (AAA) with ultrasonography in men aged 65 to 75 years who have ever smoked. 'Ever smoked' is defined as having smoked at least 100 cigarettes in a lifetime. This 66-year-old patient has a 15-pack-year smoking history, clearly meeting the threshold for this Grade B recommendation.

Step-by-Step Solution

1
Evaluate the patient's demographics and smoking history against abdominal aortic aneurysm (AAA) screening criteria.
The patient is a 66-year-old male who has a history of smoking (15 pack-years).
The USPSTF recommends a one-time screening for AAA with ultrasonography in men aged 65 to 75 years who have ever smoked (defined as at least 100 cigarettes in a lifetime).
2
Assess eligibility for lung cancer screening with low-dose computed tomography (LDCT).
The patient does not meet the criteria for LDCT.
Lung cancer screening is indicated for adults aged 50 to 80 with a 20 pack-year smoking history who currently smoke or have quit within the past 15 years. This patient has only 15 pack-years and quit 31 years ago.
3
Review the patient's immunization record for age-appropriate vaccines.
The patient is up to date on pneumococcal, zoster, influenza, and COVID-19 vaccines.
For adults 65 and older, a single dose of PCV20 completes the pneumococcal vaccination series. PPSV23 is only required if PCV15 was administered instead.
4
Verify current status for colorectal cancer and osteoporosis screening.
Colorectal screening is up to date; osteoporosis screening is not indicated.
A normal colonoscopy provides a 10-year screening interval (due at age 72). Routine DEXA screening is indicated for women 65 and older, but not for average-risk men.

Key Concept

Application of age- and risk-stratified preventive screening and vaccination guidelines in older adults.
Question 208Question →

A 66-year-old woman visits her primary care physician for a comprehensive health evaluation. She feels well and reports no new symptoms. Her past medical history is notable for well-controlled hypothyroidism. Socially, she consumed one pack of cigarettes daily from age 18 to 48 but has strictly abstained from smoking for the past 18 years. Her mother was diagnosed with breast cancer at age 72. A review of her preventive health records reveals a completely normal screening colonoscopy at age 61, a normal bone dual-energy x-ray absorptiometry scan at age 65, and a normal screening mammogram at age 64. Her most recent cervical Papanicolaou smear with human papillomavirus co-testing was performed at age 64 and was negative; records confirm consistently negative cervical screening results over the preceding twenty years. She received a tetanus, diphtheria, and acellular pertussis (Tdap) booster three years ago and completed the recombinant zoster vaccine two-dose series at age 50. She has never received a pneumococcal vaccination. During the visit, she expresses anxiety regarding a friend's recent lung cancer diagnosis and asks, "Can we please do a CT scan of my lungs today to make sure they are clear?" Which of the following is the most appropriate preventive care plan for this patient?

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Answer: Advise against low-dose chest computed tomography, order a screening mammogram, and administer the 20-valent pneumococcal conjugate vaccine

Answer

Advise against low-dose chest computed tomography, order a screening mammogram, and administer the 20-valent pneumococcal conjugate vaccine.
The correct preventive care plan addresses the patient's age and specific history by synthesizing multiple guidelines. First, her request for lung cancer screening with low-dose chest computed tomography (LDCT) must be denied; while she has a 30 pack-year history, she quit 18 years ago, exceeding the 15-year cessation limit established by the USPSTF. Second, she requires a screening mammogram because women aged 40 to 74 are recommended to undergo biennial screening, and her last mammogram was exactly two years ago at age 64. Finally, she requires a pneumococcal vaccination, as the ACIP recommends all adults aged 65 and older receive it (e.g., PCV20), and she has never received one.

Step-by-Step Solution

1
Evaluate the patient's request for lung cancer screening.
Determine that low-dose computed tomography (LDCT) is not indicated.
Although the patient meets the age (50-80 years) and smoking history (≥20 pack-years) criteria, she quit smoking 18 years ago. The USPSTF explicitly recommends discontinuing LDCT screening once a person has not smoked for 15 years.
2
Assess the need for breast cancer screening.
Determine that a screening mammogram is due.
The USPSTF recommends biennial screening mammography for women aged 40 to 74. The patient is 66 and her last mammogram was 2 years ago (at age 64).
3
Review the patient's vaccination history against age-based guidelines.
Identify the need for pneumococcal vaccination.
The Advisory Committee on Immunization Practices (ACIP) recommends pneumococcal vaccination (e.g., a single dose of PCV20) for all adults aged 65 and older. The patient is 66 and vaccine-naive for pneumococcus.
4
Verify if any other routine screenings are due.
Determine that cervical and colorectal cancer screenings are up to date and/or no longer indicated.
Cervical cancer screening is discontinued at age 65 for women with adequate prior negative screening. Colorectal screening was normal at age 61 and is not due again until age 71 (10-year interval).

Key Concept

Application of age-specific cutoffs and intervals for multiple concurrent preventive care guidelines (USPSTF and ACIP).
Question 209Question →

A 34-year-old man is brought to the emergency department by paramedics due to continuous seizure activity. According to his partner, he began having a generalized tonic-clonic seizure 20 minutes ago and has not regained consciousness. He has a history of epilepsy but has been noncompliant with his medications recently. On arrival, he is actively seizing with rhythmic jerking of all four extremities. His temperature is 37.6°C (99.7°F), blood pressure is 145/90 mm Hg, pulse is 122/min, and respiratory rate is 24/min. Oxygen saturation is 91% on room air. A rapid blood glucose check shows 98 mg/dL. Intravenous access is rapidly established by the nursing staff.

Arrange the following management steps in the most appropriate chronological sequence for the initial stabilization and treatment of this patient, assuming the seizure activity remains refractory to each successive intervention.

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Answer

The correct chronological sequence is: 1) Initiate supportive care (ABCs), 2) Administer intravenous lorazepam, 3) Administer intravenous fosphenytoin, 4) Perform endotracheal intubation and initiate continuous propofol.
The algorithm for status epilepticus is strictly time-based. The stabilization phase (0-5 minutes) focuses on basic life support (ABCs), including lateral positioning and oxygenation. The initial therapy phase (5-20 minutes) uses rapid-acting benzodiazepines, such as intravenous lorazepam, to terminate the seizure. The second-line therapy phase (20-40 minutes) utilizes longer-acting agents like fosphenytoin for sustained control if benzodiazepines fail. Finally, the third-line phase (>40 minutes) for refractory status epilepticus involves definitive airway control via intubation and continuous anesthetic infusions like propofol.

Step-by-Step Solution

1
Stabilize the airway and breathing.
The patient is placed in a lateral decubitus position and given supplemental oxygen.
During the first 5 minutes (Stabilization Phase), addressing the ABCs is critical to prevent hypoxia, aspiration, and traumatic injury before initiating pharmacologic therapy.
2
Initiate first-line abortive therapy.
Intravenous lorazepam is administered.
If the seizure persists beyond 5 minutes (Initial Therapy Phase), a rapid-acting benzodiazepine is given to enhance GABAergic inhibition and immediately terminate the seizure.
3
Administer second-line anti-seizure medication.
A loading dose of intravenous fosphenytoin is given.
If the seizure continues despite benzodiazepine administration (Second-line Therapy Phase, 20-40 minutes), a longer-acting agent is necessary to achieve definitive seizure control.
4
Escalate to general anesthesia for refractory status epilepticus.
The patient is intubated and a propofol infusion is started.
Seizures lasting beyond 40 minutes despite initial and second-line therapies require continuous anesthetic infusions to suppress cortical activity, necessitating definitive airway protection.

Key Concept

The management of status epilepticus follows a strict time-based algorithm: stabilization (ABCs) at 0-5 minutes, initial therapy (benzodiazepines) at 5-20 minutes, second-line therapy (e.g., fosphenytoin) at 20-40 minutes, and third-line therapy (anesthetics and intubation) beyond 40 minutes.
Estimated Time:1m 30s
Question 210Question →

A 6161-year-old man comes to the primary care clinic reporting a 4-day history of productive cough, subjective fevers, and worsening shortness of breath. He has a past medical history of type 2 diabetes mellitus, opioid use disorder currently managed with maintenance methadone therapy, and major depressive disorder. His other medications include metformin and citalopram. He has no known drug allergies.

Vital signs show a temperature of 38.3∘C38.3^\circ\text{C} (100.9∘F100.9^\circ\text{F}), heart rate of 94/min94/\text{min}, blood pressure of 126/82 mm Hg126/82\text{ mm Hg}, respiratory rate of 20/min20/\text{min}, and oxygen saturation of 95%95\% on room air. Physical examination reveals bronchial breath sounds and crackles over the left lower lung field.

Laboratory evaluation shows a leukocyte count of 12,500/mm312,500/\text{mm}^3. A comprehensive metabolic panel is within normal limits. A chest radiograph demonstrates a left lower lobe consolidation. An electrocardiogram obtained in the clinic shows normal sinus rhythm with a QTc interval of 520 ms520\text{ ms}.

Which of the following is the most appropriate empiric pharmacologic intervention for this patient?

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Answer: Amoxicillin-clavulanate and doxycycline

Answer

Amoxicillin-clavulanate and doxycycline is the most appropriate empiric pharmacologic intervention because it provides the necessary antimicrobial coverage without exacerbating the patient's dangerously prolonged QT interval.
The correct answer provides an optimal empiric antibiotic regimen for community-acquired pneumonia (CAP) in a patient with comorbidities, while safely navigating a critical pharmacologic constraint. The patient requires outpatient treatment for CAP, and current IDSA/ATS guidelines recommend combination therapy with a beta-lactam and a macrolide or doxycycline, or monotherapy with a respiratory fluoroquinolone. However, this patient has a significantly prolonged baseline QTc interval (520 ms520\text{ ms}) and is taking multiple QT-prolonging medications (methadone, citalopram). Therefore, macrolides and fluoroquinolones are strictly contraindicated due to the high risk of precipitating Torsades de Pointes. Doxycycline provides the necessary coverage for atypical pathogens without affecting the QT interval, making the combination of amoxicillin-clavulanate and doxycycline the safest and most effective choice.

Step-by-Step Solution

1
Determine the diagnosis, severity, and appropriate treatment setting for the patient.
The patient has community-acquired pneumonia (CAP) suitable for outpatient management (CURB-65 score of 0).
To establish the baseline treatment algorithm before adjusting for patient-specific factors.
2
Identify the recommended empiric antibiotic regimens for outpatient CAP in a patient with significant comorbidities.
Guidelines recommend combination therapy with a beta-lactam plus either a macrolide or doxycycline, OR monotherapy with a respiratory fluoroquinolone.
Patients with comorbidities (such as type 2 diabetes mellitus) have a higher risk of adverse outcomes and require broader empiric coverage, including activity against atypical pathogens.
3
Evaluate the patient's safety profile and current medication list for absolute or relative contraindications.
The patient has a dangerously prolonged QTc interval (520 ms520\text{ ms}) caused by the concurrent use of methadone and citalopram.
To avoid prescribing standard-of-care medications that could precipitate life-threatening adverse events, such as Torsades de Pointes.
4
Select the antimicrobial regimen that fulfills coverage requirements without prolonging cardiac repolarization.
Amoxicillin-clavulanate and doxycycline is selected.
Beta-lactams and doxycycline do not significantly affect the QT interval, whereas macrolides (azithromycin) and fluoroquinolones (levofloxacin) are contraindicated in this setting.

Key Concept

The management of community-acquired pneumonia in patients with baseline QT prolongation requires avoiding macrolides and fluoroquinolones; a beta-lactam combined with doxycycline is the preferred safe regimen.
Estimated Time:1m 30s
Question 211Question →

A 5252-year-old female presents to the emergency department with a two-day history of intermittent, severe right upper quadrant abdominal pain that radiates to her right shoulder. She also reports nausea and multiple episodes of non-bilious vomiting. On physical examination, her temperature is 37.1∘37.1^\circ C (98.8∘98.8^\circ F), blood pressure is 128/82128/82 mmHg, heart rate is 8888/min, and respiratory rate is 1414/min. She has scleral icterus and localized tenderness to palpation in the right upper quadrant without rebound or guarding. Laboratory studies reveal:

White blood cell count: 8,5008,500/mm 3^3
Total bilirubin: 2.62.6 mg/dL
Direct bilirubin: 1.91.9 mg/dL
Aspartate aminotransferase (AST): 190190 U/L
Alanine aminotransferase (ALT): 215215 U/L
Alkaline phosphatase: 410410 U/L

A transabdominal ultrasound demonstrates cholelithiasis and a common bile duct measuring 1010 mm in diameter. No echogenic shadowing structures are visualized within the common bile duct. Which of the following is the most appropriate next step in the diagnostic workup of this patient?

Show answer & explanation

Answer: Magnetic resonance cholangiopancreatography

Answer

Magnetic resonance cholangiopancreatography is the most appropriate next step for a patient with intermediate risk of choledocholithiasis.
The correct sequence for working up suspected choledocholithiasis depends on risk stratification. This patient has an intermediate risk for a common bile duct stone, defined by the presence of abnormal liver biochemical tests and a dilated common bile duct (>6>6 mm) on ultrasound, without high-risk features. High-risk features include a visualized CBD stone on ultrasound, clinical ascending cholangitis, or a total bilirubin >4.0>4.0 mg/dL. According to ASGE guidelines, intermediate-risk patients should undergo non-invasive confirmatory imaging with Magnetic resonance cholangiopancreatography (MRCP) or Endoscopic Ultrasound (EUS) to confirm the presence of a stone before subjecting the patient to the risks of an invasive therapeutic procedure.

Step-by-Step Solution

1
Analyze the clinical presentation and laboratory profile.
The patient presents with biliary colic, scleral icterus, and a cholestatic pattern on liver function tests (predominantly elevated alkaline phosphatase and direct bilirubin).
Identifying the pattern of liver injury helps localize the pathology to the biliary tree rather than primary hepatocellular injury.
2
Evaluate the ultrasound findings.
Transabdominal ultrasound shows cholelithiasis and a dilated common bile duct (10 mm), but no visible stone within the duct.
Ultrasound is the best initial test but has lower sensitivity for visualizing common bile duct stones due to bowel gas interference.
3
Stratify the risk of choledocholithiasis based on clinical guidelines.
The patient falls into the 'intermediate risk' category because she has abnormal liver chemistries and a dilated CBD, but lacks high-risk predictors (bilirubin > 4.0 mg/dL, clinical cholangitis, or a visualized CBD stone).
Risk stratification dictates the sequencing of subsequent diagnostic testing versus therapeutic intervention.
4
Determine the appropriate diagnostic modality.
Magnetic resonance cholangiopancreatography (MRCP) or Endoscopic Ultrasound (EUS) is indicated.
Intermediate-risk patients require non-invasive or minimally invasive confirmation of a stone before undergoing therapeutic, higher-risk procedures like ERCP.

Key Concept

Patients with intermediate risk for choledocholithiasis (abnormal LFTs, dilated CBD on ultrasound, but bilirubin < 4.0 mg/dL and no visible CBD stone) require confirmatory non-invasive testing with Magnetic Resonance Cholangiopancreatography (MRCP) or Endoscopic Ultrasound (EUS) prior to invasive intervention.
Question 212Question →

Match each patient presentation to the most appropriate next step in their diagnostic evaluation based on established clinical guidelines for esophageal and swallowing disorders.

Click a left item, then click its matching right item

Items

52-year-old man with progressive dysphagia to solid foods, 10-kg (22-lb) weight loss, and a 30-pack-year smoking history.
35-year-old woman with dysphagia to both solids and liquids, regurgitation, and a barium esophagram showing distal esophageal tapering.
78-year-old man with a history of stroke who experiences coughing and choking immediately upon attempting to swallow liquids.
45-year-old woman with persistent heartburn refractory to an 8-week trial of twice-daily proton pump inhibitors; recent endoscopy is normal.

Matches

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Answer

Patients should be matched to diagnostic studies based on the localization of their symptoms (oropharyngeal vs. esophageal) and the differentiation between structural lesions, motility disorders, and refractory functional conditions.
Appropriate test sequencing relies on characterizing the dysphagia. Oropharyngeal symptoms require dynamic imaging (modified barium swallow). Esophageal symptoms with alarm signs require direct visualization (EGD). Esophageal motility symptoms require pressure analysis (manometry). Refractory reflux without structural damage requires functional acid quantification (pH monitoring).

Step-by-Step Solution

1
Differentiate oropharyngeal from esophageal dysphagia.
Coughing and choking immediately upon swallowing indicates an oropharyngeal etiology (requiring modified barium swallow), whereas the sensation of food getting stuck in the chest points to an esophageal etiology.
Oropharyngeal dysphagia is primarily a neuromuscular coordination issue, whereas esophageal dysphagia involves the esophageal body or lower sphincter.
2
Categorize esophageal dysphagia based on the type of food causing difficulty.
Difficulty with solids only suggests a mechanical/structural lesion, while difficulty with both solids and liquids suggests a neuromuscular motility disorder.
Liquids can easily bypass partial mechanical obstructions but fail to pass when the esophagus loses its peristaltic function or sphincter relaxation.
3
Identify alarm symptoms indicating malignancy.
The presence of significant weight loss and smoking history in the context of solid-food dysphagia prioritizes direct visualization and biopsy via EGD.
Malignant strictures must be ruled out immediately before pursuing functional studies.
4
Select appropriate functional testing for non-obstructive or refractory symptoms.
Manometry is chosen to confirm achalasia suspected on barium swallow, and pH monitoring is chosen for refractory GERD symptoms with normal anatomy.
Functional studies precisely characterize the physiologic abnormality when structural evaluation is unremarkable.

Key Concept

Diagnostic algorithm for evaluating dysphagia and esophageal disorders.
Estimated Time:1m 30s
Question 213Question →

Match each clinical patient presentation following an acute hospitalization with the most appropriate post-acute care disposition setting based on medical necessity and rehabilitation tolerance.

Click a left item, then click its matching right item

Items

A 68-year-old with dense hemiparesis and aphasia from a recent stroke, previously highly functional, who demonstrates the ability to participate in three hours of combined daily physical and speech therapies.
A 62-year-old who survived severe acute respiratory distress syndrome, now status-post tracheostomy and gastrostomy tube placement, requiring ongoing active mechanical ventilator weaning and daily physician management.
An 85-year-old recovering from severe sepsis, who has generalized deconditioning, requires assistance with all transfers, and becomes physically exhausted after 20 minutes of mild activity.
A 59-year-old treated for decompensated heart failure, now hemodynamically stable and euvolemic, who is homebound but requires intermittent skilled nursing for volume status monitoring.

Matches

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Answer

The stroke patient capable of 3 hours of therapy matches to the Inpatient Rehabilitation Facility (IRF). The ventilator-dependent patient matches to the Long-Term Acute Care Hospital (LTACH). The easily fatigued septic patient matches to the Skilled Nursing Facility (SNF). The stable, homebound heart failure patient matches to Home with Home Health Services.
Appropriate disposition depends heavily on the patient's medical complexity, required nursing care, and physical endurance. Patients requiring active, complex medical management like ventilator weaning need a Long-Term Acute Care Hospital (LTACH). Patients who need rehabilitation and can tolerate at least 3 hours of intensive daily therapy qualify for an Inpatient Rehabilitation Facility (IRF). Patients needing rehabilitation who cannot tolerate intense therapy are best suited for a Skilled Nursing Facility (SNF). Stable, homebound patients needing intermittent skilled care should receive Home with Home Health Services.

Step-by-Step Solution

1
Evaluate the rehabilitation tolerance of patients requiring post-acute physical or occupational therapy.
The stroke patient can tolerate 3 hours of daily therapy, meeting IRF criteria. The sepsis patient fatigues at 20 minutes, failing IRF criteria and necessitating SNF placement.
Medicare guidelines strictly require patients to tolerate at least 3 hours of intensive therapy per day to qualify for an Inpatient Rehabilitation Facility.
2
Assess the medical acuity and need for daily physician intervention.
The post-ARDS patient requires active ventilator weaning and complex medical management, fitting LTACH criteria.
LTACHs are designed for patients with complex medical conditions (e.g., prolonged mechanical ventilation, severe wounds) requiring daily physician rounding and hospital-level care for an extended period.
3
Identify patients who are medically stable for a home environment but still need skilled services.
The heart failure patient is stable but needs intermittent nursing to prevent readmission, suitable for Home Health.
Home Health Services require the patient to be homebound and in need of intermittent (not continuous) skilled nursing or therapy.

Key Concept

Selecting the appropriate post-acute care setting requires matching the patient's medical complexity, nursing requirements, and physical endurance for rehabilitation to strict facility admission criteria.
Estimated Time:1m 30s
Question 214Question →

A 46-year-old woman presents to the clinic for a routine wellness examination. Her body mass index is 33 kg/m² and her blood pressure is 138/88 mm Hg. The physician decides to initiate a discussion regarding weight management utilizing the evidence-based "5 A's" behavioral counseling framework. Arrange the following physician statements in the correct sequential order according to this protocol.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence follows the 5 A's framework: Ask permission to discuss weight, Assess habits and readiness, Advise on health benefits, Agree on goals collaboratively, and Assist/Arrange by providing resources and follow-up.
The "5 A's" is an evidence-based behavioral counseling framework widely recommended for obesity management and other lifestyle interventions. The correct chronological sequence begins with 'Ask' (requesting permission to discuss the topic to respect autonomy), followed by 'Assess' (evaluating readiness, habits, and comorbidities). Once the foundation is laid, the physician should 'Advise' (provide personalized medical information and recommendations). After providing advice, the physician and patient 'Agree' (collaboratively setting realistic, measurable goals). Finally, the physician must 'Assist/Arrange' (provide resources, referrals, and schedule follow-up to support sustained change).

Step-by-Step Solution

1
Identify the counseling framework being tested.
The scenario requires the application of the "5 A's" behavioral counseling model (Ask, Assess, Advise, Agree, Assist/Arrange).
This is a standardized, USPSTF-endorsed approach for managing obesity and lifestyle modifications.
2
Map each physician quote to its corresponding step in the framework.
Asking for permission is 'Ask'. Inquiring about habits is 'Assess'. Discussing medical benefits is 'Advise'. Setting a specific behavioral goal is 'Agree'. Providing a referral and scheduling follow-up is 'Assist/Arrange'.
Accurate identification of the communication technique ensures correct sequencing.
3
Order the mapped statements chronologically.
The correct order is Ask -> Assess -> Advise -> Agree -> Assist/Arrange.
This sequence maximizes patient engagement and minimizes resistance to change.

Key Concept

The "5 A's" (Ask, Assess, Advise, Agree, Assist) is an evidence-based behavioral counseling framework used to guide discussions on lifestyle modifications, such as weight management and smoking cessation.
Estimated Time:1m 30s
Question 215Question →

Match each clinical presentation with the most appropriate next step in diagnostic testing.

Click a left item, then click its matching right item

Items

A 42-year-old woman with fever, jaundice, and acute right upper quadrant abdominal pain.
A 70-year-old woman with new-onset localized headache, jaw pain with chewing, and transient vision loss.
A 30-year-old man with sudden-onset 'worst headache of life' and a negative non-contrast head CT scan.
A 55-year-old man with chronic burning epigastric pain, new-onset progressive dysphagia, and recent unintentional weight loss.

Matches

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Answer

1. Jaundice/RUQ pain -> Ultrasound
2. Jaw claudication/vision loss -> ESR
3. 'Worst headache' with negative CT -> Lumbar puncture
4. Dyspepsia with alarm symptoms -> EGD
Each diagnostic test selected represents the standard-of-care initial investigation for the given classic presentation, minimizing unnecessary delays or inappropriate invasive procedures.

Step-by-Step Solution

1
Analyze each clinical presentation to identify the most likely suspected diagnosis.
Patient 1 has suspected cholangitis; Patient 2 has suspected giant cell arteritis; Patient 3 has suspected subarachnoid hemorrhage; Patient 4 has suspected gastric or esophageal malignancy.
Establishing the preliminary diagnosis dictates the algorithmic sequence of testing.
2
Select the guideline-recommended initial or definitive next test based on the suspected diagnosis.
Ultrasound for biliary pathology, ESR for temporal arteritis screening, Lumbar Puncture for CT-negative SAH, and EGD for upper GI alarm symptoms.
Test sequencing prioritizes high-yield, appropriately invasive tests based on pre-test probability and clinical urgency.

Key Concept

Appropriate selection of initial diagnostic testing based on classic clinical presentations.
Question 216Question →

Match each clinical finding regarding the diagnostic evaluation of a newly discovered thyroid nodule with the most appropriate guideline-indicated next step in management.

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Items

Initial evaluation of a palpable 2.5 cm thyroid nodule reveals a markedly suppressed serum thyroid-stimulating hormone (TSH) level.
Neck ultrasound demonstrates a 1.5 cm solid thyroid nodule with microcalcifications in a patient with a normal serum TSH level.
Cytological analysis of a thyroid nodule biopsy returns as atypia of undetermined significance (Bethesda Category III).
Fine-needle aspiration of a dominant thyroid nodule shows benign follicular cells and abundant colloid (Bethesda Category II).

Matches

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Answer

The correct pairings align each clinical scenario with its position in the thyroid nodule diagnostic algorithm: suppressed TSH requires radionuclide scintigraphy; suspicious ultrasound with normal TSH requires FNA biopsy; Bethesda III cytology requires molecular testing or repeat FNA; and Bethesda II cytology requires observation.
The correct pairings successfully navigate the thyroid nodule diagnostic algorithm. A subnormal TSH requires a radionuclide scan to rule out a hyperfunctioning nodule. A normal TSH with suspicious ultrasound features necessitates an FNA biopsy. Based on FNA results, Bethesda III (atypia) requires molecular testing or repeat biopsy to clarify malignancy risk, whereas Bethesda II (benign) requires only routine observation.

Step-by-Step Solution

1
Evaluate the initial TSH level.
If TSH is suppressed, proceed to radionuclide scan. If normal or elevated, proceed to ultrasound evaluation.
Determines if the nodule is autonomously functioning (low malignancy risk) or requires further structural assessment.
2
Evaluate ultrasound findings and size criteria for normal/elevated TSH patients.
Nodules with highly suspicious features (e.g., microcalcifications) greater than 1 cm require an FNA biopsy.
To obtain cytological diagnosis for nodules that carry a significant structural risk for malignancy.
3
Interpret FNA cytology results using the Bethesda classification system.
Bethesda II (benign) warrants observation, while Bethesda III (indeterminate) warrants molecular testing or repeat FNA.
Management is directly dictated by the cytologically determined risk of malignancy.

Key Concept

The diagnostic algorithm for thyroid nodules relies first on TSH measurement, followed by ultrasound and FNA for non-hyperfunctioning nodules meeting size/risk criteria, with subsequent steps guided by Bethesda cytology classifications.
Estimated Time:1m 30s
Question 217Question →

Emergency medical services arrive at the emergency department with a 34-year-old woman experiencing sudden-onset respiratory distress and profound dizziness. The patient's symptoms started abruptly 20 minutes prior, shortly after consuming a meal at a local seafood restaurant. She is extremely anxious, struggling to breathe, and reporting a sensation of her throat closing. She has no known significant past medical history. Vital signs upon arrival are temperature 37.1°C (98.8°F), blood pressure 82/48 mm Hg, pulse 132/min, and respiratory rate 28/min. Oxygen saturation is 90% on room air. Physical examination demonstrates prominent facial angioedema, widespread erythematous urticarial plaques across her trunk, and diffuse expiratory wheezes on lung auscultation. She is speaking in short, fragmented sentences.

Which of the following interventions represent the most appropriate simultaneous initial steps in stabilizing this patient? (Select all that apply)

Select all that apply

Show answer & explanation

Answer: Administer epinephrine intramuscularly into the anterolateral aspect of the thigh; Place large-bore intravenous catheters and infuse a rapid bolus of isotonic crystalloids

Answer

The correct simultaneous interventions are administering intramuscular epinephrine into the anterolateral aspect of the thigh and placing large-bore intravenous catheters to infuse a rapid bolus of isotonic crystalloids.
This patient is presenting with anaphylactic shock, characterized by hypotension, respiratory distress, and mucocutaneous signs following food exposure. The immediate stabilization of anaphylaxis requires a multi-pronged approach targeting the airway and circulation. Intramuscular epinephrine (injected into the anterolateral thigh) is the paramount first-line therapy. It acts on alpha-1 receptors to induce vasoconstriction (increasing blood pressure and reducing mucosal edema) and on beta-2 receptors to induce bronchodilation. Concurrently, because anaphylaxis causes profound vasodilation and increased capillary permeability leading to massive intravascular volume depletion, establishing large-bore intravenous access and rapidly infusing isotonic crystalloids is a critical simultaneous step to restore adequate perfusion.

Step-by-Step Solution

1
Recognize the clinical presentation of anaphylactic shock.
The patient exhibits sudden-onset respiratory distress, angioedema, urticaria, and hypotension (82/48 mm Hg) after a likely allergen exposure.
Identifying the severity of the allergic reaction is crucial for immediate triage and resource allocation.
2
Prioritize initial life-saving interventions (ABCs).
Identify that the patient requires immediate reversal of airway compromise (bronchoconstriction, edema) and cardiovascular collapse (vasodilation, capillary leak).
Anaphylaxis causes rapid decompensation, mandating immediate pharmacologic and hemodynamic support.
3
Select the most appropriate concurrent stabilization orders.
Select intramuscular epinephrine as the primary pharmacologic therapy and rapid intravenous isotonic crystalloids for volume resuscitation.
Epinephrine provides rapid alpha-1, beta-1, and beta-2 adrenergic agonism. Isotonic crystalloids counteract the massive fluid shifts seen in anaphylactic shock.

Key Concept

Immediate stabilization of anaphylactic shock requires simultaneous administration of intramuscular epinephrine and rapid intravenous fluid resuscitation with isotonic crystalloids.
Question 218Question →

Evaluate the following clinical scenarios of patients with suspected pulmonary embolism. What is the most appropriate next step in the diagnostic workup for each patient? Match each clinical presentation to its guideline-indicated diagnostic test.

Click a left item, then click its matching right item

Items

A 28-year-old woman is evaluated for sudden pleuritic chest pain; she is hemodynamically stable, her Wells score is 6.5 (high probability), and she has normal renal function.
A 55-year-old man is assessed in the resuscitation bay for acute severe dyspnea; his blood pressure is 75/45 mm Hg, heart rate is 125/min, and he is deemed too unstable for safe transport.
A 40-year-old woman is seen for atypical chest pain; her Wells score is 1.0 (low probability), heart rate is 88/min, oxygen saturation is 98%, and she has no history of exogenous estrogen use, prior thromboembolism, or recent surgery.
A 71-year-old man is evaluated for acute dyspnea and tachycardia; his Wells score is 5.0 (moderate probability); laboratory results show an estimated glomerular filtration rate (eGFR) of 22 mL/min/1.73 m2, and his chest radiograph is clear.

Matches

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Answer

The correct pairings match each clinical vignette to its guideline-directed diagnostic step based on hemodynamic status, pre-test probability, and contraindications.
The correct pairings strictly align with established clinical guidelines for the diagnostic algorithm of pulmonary embolism, successfully balancing pre-test probability, hemodynamic stability, and patient-specific contraindications to medical imaging.

Step-by-Step Solution

1
Assess hemodynamic stability.
The 55-year-old man is unstable (blood pressure 75/45 mm Hg).
Hemodynamic instability dictates immediate bedside evaluation over transport for definitive imaging.
2
Calculate pre-test probability for the hemodynamically stable patients.
The 28-year-old woman has high probability (Wells 6.5); the 40-year-old woman has low probability (Wells 1.0); the 71-year-old man has moderate probability (Wells 5.0).
Pre-test probability determines if advanced imaging, D-dimer testing, or clinical rule-out is appropriate.
3
Apply rule-out criteria for the low probability patient.
The 40-year-old woman meets all Pulmonary Embolism Rule-Out Criteria (PERC), ruling out pulmonary embolism without further testing.
PERC is designed to safely prevent over-testing in low-risk populations.
4
Evaluate for contraindications to CT pulmonary angiography in moderate or high probability patients.
The 71-year-old man has severe chronic kidney disease (eGFR 22), precluding intravenous contrast. The 28-year-old woman has no contraindications.
Patient-specific factors like renal failure or severe contrast allergy necessitate alternative imaging such as a V/Q scan.

Key Concept

Diagnostic algorithm and test sequencing for suspected pulmonary embolism.
Question 219Question →

A 38-year-old woman is evaluated in the ambulatory clinic for a 6-month history of progressive weight gain, easy bruising, and worsening fatigue. She also reports that her menstrual periods have become irregular. Her blood pressure is 158/96 mmHg. Physical examination reveals central adiposity, facial plethora, a dorsocervical fat pad, and wide, violaceous striae on the lower abdomen. She takes no medications and has no history of exogenous glucocorticoid use. Which of the following is the most appropriate next step in the diagnostic workup?

Show answer & explanation

Answer: Overnight low-dose dexamethasone suppression test

Answer

Overnight low-dose dexamethasone suppression test
The patient presents with classic clinical features of Cushing syndrome. The diagnostic workup for Cushing syndrome must follow a strict sequence to avoid false-positive results. The first step is always to confirm the presence of endogenous hypercortisolism. Acceptable first-line screening tests include an overnight low-dose dexamethasone suppression test, a 24-hour urine free cortisol measurement, or a late-night salivary cortisol test. Only after hypercortisolism is biochemically confirmed should the clinician proceed to determine the etiology.

Step-by-Step Solution

1
Identify the clinical syndrome presented by the patient.
The patient has classical signs of Cushing syndrome, including central obesity, facial plethora, dorsocervical fat pad, and violaceous striae.
Recognizing the constellation of symptoms directs the specific diagnostic algorithm.
2
Determine the first step in the diagnostic sequence for this condition.
The initial step is to establish the presence of endogenous hypercortisolism using a highly sensitive screening test.
Confirmatory testing and localization must wait until the biochemical presence of the disease is established to avoid false positives.
3
Select the appropriate screening test from the available options.
An overnight low-dose dexamethasone suppression test is selected.
This is one of the three standard first-line screening tests for Cushing syndrome.

Key Concept

The initial diagnostic step for suspected Cushing syndrome requires confirming hypercortisolism with a first-line screening test (overnight low-dose dexamethasone suppression test, 24-hour urine free cortisol, or late-night salivary cortisol) before assessing ACTH levels or performing imaging.
Question 220Question →

An ambulance brings a 55-year-old man to the emergency department after he vomited a large volume of bright red blood at his home. The paramedics report that the patient felt dizzy and nearly fainted when they attempted to sit him up. On arrival, he appears pale, diaphoretic, and lethargic. His temperature is 37.0∘C37.0^\circ\text{C} (98.6∘F98.6^\circ\text{F}), blood pressure is 72/42 mmHg72/42\text{ mmHg}, pulse is 138/minute138/\text{minute}, and respiratory rate is 22/minute22/\text{minute}. Pulse oximetry shows 97%97\% on room air. He groans in response to pain but does not answer questions coherently. Which of the following is the most appropriate initial step in the management of this patient?

Show answer & explanation

Answer: Establish two large-bore intravenous lines and initiate fluid resuscitation

Answer

Establish two large-bore intravenous lines and initiate fluid resuscitation
This patient is presenting with a massive upper gastrointestinal hemorrhage leading to hypovolemic (hemorrhagic) shock, as evidenced by his profound hypotension, marked tachycardia, pallor, diaphoresis, and lethargy. In the algorithmic approach to critically ill patients, initial stabilization follows the ABCs (Airway, Breathing, Circulation). While his altered mental status requires close monitoring of his airway, his most immediate, rapidly reversible life threat is cardiovascular collapse from volume loss. The most appropriate initial step is to establish two large-bore intravenous lines (18-gauge or larger) to allow for the rapid, high-volume infusion of isotonic crystalloids and, subsequently, matched or uncrossmatched blood products.

Step-by-Step Solution

1
Assess the patient's hemodynamic status based on vital signs and physical examination.
The patient has a blood pressure of 72/42 mmHg, a pulse of 138/minute, and altered mental status (lethargy).
Identifying the severity of the condition dictates the urgency of intervention.
2
Recognize the clinical syndrome.
The presentation of hematemesis coupled with severe hypotension and tachycardia indicates decompensated hemorrhagic shock.
Determining the type of shock guides the specific stabilization approach.
3
Apply the principles of initial stabilization (ABCs).
The patient's airway is currently maintained (saturating 97% on room air, though altered mental status warrants close monitoring), making 'Circulation' the most pressing and actionable initial priority.
Immediate volume replacement is critical to prevent ischemic organ damage and cardiac arrest.

Key Concept

In patients presenting with acute hemorrhagic shock, immediate hemodynamic stabilization via large-bore intravenous access and fluid resuscitation is the absolute first step, preceding all diagnostic studies and definitive interventions.
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Patient Management Practice Questions — USMLE Step 3 — Page 11 | Examkin