Tüm alıştırma soruları

A 45-year-old man is evaluated in the emergency department for a 3-week history of low-grade fever, chills, night sweats, and generalized myalgias. He has a known history of a bicuspid aortic valve but has not followed up with a cardiologist in several years. His temperature is 38.4°C (101.1°F), blood pressure is 142/50 mmHg, and heart rate is 98/min. Cardiac auscultation reveals a high-pitched, decrescendo diastolic murmur loudest at the right upper sternal border. The physician highly suspects an infectious process involving the endocardium. Which of the following physical examination findings are classically associated with the suspected diagnosis? (Select all that apply)

An academic medical center is organizing a retrospective cohort investigation to assess the risk of incident chronic kidney disease (CKD) associated with a newly introduced antihypertensive agent compared to standard angiotensin-converting enzyme (ACE) inhibitors. The principal investigator hypothesizes that the novel agent is highly protective against CKD in non-diabetic patients, but paradoxically accelerates renal function decline in patients with pre-existing diabetes mellitus.

To accurately test this specific hypothesis regarding the differential impact of diabetes, which of the following methodological and analytical approaches MUST be integrated into the study design? (Select all that apply)

A 71-year-old man with a history of permanent atrial fibrillation is maintained on a novel oral anticoagulant (NOAC) at a standard daily dose to prevent thromboembolism. The NOAC has a baseline oral bioavailability ($F$) of $30\%$, is a known substrate of intestinal P-glycoprotein (P-gp) efflux pumps, and undergoes extensive hepatic elimination via the cytochrome P450 3A4 (CYP3A4) pathway. The baseline elimination half-life ($t_{1/2}$) of this medication is 10 hours.

The patient is recently diagnosed with a systemic fungal infection and is started on oral itraconazole, a potent dual inhibitor of both P-gp and CYP3A4. Co-administration of itraconazole increases the NOAC's oral bioavailability to $90\%$ and reduces its hepatic clearance ($CL$) by $50\%$.

One week later, the patient presents to the emergency department with severe gastrointestinal hemorrhage and requires urgent resuscitation. Assuming the volume of distribution ($V_d$) remains constant, which of the following accurately describes the pharmacokinetic alterations responsible for this patient's presentation?

A 28-year-old woman is brought to the emergency department by her partner due to a painful, blistering skin rash. She has a history of bipolar I disorder with rapid cycling. For the past year, her psychiatric regimen consisted solely of lamotrigine, but due to poor mood control, her psychiatrist added a second medication 4 weeks ago. Two days ago, the patient developed a fever, malaise, and a sore throat. This morning, a diffuse erythematous maculopapular rash appeared on her face and trunk, which has rapidly progressed to form flaccid blisters with mucosal involvement. A dermatologist is consulted and suspects Stevens-Johnson syndrome. Laboratory studies reveal a significantly supratherapeutic serum lamotrigine concentration. The psychiatric medication added 4 weeks ago most likely increased this patient's risk for her current condition through which of the following pharmacokinetic mechanisms?

Determine the optimal post-acute care setting for each of the described patients based on their current clinical stability, rehabilitation potential, and goals of care.

A 72-year-old man is hospitalized following a massive left middle cerebral artery ischemic stroke. His acute hospital course has stabilized, but he has significant residual right-sided hemiparesis and expressive aphasia. The primary care team is initiating the discharge planning process. His family is highly supportive but expresses uncertainty regarding their ability to provide the necessary level of care at home.

Arrange the following steps of the multidisciplinary disposition and care transition process in the most appropriate chronological order, from first to last.

The selection of a post-acute care environment depends heavily on medical complexity, caregiver availability, and the intensity of rehabilitation therapy a patient can safely tolerate. Match each of the following patient clinical profiles to the most appropriate discharge destination.

A 35-year-old woman presents to the outpatient primary care clinic with a 3-month history of worsening fatigue, a 5-kg (11-lb) weight gain despite no change in her appetite, constipation, and feeling cold all the time. She also reports that her menstrual cycles have become heavier over the past few months. Vital signs show a temperature of 36.5°C (97.7°F), a heart rate of 54/min, a blood pressure of 110/70 mm Hg, and a respiratory rate of 14/min. On physical examination, her skin is cool and dry. The thyroid gland is palpable, firm, and non-tender without distinct nodules. Neurologic examination reveals a delayed relaxation phase of the Achilles tendon reflexes. Which of the following is the most appropriate next step in laboratory evaluation?

A 68-year-old man presents to the clinic with a 1-week history of dark, tarry stools and generalized fatigue. He describes a mild, burning epigastric pain that typically worsens a few hours after eating. His past medical history is significant for osteoarthritis of the knees, hypertension, and hyperlipidemia. His prescribed medications include amlodipine and atorvastatin. His pulse is 98/min, and his blood pressure is 112/74 mm Hg. Physical examination reveals pale conjunctivae and mild epigastric tenderness. Which of the following is the most important targeted question to ask during this patient's medical history evaluation?

Match the following distinctive cardiovascular physical examination findings with their most likely underlying pathophysiological mechanism.

A 45-year-old man with a history of advanced human immunodeficiency virus infection is admitted to the hospital for evaluation of a 4-week history of low-grade fever, drenching night sweats, diffuse abdominal pain, and a 6-kg (13.2-lb) weight loss. He has not been compliant with his antiretroviral therapy. His most recent CD4 T-lymphocyte count is 35 cells/mm³. Laboratory studies show a hemoglobin of 8.2 g/dL and an elevated serum alkaline phosphatase level. Blood cultures obtained using a lysis-centrifugation system grow non-tuberculous acid-fast bacilli. The patient is initiated on a multidrug antimicrobial regimen. Three months later, he returns with recurrent fever, and repeat blood cultures isolate the same pathogen. Susceptibility testing reveals newly acquired high-level resistance to the macrolide component of his regimen. This resistance is most likely mediated by a structural alteration in which of the following cellular targets?

A 54-year-old woman is brought to the emergency department by her husband due to severe weakness, nausea, vomiting, and confusion that began 24 hours ago. The patient returned 5 days ago from a 2-week vacation in Southeast Asia. Her medical history includes severe osteoarthritis of the knees and hypertension. Six months ago, after experiencing refractory joint pain, she began consuming a daily "traditional herbal infusion" imported by a friend. She reported that the infusion provided dramatic pain relief, increased her appetite, and caused a 7-kg (15-lb) weight gain, predominantly in her abdomen. However, her luggage containing the infusion was lost during her return flight, and she has not consumed it for the past 5 days. Her only prescribed medication is amlodipine. She does not smoke or consume alcohol.

Temperature is 38.1°C (100.6°F), blood pressure is 76/40 mm Hg, pulse is 122/min, and respirations are 22/min. Physical examination reveals a lethargic woman with a rounded face and central adiposity but thin extremities. She has no hyperpigmentation of the palmar creases or oral mucosa.

Based on the patient's medical history and current findings, which of the following is the most likely etiology of her hemodynamic collapse?

Evaluation in the outpatient endocrinology clinic is requested for a 31-year-old female due to markedly abnormal thyroid function tests. The patient originally consulted her primary care provider for generalized hair thinning, for which she recently started an over-the-counter hair, skin, and nail megavitamin complex. She currently reports feeling entirely well, specifically denying any palpitations, heat intolerance, unintentional weight changes, anxiety, or tremulousness. Vital signs are temperature 37.0°C (98.6°F), blood pressure 114/72 mm Hg, and pulse 68/min and regular. Physical examination reveals a normal-sized, non-nodular thyroid gland without palpable thrill or audible bruit. There is no evidence of proptosis, lid lag, or pretibial myxedema. Her peripheral reflexes are 2+ and symmetric bilaterally without delay in the relaxation phase.

Recent laboratory studies obtained by her primary provider demonstrate:

Which of the following is the most appropriate next step in laboratory evaluation?

During a routine health maintenance visit, a 32-year-old female patient mentions that she has been feeling unusually sluggish over the past few months. She reports a recent 4-kg (8.8-lb) weight gain, worsening constipation, and a constant feeling of being cold, even during the summer months. She has no chronic medical conditions and takes no prescription medications. Her vital signs show a temperature of 36.4°C (97.5°F), blood pressure of 112/74 mmHg, and a pulse of 54/min. Physical examination reveals noticeably dry skin and a prolonged relaxation phase of the Achilles tendon reflexes. Which of the following is the most appropriate initial diagnostic test to investigate this patient's symptoms?

A 68-year-old man is evaluated for progressive headaches and left-sided weakness over the past month. Magnetic resonance imaging of the brain reveals a 4-cm, ring-enhancing lesion in the right frontal lobe with extensive surrounding edema, characteristic of glioblastoma. The patient undergoes surgical resection. Pathologic examination of the tissue demonstrates pseudo-palisading necrosis and prominent microvascular proliferation. The rapid growth and vascularization of this patient's tumor are primarily driven by a cascade of molecular events initiated by the tumor microenvironment. Arrange the following molecular and cellular events in the correct chronological order to describe the mechanism of tumor-induced angiogenesis in this patient.

A 45-year-old avid cyclist presents to the outpatient neurology clinic complaining of progressive weakness in his right hand and 'pins and needles' tingling in his right ring and small fingers over the past two months. He notes difficulty holding onto small objects and buttoning his shirt. Physical examination reveals wasting of the right hypothenar eminence and weakness in spreading the fingers against resistance. Froment's sign is positive on the right. Deep tendon reflexes in the upper extremity are 2+ and symmetric. The physician suspects an ulnar neuropathy and is utilizing detailed sensory and motor testing to localize the site of compression to either the elbow (cubital tunnel) or the wrist (Guyon's canal). Which of the following specific physical examination findings would definitively localize the patient's nerve entrapment to the elbow rather than the wrist?

An inpatient in their sixties is currently receiving treatment on the medical ward for a severe exacerbation of chronic obstructive pulmonary disease. Their therapeutic regimen includes intravenous methylprednisolone, scheduled bronchodilators, and subcutaneous unfractionated heparin for deep venous thrombosis prophylaxis. Upon admission $6$ days ago, their platelet count was $310,000 \text{ /mm}^3$ and hemoglobin was $14.8 \text{ g/dL}$. Today, the patient reports acute, progressive pain in the left lower extremity. Physical examination demonstrates asymmetric swelling, warmth, and tenderness of the left calf. A bedside compression ultrasonography reveals an acute, non-compressible thrombus in the left popliteal vein. Stat laboratory evaluation shows a current platelet count of $145,000 \text{ /mm}^3$, with a normal prothrombin time and activated partial thromboplastin time. Based on the most likely diagnosis, which of the following is the most appropriate next step in the pharmacologic management of this patient?

An 81-year-old male with persistent atrial fibrillation and nonadherence to anticoagulation therapy arrives at the emergency department. He reports severe, generalized abdominal pain that began abruptly two hours ago. On physical examination, the patient exhibits minimal abdominal tenderness despite his severe subjective pain. His pulse is 115/min and irregularly irregular. A CT angiogram demonstrates a large thromboembolus occluding the proximal superior mesenteric artery. The patient is prepped for emergency laparotomy to resect the affected bowel segment. Arrange the following subcellular biochemical events in the correct chronological order, representing the progressive ischemic injury occurring within the affected intestinal epithelial cells.

A $78$-year-old woman is brought to the emergency department by her neighbor due to cough, fever, and generalized weakness. The neighbor found the patient on the floor of her apartment, stating she had fallen $12$ hours earlier when trying to get to the bathroom and was too weak to get back up. The patient has a $3$-day history of a productive cough. Medical history includes hypertension, osteoporosis, and moderate osteoarthritis of the knees. She lives alone.

On physical examination, temperature is $38.2^\circ\text{C}$ ($100.8^\circ\text{F}$), pulse is $92$/min, blood pressure is $135/85$ mm Hg, and respirations are $20$/min. Pulse oximetry shows $95\%$ on room air. She is alert and oriented to person, place, and time. Lung auscultation reveals crackles in the left lower lobe. There is no evidence of trauma or fracture from the fall, but she exhibits profound generalized weakness. Physical therapy evaluation in the emergency department demonstrates she is currently unable to ambulate and requires moderate assistance from two people to transfer from the bed to a chair.

Laboratory studies show:
Leukocyte count: $11,500/\text{mm}^3$
Blood urea nitrogen: $16$ mg/dL
Serum creatinine: $0.9$ mg/dL

A chest radiograph confirms a left lower lobe consolidation. Intravenous hydration and empiric oral antibiotics are initiated.

Which of the following is the most appropriate initial disposition for this patient?

Match each challenging patient counseling scenario (left) with the most appropriate initial physician communication strategy (right).