Tüm alıştırma soruları

A 52-year-old woman is evaluated in the emergency department for abrupt, agonizing chest pain that she describes as 'ripping' and radiating to her mid-back. Her pulse is 115/min and blood pressure is 215/115 mm Hg in the right upper extremity and 175/90 mm Hg in the left. A plain chest radiograph demonstrates mediastinal widening. Arrange the following clinical interventions in the most appropriate chronological sequence for optimal management of this patient's suspected pathology.

A 32-year-old man is voluntarily admitted to the inpatient psychiatric unit for the management of a severe major depressive episode. Upon admission, he completes paperwork explicitly opting out of the hospital's patient directory. He tells the admitting physician, 'I do not want anyone to know I am here. Please do not confirm my presence or share any information with anyone who calls, including my family or my boss.' Over the next two days, several individuals and entities request information about the patient. According to standard medical ethics and privacy regulations, to which of the following entities may the hospital staff disclose the patient's protected health information without obtaining his explicit consent? (Select all that apply)

A 65-year-old man is admitted to the hospital for treatment of community-acquired pneumonia. On his second day of admission, he inadvertently receives a 10-fold higher dose of regular insulin than prescribed. The error occurred because the nurse misread the concentration on the vial, which had packaging very similar to a different medication. The patient rapidly develops diaphoresis and tachycardia, and his point-of-care blood glucose level is 42 mg/dL. He is promptly treated with intravenous dextrose and fully recovers without any permanent sequelae. The incident is immediately reported to the hospital's quality and safety committee. Which of the following is the most appropriate next step in managing this event?

A $26$-year-old primigravida presents for her first prenatal visit at $8$ weeks gestation. Her past medical history is unremarkable, and she takes no medications other than a prenatal vitamin. Initial laboratory results indicate she is Rh-positive and nonimmune to rubella. Arrange the following routine preventive screening tests and immunizations in the correct chronological order from her first trimester through her immediate postpartum period.

A 60-year-old woman is evaluated in the surgical intensive care unit following a severe motor vehicle collision. She has sustained a devastating traumatic brain injury and is currently comatose, intubated, and hemodynamically supported. The primary medical team formally determines that she lacks decision-making capacity. Upon reviewing her electronic medical record, the physician finds a legally executed advance directive designating her long-time close friend as her healthcare proxy. Shortly after, the patient's estranged husband, to whom she is still legally married, arrives at the hospital. The designated friend requests the withdrawal of life-sustaining measures, asserting this aligns with the patient's previously expressed values. The husband strongly objects and insists that all aggressive medical interventions continue. Which of the following is the most appropriate action for the physician to take?

Match each patient demographic and clinical risk factor profile to the most appropriate Grade A or B USPSTF screening recommendation.

A pharmacovigilance research group is conducting a retrospective analysis of clinical trials investigating various homeopathic remedies for the treatment of seasonal allergic rhinitis. The researchers identify a total of 140 independent, randomized controlled trials that compared a specific homeopathic intervention to a matching placebo. It is firmly established by comprehensive biochemical analysis that this homeopathic remedy contains only water and is biologically completely inert, meaning it has the exact same true clinical effect as the placebo.

Each of the 140 clinical trials was rigorously designed and executed with a pre-specified significance level ($\alpha$) of 0.05 and a statistical power of 80%.

Based on the principles of hypothesis testing, how many of these 140 trials are expected to report a statistically significant difference in efficacy between the homeopathic remedy and the placebo purely by chance?

A hospital's infectious disease department is reviewing protocols for screening patients for latent tuberculosis prior to initiating tumor necrosis factor-alpha (TNF-$\alpha$) inhibitor therapy. They use an interferon-gamma release assay (IGRA) that measures T-cell reactivity to $M. tuberculosis$ antigens. The standard laboratory cutoff for a positive result is an interferon-gamma concentration of $\geq 0.35$ IU/mL. To minimize the risk of reactivation tuberculosis in this highly vulnerable patient population, the infectious disease committee decides to lower the diagnostic cutoff threshold to $\geq 0.15$ IU/mL for any patient scheduled to start immunosuppressive therapy. Compared to using the standard threshold, which of the following is the most likely consequence of implementing this modified threshold for this specific subgroup?

Match each primary bone tumor with its most characteristic radiographic finding and classic anatomical location.

A gastroenterology research group is evaluating a novel point-of-care salivary assay for celiac disease. During initial clinical validation at a tertiary care celiac referral center, the assay demonstrated a sensitivity of $90\%$ and a specificity of $90\%$. Based on the specific patient population at this referral center, the positive predictive value of the assay was calculated to be $90\%$. Following regulatory approval, a large regional primary care network implements the assay for routine screening of asymptomatic adults. Epidemiological data confirms that the true prevalence of celiac disease in this primary care network is exactly one-fifth ($\frac{1}{5}$) of the prevalence observed at the tertiary care referral center. If a patient in the primary care network receives a positive result on this salivary assay, what is the probability that the patient actually has celiac disease?

A 68-year-old man is admitted to the hospital with acute decompensated heart failure. On his second day of admission, he is prescribed an intravenous diuretic to manage his fluid overload. The attending physician enters an order for furosemide 40 mg IV into the electronic medical record. However, the nurse accidentally administers 40 mg of famotidine IV instead. The error is discovered two hours later during a shift change handoff when the incoming nurse notes the empty famotidine vial in the patient's room. The patient is evaluated and remains hemodynamically stable, although his urine output has not increased as expected. The patient is informed of the error. The hospital's risk management team is notified. Which of the following is the most appropriate next step to prevent this type of error from occurring in the future?

A 68-year-old man is hospitalized for a severe diabetic foot infection complicated by osteomyelitis. The surgical team recommends a below-the-knee amputation within the next few days to prevent systemic spread. The patient is currently experiencing fluctuating confusion and delirium due to the infection and pain medications. He does not have an immediate life-threatening emergency. Arrange the following actions in the most appropriate chronological sequence for ethically and legally securing informed consent for this procedure.

Public health officials are investigating a recent increase in neonatal listeriosis in a specific county. Suspecting a potential link to maternal consumption of unpasteurized soft cheese from a local dairy, the investigators query state health department records to identify 45 cases of neonatal listeriosis diagnosed over the past 24 months. To serve as a comparison group, they randomly select 180 healthy neonates born at the same hospitals during the same 24-month period. Researchers then contact the mothers of all 225 infants to conduct detailed standardized interviews regarding their dietary intake during pregnancy, specifically focusing on the consumption of the suspected soft cheese. Which of the following best describes this epidemiologic study design?

A 38-year-old man is brought to the emergency department after being struck by a motor vehicle while crossing the street. On arrival, he is confused but protecting his airway. His temperature is $36.5^\circ\text{C}$, blood pressure is $78/40\text{ mmHg}$, pulse is $135/\text{min}$, and respiratory rate is $26/\text{min}$. Oxygen saturation is $96\%$ on room air. Primary survey reveals equal and bilateral breath sounds. The abdomen is soft and non-distended. Examination of the pelvis reveals gross instability to anteroposterior compression. There is a large scrotal hematoma and a prominent drop of blood at the urethral meatus. An extended focused assessment with sonography for trauma (E-FAST) reveals no free fluid in the pericardial, pleural, or peritoneal spaces. A pelvic binder is immediately applied, and the patient is resuscitated with 2 liters of isotonic crystalloid and 2 units of uncrossmatched type O-negative packed red blood cells. Re-evaluation 15 minutes later shows a blood pressure of $82/45\text{ mmHg}$ and a pulse of $130/\text{min}$. Which of the following is the most appropriate next step in management?

A 64-year-old man is brought to the emergency department via ambulance due to sudden-onset, excruciating chest pain that he describes as 'ripping' and radiating to his interscapular region. He has a history of poorly controlled hypertension. His temperature is 37.1°C (98.8°F), blood pressure is 215/115 mm Hg in his right arm and 175/95 mm Hg in his left arm, heart rate is 118/min, and oxygen saturation is 96% on room air. Cardiac auscultation reveals a new early diastolic murmur at the right upper sternal border. An intravenous line is established. Arrange the following subsequent steps in the patient's evaluation and management in the most appropriate chronological order.

A $62$-year-old man with a history of chronic obstructive pulmonary disease (COPD) and coronary artery disease is brought to the emergency department during a severe winter snowstorm. His wife found him confused and complaining of a severe, throbbing headache in their unventilated garage, where he had been running a gasoline-powered generator for several hours. On arrival, he is lethargic but arousable. Temperature is $37.1^\circ\text{C}$ ($98.8^\circ\text{F}$), blood pressure is $105/65\text{ mmHg}$, pulse is $115/\text{min}$, and respiratory rate is $24/\text{min}$. Pulse oximetry shows $99\%$ on room air. Physical examination reveals clear lung fields bilaterally and no jugular venous distention. Arterial blood gas analysis on room air shows:

pH: $7.28$
PaCO $_2$: $32\text{ mm Hg}$
PaO $_2$: $95\text{ mm Hg}$
HCO $_3^-$: $14\text{ mEq/L}$

What is the most appropriate next step in the management of this patient?

A 52-year-old woman presents to the emergency department with a 24-hour history of severe, sudden-onset abdominal pain, intractable nausea, and an inability to pass flatus or stool. Her past medical history is significant for systemic lupus erythematosus, for which she takes hydroxychloroquine and low-dose prednisone. She has never undergone abdominal surgery. Vital signs show a temperature of 37.4°C (99.3°F), blood pressure of 118/76 mmHg, and a heart rate of 105/min. Physical examination reveals a markedly asymmetric, distended abdomen with diffuse tympany to percussion. There is moderate tenderness to palpation in the mid-abdomen without rigidity or rebound. Laboratory results, including a complete blood count and basic metabolic panel, are within normal limits. An upright abdominal plain radiograph demonstrates a massively dilated, ectopic large bowel loop originating in the right lower quadrant and projecting toward the left upper quadrant, displaying a 'kidney bean' appearance. A single large air-fluid level is visualized, and there is a paucity of gas in the distal colon. Which of the following is the most appropriate next step in management?

A 35-year-old man comes to the clinic due to a 1-week history of fatigue, nausea, and right-sided abdominal pain. Yesterday, he noticed his eyes were turning yellow. He works as a prep cook at a large catering company. Physical examination shows scleral icterus and right upper quadrant tenderness. Laboratory studies are positive for hepatitis A virus IgM antibodies. The physician informs the patient of the diagnosis and explains the risk of transmission through food handling. The patient states, "I know I should stay home, but I will lose my job if I take time off. Please don't tell anyone about this. I'll just be very careful and wash my hands frequently at work." Which of the following is the most appropriate action by the physician?

Health administrators at a large regional healthcare network evaluate a newly implemented electronic sepsis-alert algorithm. They compare the 30-day mortality rates of patients treated before and after the system's deployment. In a preliminary sample of $80$ patients, mortality was $15\%$ in the pre-intervention group and $12\%$ in the post-intervention group ($p = 0.24$). The administrators conclude the algorithm is ineffective and discontinue its use.

One year later, a national multicenter trial evaluates the exact same algorithm across $40$ hospitals, enrolling $5,000$ patients. This trial demonstrates a statistically significant reduction in mortality from $16\%$ to $11\%$ ($p < 0.01$). Assuming both evaluations were methodologically sound in their execution, which of the following best explains the discrepancy between the regional hospital's internal review and the national trial?

A 64-year-old man presents to the clinic with a 3-week history of a left-sided scrotal mass. He reports a dull, dragging sensation in his scrotum but denies acute pain, dysuria, or fever. His medical history is notable for hypertension and a 40-pack-year smoking history. Physical examination reveals a soft, non-tender, tortuous mass superior to the left testis. The mass does not decompress when the patient assumes a supine position. His abdomen is soft and non-tender. Urinalysis demonstrates 4-5 red blood cells per high-power field. Which of the following is the most appropriate next step in management?