Tüm alıştırma soruları

A 55-year-old man with a two-year history of amyotrophic lateral sclerosis is admitted to the intensive care unit for acute hypercapnic respiratory failure secondary to aspiration pneumonia. He was intubated in the emergency department. Prior to admission, he was wheelchair-dependent but communicated effectively using a speech-generating device. On hospital day three, the patient is awake, alert, and communicating via a letter board. He consistently and clearly requests to be extubated, communicating that he understands this will likely result in his death and that he does not want to live dependent on a machine. His wife, who is his legally designated healthcare proxy, is highly distressed. She demands that the medical team continue mechanical ventilation, stating, 'He is just overwhelmed right now; you cannot let him die.' A formal psychiatric evaluation concludes that the patient does not have major depressive disorder and possesses full decision-making capacity. Which of the following is the most appropriate next step in management?

A 78-year-old man with end-stage ischemic cardiomyopathy (left ventricular ejection fraction 15%) and NYHA class IV heart failure is admitted to an inpatient hospice facility. He has a biventricular pacemaker with an implantable cardioverter-defibrillator (CRT-D) in place. Upon admission, a 'Do Not Resuscitate' order is confirmed. On his second day in the facility, his condition declines; he becomes obtunded and is determined to be in the actively dying phase. Shortly after, he experiences a sustained episode of ventricular tachycardia and receives a high-voltage shock from his CRT-D, causing his body to jolt and resulting in visible physical distress. His wife, who is his legally designated healthcare proxy, is at his bedside. She is terrified by the event and asks the attending physician to 'turn the machine off' to prevent further shocks. However, she expresses fear that doing so will cause him to immediately suffocate. Which of the following is the most appropriate next step in management?

Match each clinical research scenario with the specific type of bias or methodological flaw it best represents.

A randomized, double-blind, placebo-controlled clinical trial evaluates the efficacy and safety of a novel targeted biologic therapy for patients with severe, uncontrolled eosinophilic asthma. A total of 4,000 patients are enrolled and randomized in a 1:1 ratio to receive either the biologic therapy or a placebo over a 52-week period.

The primary efficacy endpoint is the occurrence of a severe asthma exacerbation requiring an emergency department visit or hospitalization. The primary safety endpoint is the occurrence of severe opportunistic infections. The trial results are summarized in the table below:

Based on these results, which of the following represents the number needed to treat (NNT) to prevent one severe asthma exacerbation and the number needed to harm (NNH) to cause one additional severe opportunistic infection, respectively?

A 54-year-old man who recently emigrated from Southeast Asia is evaluated in the clinic for newly diagnosed essential hypertension. During the visit, he expresses reluctance to start taking lisinopril. He states that he prefers to use traditional herbal remedies to "balance the body's internal energies," which he believes are the true cause of his symptoms. The physician decides to utilize the LEARN model of cross-cultural communication to provide effective health counseling and improve medication adherence.

Arrange the following physician actions into the correct chronological sequence according to the LEARN framework for cross-cultural communication.

A public health task force is evaluating a new rapid serologic assay for a tick-borne illness endemic to a specific region. During initial clinical validation at a tertiary care center, the assay was tested on a cohort of $2,000$ individuals, exactly half of whom had PCR-confirmed infection. In this validation cohort, the assay correctly identified $900$ of the infected individuals and yielded a positive result in $25$ of the uninfected individuals.

The task force now plans to deploy this assay to a rural outpatient clinic where epidemiological data indicates that $10\%$ of the tested patients actually have the infection.

If a patient at this rural clinic tests positive using the rapid assay, what is the probability (expressed as a percentage) that they truly have the infection?

During a busy night shift in the pediatric emergency department, an attending physician orders intravenous phenytoin for a 5-year-old boy presenting with status epilepticus. The physician calculates a dose of 20 mg/kg but inadvertently enters the order as 200 mg/kg in the computerized provider order entry (CPOE) system. The clinical pharmacist intercepts the order, recognizes the significant overdose risk, and immediately contacts the physician. The order is corrected before any medication is dispensed, and the child's seizures are successfully managed with the appropriate weight-based dose. Which of the following is the most appropriate next administrative step regarding this event?

Match the following clinical scenarios of terminally ill patients receiving end-of-life care with the most appropriate pharmacologic intervention for their symptoms.

A 45-year-old man with newly diagnosed type 2 diabetes mellitus and a body mass index of $34 \text{ kg/m}^2$ presents for a follow-up visit. The physician intends to use the evidence-based "5 A's" behavioral counseling framework (Assess, Advise, Agree, Assist, Arrange) to initiate weight management counseling. Arrange the following physician statements in the correct chronological sequence according to this framework.

An outpatient internal medicine clinic identifies that only 45% of patients with diabetes mellitus have a documented annual comprehensive foot examination, which is significantly below the national benchmark. The clinic's quality improvement committee decides to utilize the Plan-Do-Study-Act (PDSA) methodology to implement a new electronic health record (EHR) reminder system. Arrange the following actions in the correct chronological sequence to represent a complete, single PDSA cycle.

A 45-year-old woman is evaluated in the emergency department for severe right upper quadrant abdominal pain, nausea, and fever. Her temperature is 39.0°C (102.2°F), heart rate is 112/min, and blood pressure is 105/65 mm Hg. Physical examination reveals scleral icterus and marked tenderness in the right upper quadrant with a positive Murphy sign. Laboratory studies show a leukocyte count of 16,000/mm³ and total bilirubin of 3.2 mg/dL. Right upper quadrant ultrasound demonstrates gallstones, gallbladder wall thickening, and common bile duct dilation to 10 mm. The emergency medicine physician diagnoses acute cholangitis and consults the general surgery resident. After evaluating the patient, the surgery resident states, "She is hemodynamically stable right now. I recommend discharging her with a prescription for oral ciprofloxacin and arranging for her to follow up in our outpatient clinic next week." The emergency medicine physician strongly disagrees, explaining that the patient requires inpatient admission for intravenous antibiotics and likely urgent biliary decompression. The surgery resident reiterates the discharge recommendation and refuses to accept the admission. Which of the following is the most appropriate next step for the emergency medicine physician?

A prospective cohort study is being designed to evaluate the association between heavy coffee consumption and the incidence of pancreatic cancer. The investigators are aware that tobacco smoking is heavily associated with coffee drinking and is a well-established independent risk factor for pancreatic cancer. Therefore, smoking is a significant potential confounder. Which of the following strategies can be used to control for the confounding effect of tobacco smoking in this study? (Select all that apply)

A clinical task force is evaluating various strategies for implementing a new diagnostic enzyme immunoassay. Match each proposed change in test implementation or cutoff threshold to its corresponding predictable impact on the statistical performance parameters of the test.

A primary care physician in an outpatient clinic is reviewing the electronic health record (EHR) of a 45-year-old man who underwent a skin biopsy three weeks ago. The pathology report, which confirmed melanoma in situ, was finalized and transmitted to the clinic two weeks ago. However, the report was automatically routed to the inbox of the ordering physician, who was away on a two-week vacation. Because no cross-coverage was designated in the EHR for inbox management, the result was not reviewed, leading to a delay in patient notification and definitive treatment. The patient has now been contacted, informed of the delay, and urgently referred to surgical oncology. The clinic physician wants to address the workflow issue that led to this delayed follow-up. Which of the following is the most appropriate next step regarding this workflow vulnerability?

An 82-year-old retired teacher is admitted to the medical ward following a severe episode of aspiration pneumonia leading to hypoxemic respiratory failure. He has a 6-year history of Alzheimer disease and has progressively declined; he is now bedbound, nonverbal, and fully dependent for all activities of daily living. This marks his fourth hospital admission for aspiration in the past eight months. He is currently receiving intravenous piperacillin-tazobactam and supplemental oxygen via high-flow nasal cannula.

During a family meeting, his daughter, who presents valid documentation as his legally appointed healthcare proxy, states that her father always valued independence and would never want to be kept alive in this condition. She requests that all life-prolonging treatments be discontinued so he can pass away peacefully. The attending physician evaluates the patient and agrees that the clinical prognosis is grim. The patient is currently resting without signs of acute pain or distress.

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

A physician is seeing several patients in a continuity clinic who are struggling with medication adherence. Each patient presents a distinct belief barrier or challenge affecting their compliance. Match each patient statement describing their barrier (left) to the most appropriate and targeted physician counseling intervention (right).

A 32-year-old man comes to an urgent care clinic in mid-July with a 2-day history of a mild cough and a low-grade fever. The physician considers testing him for a novel respiratory virus. The manufacturer's data for a rapid point-of-care antigen test indicates a sensitivity of $90\%$ and a specificity of $90\%$. Based on current local epidemiological data for patients presenting with similar symptoms during the summer, the estimated prevalence (pretest probability) of this virus is $1\%$. The patient undergoes the rapid test, and the result is positive. Which of the following is closest to the probability that this patient actually has the viral infection?

Researchers at a multi-institutional nephrology consortium are evaluating the efficacy of a novel nonsteroidal mineralocorticoid receptor antagonist in preventing renal failure progression. They enroll a cohort of individuals with type 2 diabetes and advanced chronic kidney disease. The participants are divided equally into an intervention arm and a standard-of-care control arm, with $1,200$ subjects in each cohort. Over a $5$-year longitudinal observation period, the primary outcome of progression to hemodialysis dependence occurs in $180$ patients receiving the intervention and $240$ patients receiving standard care alone. Based on this data, which of the following represents the relative risk reduction (RRR) and the number needed to treat (NNT) to prevent one case of hemodialysis dependence?

A community hospital's maternity unit is revising its massive transfusion protocol for severe postpartum hemorrhage. Before implementing the updated guidelines, a multidisciplinary committee comprising obstetricians, anesthesiologists, nursing staff, and blood bank technicians is assembled. The team diagrams the proposed new workflow and systematically evaluates each step to identify any potential vulnerabilities, such as sample mislabeling or pneumatic tube transport delays. For every identified vulnerability, they estimate the probability of occurrence, the potential severity of patient harm, and the likelihood of detecting the error before harm occurs. They multiply these factors to calculate a risk score that prioritizes which steps require built-in redundancies. Which of the following quality improvement methodologies is this committee employing?

A 61-year-old woman comes to the clinic to discuss the results of a recent dual-energy x-ray absorptiometry (DEXA) scan. The scan reveals a T-score of -2.8 at the lumbar spine and -2.3 at the femoral neck. Her past medical history is significant for an unprovoked deep vein thrombosis 4 years ago, for which she completed a 6-month course of anticoagulation, and gastroesophageal reflux disease. The physician explains the diagnosis of osteoporosis and recommends initiating oral alendronate. The patient becomes visibly anxious and states, "I read an article online about people whose jawbones completely rotted away after taking those pills. I am absolutely terrified of that happening. I refuse to take them and will just manage this with over-the-counter calcium supplements." Which of the following is the most appropriate next step in management?