Tüm alıştırma soruları

The parents of a $22$-day-old female neonate bring her to the urgent care clinic during the winter due to worsening breathing difficulties. Over the past three days, the infant has had clear nasal discharge and a mild cough, but today she is breathing much faster than usual and tiring quickly while breastfeeding. The mother also expresses concern regarding a facial rash that appeared a week ago. The infant was born full-term with no perinatal complications. Her temperature is $37.3^\circ\text{C}$ ($99.1^\circ\text{F}$), pulse is $165/\text{min}$, respiratory rate is $72/\text{min}$, and oxygen saturation is $94\%$ on room air. Physical examination reveals an alert but tachypneic infant with moderate subcostal retractions and diffuse bilateral expiratory wheezing. Examination of the face reveals multiple erythematous papules and pustules localized to the cheeks and forehead, with an absence of open or closed comedones. Which of the following is the most appropriate next step in the management of this patient?

A clinical investigator is evaluating a newly developed plasma tau biomarker as a screening tool for early-stage Alzheimer disease. The test's performance is initially validated in a specialized memory disorder clinic where the prevalence of the disease is $30\%$. In this setting, the assay demonstrates a sensitivity of $85\%$ and a specificity of $90\%$. The investigator plans to implement the same biomarker test in a general primary care setting, where the prevalence of early-stage Alzheimer disease is estimated to be $2\%$. Assuming the cutoff value for a positive test remains the same, which of the following is the most likely expected change in the test's predictive values in the primary care setting compared to the specialized clinic?

A palliative care consultation is requested for a 68-year-old man who is hospitalized with a malignant small bowel obstruction secondary to widely metastatic pancreatic adenocarcinoma. The patient is currently obtunded, responding only to deep painful stimuli, and lacks decision-making capacity. His medical record contains a legally executed durable power of attorney for healthcare (DPOA-HC) designating his longtime domestic partner as his healthcare surrogate. He also has a living will, signed seven years ago, explicitly stating he would not want artificial nutrition, hydration, or surgical interventions if he developed a terminal condition. The domestic partner requests that the medical team focus exclusively on comfort measures and decline both surgical decompression and total parenteral nutrition (TPN). Shortly after, the patient's adult son from a previous marriage arrives. He is distraught, argues that the living will is outdated since it was signed years before the cancer diagnosis, and demands that the team immediately initiate TPN and consult surgery. The son threatens to file a lawsuit if his father is not treated aggressively. Which of the following is the most appropriate next step in management?

During a busy night shift, a $62$-year-old woman in the cardiac intensive care unit requires urgent amiodarone for sustained ventricular tachycardia. The cross-covering provider verbally requests the medication. Amidst multiple alarms, the bedside registered nurse incorrectly programs the smart intravenous pump, delivering the bolus over $1$ minute instead of $10$ minutes. The patient subsequently develops severe bradycardia and hypotension, requiring temporary transvenous pacing. She stabilizes after $30$ minutes and suffers no long-term sequelae. The hospital risk management department is notified of the medication delivery error the following morning. Which of the following is the most appropriate action for the institution to take to prevent similar future occurrences?

A 42-year-old man with end-stage liver cirrhosis is admitted to the intensive care unit following a massive esophageal variceal hemorrhage. Despite aggressive volume resuscitation and endoscopic intervention, he develops multi-organ failure. He remains deeply comatose, is dependent on mechanical ventilation, and the primary team determines he currently lacks decision-making capacity. The patient's long-term unmarried partner presents a valid, legally executed durable power of attorney for healthcare designating the partner as the patient's healthcare proxy. The partner states that the patient explicitly said on multiple occasions, "If I am ever dependent on machines with no hope of a meaningful recovery, let me go naturally." The partner formally requests that mechanical ventilation be withdrawn. Shortly after, the patient's biological parents, who have not communicated with the patient in over five years, arrive at the hospital. They adamantly oppose the partner's decision, demand that all life-sustaining measures be continued, and threaten to sue the medical team if life support is removed. Which of the following is the most appropriate next step in management?

A $28$-year-old man presents to an outpatient clinic with a $2$-day history of low-grade fever, myalgias, and mild fatigue. A newly FDA-approved point-of-care rapid antigen test for a circulating respiratory virus is available. Regional epidemiologic surveillance indicates that the current prevalence of this viral infection in the community is $10\%$. The manufacturer's validation studies report that the assay has a sensitivity of $80\%$ and a specificity of $95\%$. The physician performs the swab, and the test yields a positive result. Based on these statistical parameters, what is the approximate probability that this patient is actually infected with the virus?

A 68-year-old woman is admitted to the intensive care unit after suffering a massive intracerebral hemorrhage. She is comatose, requires mechanical ventilation, and lacks decision-making capacity. Her neurologic prognosis is deemed irreversible. The patient has a legally valid, written advance directive (living will) specifying that she does not want life-sustaining treatments, including mechanical ventilation, in the event of an irreversible neurologic injury. Her son, who is her legally appointed healthcare proxy, arrives at the hospital. After being updated on her prognosis, he states, "I know what her living will says, but as her proxy, I am overriding it. Keep her on the ventilator; I am not ready to let her go." Which of the following is the most appropriate next step in management?

A 32-year-old woman, G1P0, at 22 weeks gestation, presents to the clinic with gradually worsening shortness of breath and a persistent dry cough over the past 5 months. She works as a materials technician in a high-tech aerospace ceramics manufacturing facility. Her temperature is 37.1°C (98.8°F), blood pressure is 110/70 mmHg, pulse is 84/min, and respiratory rate is 18/min. Pulse oximetry shows 96% on room air. Physical examination reveals scattered fine crackles in both lung fields. A chest radiograph, performed with appropriate abdominal shielding, demonstrates bilateral hilar lymphadenopathy and reticular opacities. A subsequent transbronchial biopsy reveals noncaseating granulomas with no acid-fast bacilli or fungi. Which of the following is the most appropriate next step in management to establish the specific etiology of this patient's condition?

A public health task force is evaluating the statistical characteristics of a novel serological screening test for a regional infectious disease. Match each operational change in the screening program (left) with its corresponding effect on the test's performance parameters (right).

A multicenter study evaluates the diagnostic accuracy of a novel serological marker (anti-tissue transglutaminase isoform X) for identifying celiac disease. Researchers enroll $500$ adult patients presenting with chronic diarrhea and weight loss. All patients undergo both the novel serological test and a duodenal biopsy, which serves as the gold standard for diagnosis.

The biopsy results confirm celiac disease in $100$ of the enrolled patients. Among these $100$ patients, $85$ have a positive result on the novel serological test.

Among the $400$ patients who do not have celiac disease according to the biopsy, $360$ have a negative result on the novel serological test.

Based on these study results, what is the positive likelihood ratio ($LR+$) of the novel serological test for diagnosing celiac disease?

A 68-year-old man comes to the clinic to establish care after recently moving to the area. His past medical history is significant for essential hypertension and osteoarthritis. He reports that he smoked one pack of cigarettes daily from age 18 until he quit at age 45. He drinks alcohol occasionally. His family history is notable for a younger brother who was diagnosed with colon cancer at age 62. The patient brings his medical records, which demonstrate a normal screening colonoscopy performed at age 63. His current medications include lisinopril and acetaminophen as needed. Vital signs today are within normal limits, and physical examination shows no significant abnormalities. Which of the following is the most appropriate preventive screening intervention for this patient at this time?

A 58-year-old man is brought to the emergency department after sustaining a severe traumatic brain injury in a fall from a roof. He is comatose, requires emergent intubation, and lacks decision-making capacity. A review of his electronic medical record and discussions with his family confirm that he does not have an advance directive, nor has he designated a healthcare proxy or durable power of attorney for healthcare. He does not have a court-appointed guardian. Several family members have arrived at the hospital and wish to be involved in his care decisions. In most US jurisdictions, arrange the following individuals in the correct legal order of priority to act as the patient's surrogate decision-maker, from highest priority (first) to lowest priority (last).

A hospital's hematology-oncology clinic is preparing to launch a new outpatient blood transfusion service. Recognizing that this introduces a high-risk procedure to an ambulatory setting, the department leadership decides to conduct a Failure Mode and Effects Analysis (FMEA) to prospectively identify and mitigate risks before treating the first patient. Arrange the following steps of the FMEA process in the correct chronological sequence from initiation to final implementation.

A 55-year-old man with advanced amyotrophic lateral sclerosis is brought to the emergency department via ambulance due to severe respiratory distress. Upon arrival, he is lethargic, using accessory muscles to breathe, and unable to answer questions. Arterial blood gas reveals acute-on-chronic hypercapnic respiratory failure. The patient's sister, who is his legally appointed healthcare proxy, accompanies him. The patient's electronic medical record contains a legally binding advance directive, completed one year ago when he was fully competent. The directive explicitly states, "Under no circumstances do I want to be intubated or placed on noninvasive positive pressure ventilation." After the physician explains the patient's imminent risk of respiratory arrest, the sister tearfully requests that the patient be intubated, stating, "I know what the document says, but I cannot let my brother die today. Please intubate him just until the rest of the family can get here to say goodbye." Which of the following is the most appropriate next step in management?

A public health physician is consulting with the medical director of a long-term care facility regarding a rapidly spreading respiratory illness. Over the past 72 hours, 12 of the 60 residents on the facility's east wing have developed a sudden onset of high fever, chills, severe myalgias, and a nonproductive cough. Nasopharyngeal swabs from three of the symptomatic patients are positive for Influenza A. The facility records indicate an 85% coverage rate for the current season's inactivated influenza vaccine among residents. Symptomatic patients have been placed on droplet precautions and started on antiviral therapy. Which of the following is the most appropriate next step in managing this institutional outbreak?

Following a catastrophic subarachnoid hemorrhage, an adult female patient in the surgical intensive care unit permanently loses decision-making capacity. The clinical team determines that a tracheostomy is medically indicated and must seek consent. The patient's medical record does not contain a living will, and she does not have a court-appointed guardian. Several individuals are present in the waiting room, each insisting they have the authority to direct her care. Arrange the following individuals in the legally recognized order of priority for surrogate decision-making, from highest priority (first) to lowest priority (last).

A local health department receives multiple reports of severe acute gastroenteritis among attendees of a large community festival. As the lead public health physician, you are tasked with initiating the formal outbreak investigation. Arrange the following fundamental steps of the epidemiological investigation in the standard chronological sequence recommended by public health guidelines.

A regional blood bank is evaluating its screening protocol for a blood-borne virus. Currently, all donated blood is screened using a highly sensitive enzyme-linked immunosorbent assay (ELISA). Any blood sample that tests positive is immediately discarded. Due to a recent blood shortage, administrators want to reduce the amount of safe blood that is inappropriately discarded due to false-positive results. The medical director proposes a new two-step protocol: all donated blood will first be screened with the ELISA, and any positive samples will then be tested with a highly specific nucleic acid amplification test (NAAT). The blood will only be discarded if BOTH tests yield a positive result.

Compared to the current single-test protocol, implementation of this new two-step protocol will most likely result in which of the following changes to the overall screening program's statistical metrics?

During a community health outreach initiative, a physician evaluates a 56-year-old woman who is seeking to re-establish regular medical care. She reports feeling entirely well and has no specific complaints. Her medical history is notable for an HIV infection diagnosed a decade ago; her most recent CD4 T-lymphocyte count, drawn last week, is $135 \text{ cells/mm}^3$. She reached menopause five years ago and confirms she has had zero episodes of vaginal bleeding since that time. The patient has a $25$ pack-year history of smoking and continues to smoke roughly ten cigarettes daily. She has not received any immunizations or undergone any preventive health screenings in the past seven years.

Based on current preventive care guidelines, which of the following is the most appropriate intervention for this patient today?

Review the clinical scenarios below involving special populations and potential infectious exposures. Match each patient with the most appropriate next step regarding immunization or post-exposure prophylaxis.