Tüm alıştırma soruları

A 19-year-old college student is brought to the emergency department by emergency medical services with acute onset of severe headache, confusion, fever, and a rapidly spreading petechial rash. The triage nurse immediately suspects a highly contagious bacterial infection, likely meningococcemia. As the attending physician, you must coordinate the clinical management and the infection control response. Arrange the following actions in the most appropriate chronological sequence to ensure optimal patient care and minimize healthcare-associated transmission.

A 45-year-old male is admitted to the surgical intensive care unit after sustaining a severe anoxic brain injury following a prolonged out-of-hospital cardiac arrest. He is currently intubated, comatose, and lacks medical decision-making capacity. A comprehensive chart review and family interview reveal no written advance directive, no legally designated durable power of attorney for healthcare, and no court-appointed legal guardian. The clinical team must identify the appropriate legal surrogate decision-maker to discuss overall goals of care and the potential placement of a tracheostomy. Several individuals are present at the hospital and wish to direct his care. In accordance with standard U.S. legal and ethical consensus for statutory surrogate hierarchies, arrange the following individuals in the correct order of priority to act as the primary surrogate decision-maker, from highest priority (first authorized) to lowest priority.

A 55-year-old woman is admitted to the surgical ward following a total abdominal hysterectomy. On postoperative day 1, she develops severe hypotension and tachycardia. The primary care team discovers that an intravenous infusion bag hanging at the bedside, labeled as 'Cefazolin', actually contains a high-concentration continuous heparin infusion, resulting from a central pharmacy compounding error.

Arrange the following actions in the most appropriate chronological sequence for managing this sentinel event and conducting a systems-based investigation, according to standard patient safety and root cause analysis (RCA) frameworks.

A 28-year-old critically ill patient is admitted to the intensive care unit with profound acidemia, hyperglycemia, and elevated serum beta-hydroxybutyrate. The medical team initiates a continuous intravenous infusion of a hormone that binds to a transmembrane receptor with intrinsic enzymatic activity. In addition to halting lipolysis, this intervention aggressively stimulates the storage of glucose as a highly branched polymer in the liver. Arrange the following intracellular signaling events in the correct chronological sequence to describe the hepatocyte response to this continuous infusion.

A 32-year-old woman with severe symptomatic iron deficiency anemia is admitted to the hospital and started on a transfusion of packed red blood cells. Fifteen minutes after the transfusion is initiated, she acutely develops chills, severe lower back pain, and a feeling of impending doom. Her temperature is 39.1°C (102.4°F), blood pressure is 88/54 mm Hg, heart rate is 124/min, and respiratory rate is 24/min. Physical examination reveals flushing and diaphoresis. An acute hemolytic transfusion reaction is suspected. Arrange the following steps in the most appropriate chronological sequence for the immediate management and diagnostic workup of this patient.

A $35$-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 $148$/min, blood pressure is $62/40$ mmHg, and oxygen saturation is $84\%$ 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.

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.

A 52-year-old woman presents to the outpatient clinic with a 3-month history of progressive shortness of breath on exertion and a chronic, dry cough. She has no history of smoking and has worked as an office manager her entire life. Vital signs show a heart rate of 82 bpm, blood pressure of 124/78 mmHg, respiratory rate of 18/min, and an oxygen saturation of 92% on room air at rest that drops to 87% with ambulation. Physical examination is notable for fine, bilateral inspiratory crackles at the lung bases and digital clubbing. Cardiac examination reveals a normal S1 and S2 with no murmurs, and there is no jugular venous distention. A chest radiograph demonstrates bilateral reticular opacities predominantly in the lower lung zones.

Based on the patient's presentation, order the following differential diagnoses from the highest pre-test probability (most likely) to the lowest pre-test probability (least likely).

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.

A 28-year-old aid worker presents to a field clinic with severe, voluminous watery diarrhea and leg cramps. The responsible pathogen produces an AB-type exotoxin that causes profound fluid loss. Arrange the following steps of this toxin's cellular mechanism of action in the correct pathophysiological sequence, from initial interaction with the host cell to the ultimate physiologic effect.

A 45-year-old man undergoes a right hemicolectomy for a colon adenocarcinoma. His family history is notable for a father who died of colorectal cancer at age 49 and a sister diagnosed with endometrial cancer at age 46. The physician suspects Lynch syndrome and plans a comprehensive molecular and genetic evaluation.

Assuming this patient's cancer is ultimately found to be caused by a germline mutation in the MLH1 gene, arrange the following diagnostic and management steps in the most appropriate chronological order.

A 24-year-old woman is brought to the emergency department 36 hours after intentionally ingesting a massive quantity of an unknown over-the-counter analgesic. She is visibly jaundiced and lethargic. Laboratory studies show an aspartate aminotransferase (AST) of 8,500 U/L, an alanine aminotransferase (ALT) of 9,200 U/L, and a significantly prolonged prothrombin time. A subsequent liver biopsy reveals massive centrilobular (Zone 3) parenchymal necrosis. Based on the patient's presentation, arrange the following subcellular biochemical events in the correct chronological sequence that culminated in this patient's hepatocyte injury.

A 24-year-old man who recently emigrated from a region with low vaccination coverage presents to the emergency department with a 3-day history of severe sore throat, low-grade fever, and neck swelling. Physical examination reveals a tightly adherent, grayish-white pseudomembrane over the tonsils and posterior pharynx that bleeds slightly when manipulated. He also exhibits prominent bilateral cervical lymphadenopathy. A diagnosis of respiratory diphtheria is suspected, and appropriate therapy is initiated. Arrange the following steps in chronological order to describe the cellular mechanism of action for the primary virulence factor responsible for this patient's condition.

A 55-year-old man undergoes a screening colonoscopy, which reveals a 2-cm polyp in the descending colon. Biopsy shows a tubulovillous adenoma with high-grade dysplasia. The patient is scheduled for a polypectomy. The development of such lesions into invasive adenocarcinoma typically follows a well-characterized stepwise accumulation of genetic and epigenetic alterations.

Arrange the following molecular events in the typical chronological order of the classic adenoma-carcinoma sequence in colorectal cancer, from earliest (first) to latest (last).

A 24-year-old man with a strong family history of early-onset colon cancer undergoes a screening colonoscopy that reveals over 200 adenomatous polyps throughout his colon. Germline genetic testing confirms a nonsense mutation in the APC gene, establishing the diagnosis of familial adenomatous polyposis (FAP). In normal colonic epithelial cells, the wild-type APC protein acts as a critical tumor suppressor by regulating the Wnt/beta-catenin signaling cascade to prevent uncontrolled cell proliferation.

Arrange the following molecular events in the correct chronological sequence representing the normal processing of beta-catenin by the APC pathway in the absence of a Wnt ligand.

A 62-year-old woman is diagnosed with invasive ductal carcinoma of the breast. Pathologic evaluation reveals distant metastasis to the bone. To establish this distant metastasis, the neoplastic cells must have completed a series of complex biological steps known as the metastatic cascade. Arrange the following critical events of the metastatic cascade in the correct chronological sequence.

A 45-year-old man presents with fatigue, early satiety, and massive splenomegaly. Laboratory studies show a leukocyte count of $85,000/\mu\text{L}$ with a full spectrum of granulocytic differentiation. Cytogenetic analysis confirms a t(9;22) chromosomal translocation, and the patient is started on a targeted oral pharmacologic agent. Arrange the following molecular events in the correct chronological order, beginning with the underlying genetic aberration and concluding with the cellular response to the therapeutic intervention.

A $68$-year-old male is evaluated in the intensive care unit on hospital day $6$. He was initially admitted for a massive pulmonary embolism and has been receiving a continuous intravenous infusion of unfractionated heparin. Today, routine laboratory studies reveal a precipitous decline in his platelet count from an admission baseline of $240,000/\text{mm}^3$ to $60,000/\text{mm}^3$. Concurrently, the patient reports new-onset, severe pain in his right calf. A comprehensive physical examination demonstrates a pale, edematous, and tender right lower extremity. A stat duplex ultrasound confirms an acute deep vein thrombosis in the right popliteal vein. The clinical picture yields a 4T score of $7$, indicating a high probability of heparin-induced thrombocytopenia (HIT).

Arrange the following pharmacologic and diagnostic management steps in the strict chronological sequence required to safely treat this patient's coagulopathy and transition him to long-term oral anticoagulation.

During a didactic session on the pharmacology of chronic viral hepatitis, an infectious disease specialist highlights the unique replication mechanism of a specific hepatotropic virus. The physician emphasizes that unlike standard DNA viruses, this pathogen's eradication is exceptionally difficult due to a stable nuclear episome, and its targeted pharmacotherapy actually relies on inhibiting a viral reverse transcriptase. The discussion focuses on the precise molecular events that occur immediately after the virus binds to the host sodium taurocholate cotransporting polypeptide (NTCP) receptor and uncoats in the cytoplasm.

Arrange the following molecular events in the correct chronological sequence of this pathogen's intracellular replication cycle, beginning immediately after viral uncoating.

A 48-year-old man presents to the transplant clinic with a rapidly rising serum creatinine (2.8 mg/dL, up from a baseline of 1.2 mg/dL) and oliguria 4 weeks after receiving a deceased-donor renal allograft. His current immunosuppressive regimen includes tacrolimus, mycophenolate mofetil, and prednisone. Trough tacrolimus levels are within the therapeutic target range, and medication adherence is confirmed. He is afebrile, and his blood pressure is 150/90 mmHg. Physical examination reveals mild tenderness over the allograft site in the right lower quadrant. Based on the suspected immunopathologic process, arrange the following diagnostic and therapeutic steps in the most appropriate chronological sequence for the definitive evaluation and management of this patient's condition.