Tüm alıştırma soruları

An emergency department utilizes a quantitative plasma D-dimer assay to assist in ruling out pulmonary embolism in low-risk patients. The standard cutoff for a positive result is $500 \text{ ng/mL}$. In an effort to reduce the number of unnecessary computed tomography pulmonary angiograms, the department protocol is modified to use an age-adjusted cutoff, effectively raising the positivity threshold to $1000 \text{ ng/mL}$ for patients over the age of 80. Assuming the disease prevalence remains constant, which of the following best describes the expected impact of this protocol change on the diagnostic characteristics of the D-dimer test in this patient population?

A 62-year-old man presents to the emergency department with a 1-day history of fever, severe right upper quadrant abdominal pain, and confusion. His temperature is 39.2°C (102.6°F), blood pressure is 88/56 mmHg, and heart rate is 118/min. Physical examination reveals pronounced scleral icterus and right upper quadrant tenderness without rebound or guarding. Laboratory studies show a leukocyte count of 18,000/mm³, total bilirubin of 6.8 mg/dL, and alkaline phosphatase of 480 U/L.

Arrange the following management steps in the most appropriate sequential order for this patient, from immediate priority to definitive long-term treatment.

A 32-year-old recreational skier is admitted after sustaining a closed diaphyseal fracture of the right tibia. Following closed reduction and immobilization in a circumferential long-leg cast, he is monitored on the orthopedic ward. Fourteen hours later, he develops excruciating leg pain that worsens with passive movement and is entirely refractory to high-dose intravenous analgesia. Arrange the following clinical steps in the appropriate chronological sequence for the definitive management of this patient's evolving condition.

A healthcare system is establishing a new quality improvement curriculum for clinical staff. Match each described clinical scenario with the most appropriate quality improvement methodology or tool.

Match each patient's clinical presentation with the most appropriate initial pharmacological intervention.

A gastroenterology research network is evaluating a novel fecal biomarker to detect advanced colorectal adenomas. A prospective validation study enrolls $1,200$ asymptomatic adults undergoing screening colonoscopy, which serves as the gold standard. Colonoscopy confirms the presence of advanced adenomas in $200$ of the participants. The novel biomarker test correctly identifies $160$ of these participants. Additionally, the biomarker test yields a positive result in $90$ participants who are confirmed to have no adenomas on colonoscopy. What is the positive predictive value of the novel biomarker test in this study population, expressed as a percentage?

A $45$-year-old man is brought to the emergency department by ambulance following an industrial boiler explosion. The injury occurred exactly $2$ hours prior to his arrival. He sustained deep partial-thickness and full-thickness thermal burns to his entire anterior trunk and his entire left lower extremity. His airway is intact without signs of inhalation injury, and there is no evidence of electrical injury. The patient weighs $80\text{ kg}$ ($176\text{ lbs}$). No intravenous fluids were administered in the prehospital setting. According to current Advanced Trauma Life Support (ATLS) guidelines for adult thermal burns, the medical team initiates resuscitation with lactated Ringer solution. What is the appropriate initial rate of intravenous fluid administration in $\text{mL/hr}$ for this patient?

A 32-year-old male is brought to the emergency department via ambulance after being involved in a high-speed motor vehicle collision. Primary and secondary trauma surveys reveal that he is hemodynamically stable with no life-threatening injuries. The patient reports excruciating left hip pain and is unable to move his left leg. On physical examination, the left lower extremity is shortened, internally rotated, and adducted. The skin is intact. Initial assessment reveals palpable dorsalis pedis and posterior tibial pulses, as well as normal sensation over the dorsum and plantar aspects of the left foot.

Arrange the following interventions in the most appropriate chronological sequence for the definitive evaluation and management of this patient's orthopedic injury.

Medical researchers are analyzing the impact of a plant-based diet on the development of chronic kidney disease (CKD). They utilize a national health registry that contains detailed historical dietary questionnaires and subsequent medical diagnoses. The researchers query the registry to identify 10,000 individuals who reported strictly adhering to a plant-based diet in the year 2010, and another 10,000 individuals who consumed standard omnivorous diets during the same year. They then review the existing longitudinal medical records of these individuals from 2010 through 2025 to determine how many in each group developed stage 3 or higher CKD. Which of the following best characterizes the methodological approach of this investigation?

A clinical team is reviewing the charts of four patients to plan their evidence-based preventive care. Associate each patient's demographic and clinical history with the most strictly indicated clinical intervention or guideline recommendation.

A 68-year-old woman with a history of atrial fibrillation presents to the emergency department with a 3-hour history of sudden, severe right leg pain. On physical examination, her right lower extremity is pale and cold. Femoral pulses are palpable bilaterally, but right popliteal and pedal pulses are absent. Bedside Doppler evaluation reveals absent arterial signals but audible venous signals in the right foot. Motor function is intact, and there is mild sensory loss in the toes. Arrange the following management steps in the most appropriate chronological sequence for this patient.

A $42$-year-old woman presents to the emergency department with a $4$-hour history of sudden-onset, severe, colicky periumbilical pain that radiates to her back. She also reports several episodes of severe nausea and nonbilious emesis. Her medical history is notable for morbid obesity treated with a laparoscopic Roux-en-Y gastric bypass $3$ years ago. Her temperature is $37.2^\circ\text{C}$ ($99.0^\circ\text{F}$), blood pressure is $135/85\text{ mm Hg}$, pulse is $112/\text{min}$, and respirations are $18/\text{min}$. On physical examination, her abdomen is soft and non-distended but exquisitely tender to deep palpation in the mid-abdomen. There is no rebound tenderness or muscle guarding. Bowel sounds are hyperactive. Laboratory studies show a leukocyte count of $9,500/\text{mm}^3$ and a serum lactate level of $1.2\text{ mmol/L}$ (normal: $0.5-2.2\text{ mmol/L}$). A computed tomography scan of the abdomen and pelvis with intravenous contrast reveals a cluster of dilated small bowel loops in the left upper quadrant and a swirling pattern of the mesenteric vessels at the root of the mesentery. Which of the following is the most appropriate next step in management?

A 35-year-old man with a history of schizoaffective disorder is admitted to the inpatient psychiatric unit due to an acute exacerbation of psychotic symptoms. He is started on fluphenazine. Three days later, the nursing staff finds him confused and diaphoretic. Vital signs show a temperature of 39.5°C (103.1°F), blood pressure of 160/100 mmHg, and heart rate of 122/min. Physical examination reveals profound lead-pipe muscle rigidity. Laboratory studies demonstrate a markedly elevated serum creatine kinase (CK) level and leukocytosis. Arrange the following steps in the management of this patient's current condition in the most appropriate sequential order, from the initial, most critical action to treatments reserved for refractory cases.

Surgical consultation is requested for a 58-year-old male inpatient whose clinical status acutely deteriorated on the seventh day following an elective open right hemicolectomy for a large cecal adenoma. His recovery was initially unremarkable; he tolerated a liquid diet and passed flatus on the fourth day after surgery.

Over the past 8 hours, the patient developed sudden-onset, severe, and continuous abdominal pain. He reports the pain is agonizing and poorly relieved by intravenous morphine. He has had two episodes of non-bilious emesis.

Physical examination reveals a moderately distended abdomen. The midline surgical incision is clean and intact without erythema or fluctuance. Palpation elicits mild diffuse tenderness but no rebound, guarding, or rigidity. Bowel sounds are hypoactive.

Arterial blood gas analysis on room air shows a pH of $7.27$, PaCO $_2$ of $32\text{ mm Hg}$, and PaO $_2$ of $88\text{ mm Hg}$.

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

A 15-month-old girl is evaluated in the pediatric immunology clinic. She was diagnosed with 22q11.2 deletion syndrome shortly after birth when she presented with hypocalcemic tetany. She has a history of recurrent viral respiratory infections and oral candidiasis. Current medications include calcium supplementation and trimethoprim-sulfamethoxazole. Her physical examination is notable for micrognathia, low-set ears, and a harsh systolic ejection murmur at the left upper sternal border. Recent laboratory evaluation reveals an absolute CD3+ T-lymphocyte count of $350 \text{ cells/mm}^3$ (normal for age: $1,500$–$5,000 \text{ cells/mm}^3$). The parents inquire about her 12-to-15-month immunizations, noting she has received all her recommended inactivated infant vaccines but has not yet received the measles-mumps-rubella (MMR) or varicella vaccines. Which of the following is the most appropriate next step regarding her immunizations?

A 32-year-old woman comes to the clinic seeking help to stop drinking alcohol. She reports drinking 1 to 2 bottles of wine every evening for the past year. She tried to quit two days ago but experienced severe cravings, anxiety, and mild tremors, leading her to resume drinking. She also reports feeling severely depressed, with low energy, poor concentration, and feelings of worthlessness for the past month. Her psychiatric history is notable for a hospitalization three years ago due to an episode of severe agitation, rapid pressured speech, grandiosity, and a lack of need for sleep lasting 10 days. Her medical history includes chronic low back pain, for which she takes tramadol on an as-needed basis; she last took a dose this morning. Physical examination and laboratory studies, including liver function tests and serum creatinine, are within normal limits. Which of the following is the most appropriate pharmacotherapy regimen for this patient?

A 24-year-old man is diagnosed with schizophrenia after presenting with a 7-month history of auditory hallucinations and persecutory delusions. His psychiatrist is planning a long-term pharmacotherapy strategy. Assuming the patient exhibits an inadequate clinical response to each consecutive intervention despite optimal dosing and confirmed medication adherence, arrange the following treatment steps in the correct standard algorithm for the management of schizophrenia.

A 22-year-old man is evaluated in the trauma intensive care unit for acute-onset respiratory distress and altered mental status. Twenty hours ago, he was involved in a motorcycle collision, sustaining a closed, comminuted fracture of the right femoral shaft and a nondisplaced fracture of the left radius. He was initially hemodynamically stabilized, splinted, and placed in skeletal traction while awaiting definitive surgical fixation. His current temperature is 37.9°C (100.2°F), blood pressure is 112/68 mm Hg, pulse is 126/min, and respiratory rate is 28/min. Pulse oximetry reveals an oxygen saturation of 86% on room air. Physical examination demonstrates scattered, non-blanching erythematous macules over the anterior chest and axillae. Lung auscultation reveals bilateral diffuse crackles. Neurologic examination shows a restless and confused patient without focal motor or sensory deficits. Which of the following is the most likely diagnosis?

A 75-year-old man is brought to the emergency department from an assisted living facility due to progressively worsening abdominal distension and failure to pass stool or flatus for the past 3 days. His medical history includes chronic constipation, hypertension, and schizophrenia. His vital signs are temperature 37.1°C (98.8°F), blood pressure 130/80 mmHg, pulse 85/min, and respirations 16/min. On physical examination, the abdomen is massively distended and tympanitic to percussion, but there is no guarding or rebound tenderness. Digital rectal examination reveals an empty rectal vault. An upright abdominal X-ray demonstrates a markedly dilated loop of colon extending from the pelvis toward the right upper quadrant, resembling a "coffee bean," with no evidence of pneumoperitoneum. Which of the following is the most appropriate next step in management?

A 53-year-old woman is brought to the acute care clinic by her spouse due to severe abdominal discomfort. She underwent an uncomplicated laparoscopic cholecystectomy 6 weeks ago. Over the past 48 hours, she developed abdominal swelling, obstipation, and bilious emesis. During the last 2 hours, her pain transitioned from an intermittent crampy sensation to a constant, excruciating ache.

Vital signs reveal a temperature of $39.1^\circ\text{C}$ ($102.4^\circ\text{F}$), heart rate of $132\text{ /min}$, respiratory rate of $26\text{ /min}$, and blood pressure of $82/50\text{ mmHg}$.

Physical examination demonstrates a markedly distended, rigid abdomen with diffuse rebound tenderness and involuntary guarding. Bowel sounds are absent.

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