Questões de USMLE
3.602 questões com gabarito e explicação.
Fazer o diagnóstico grátisA cancer screening program detects numerous tumors with excellent 10-year survival rates. However, interval cancers discovered between screening visits in asymptomatic patients dem…
A multicenter trial enrolls patients with acute decompensated heart failure in waves of 4 at each site. Within each group of 4, exactly 2 patients are assigned to the new diuretic …
Investigators are designing an observational study comparing fracture risk in chronic glucocorticoid users and nonusers. They are particularly concerned that age and sex differ sub…
Investigators study a possible association between a pesticide and Parkinson disease. They enroll 120 patients with Parkinson disease and 200 controls without Parkinson disease. Am…
A new antiviral medication is introduced for a chronic infection in a city of 1 million people. The drug does not prevent new infections, but it markedly shortens the duration of s…
A 30 year old primigravid woman experiences an intrauterine fetal demise at 32 weeks' gestation. In the same hospital that year, there are 8 late fetal deaths and 12 neonatal death…
A nested case control study of venous thromboembolism is conducted within a large cohort of women using oral contraceptives. Each time a new thrombosis case occurs, controls are se…
A multicenter hypertension trial finds that a small number of blood pressure readings are missing because some laboratory printouts were accidentally destroyed in a flood affecting…
A rehabilitation study evaluates mobility outcomes in 47 elderly patients (mean age 72) using a 0–20 mobility scale. At baseline, 60% of highly functional participants score 20 des…
A 50-year-old man with heart failure (ejection fraction 35% on echocardiography) on metoprolol and lisinopril completes a new 12-item questionnaire designed to measure medication a…
A 27-year-old man presents with fever (39.2°C), cough, and dyspnea. Vital signs show BP 118/76, HR 102, RR 22, SpO2 88% on room air. Chest X-ray reveals bilateral infiltrates. Bloo…
A 27-year-old nulliparous woman presents for contraception counseling. Vital signs are stable (BP 118/76, HR 72, RR 14, Temp 37°C). She takes no medications and denies contraindica…
A 78-year-old woman with advanced dementia (MRI shows cerebral atrophy) presents with baseline Mini-Cog score of 0/30. Her daughter reports progressive memory loss over 3 years des…
A data safety monitoring board reviews efficacy outcomes every 3 months during a large stroke prevention trial enrolling 2,400 patients. The biostatistician notes that repeated loo…
A 59 year old man with refractory lymphoma enrolls in a phase 2 trial with 3 treatment arms. After a planned interim analysis, the arm with the lowest response rate is dropped and …
A 61 year old woman with chronic obstructive pulmonary disease enrolls in a cohort study of coffee intake and lung cancer. Investigators adjust for smoking status as current, forme…
A 48 year old man with alcohol use disorder is admitted for pancreatitis. Researchers study only hospitalized patients and find that among admitted patients, obesity appears negati…
A cohort study follows 82 year old adults with severe aortic stenosis to estimate time to hospitalization for heart failure. Many participants die from noncardiac causes before the…
A dermatopathologist reviews 60 skin biopsy slides, classifying each as benign or malignant based on histologic features including cellular atypia and mitotic rate. Four weeks late…
A 58-year-old man with type 2 diabetes (HbA1c 9.2%, fasting glucose 187 mg/dL) presents for cost analysis study enrollment. Linear regression models his HbA1c versus annual healthc…
A 26-year-old man presents with fever (38.8°C), productive cough, and malaise 2 weeks after cleaning a chicken coop in the Ohio River valley. Vital signs show BP 118/76, HR 92, RR …
A 32 year old woman with stable generalized anxiety disorder completes the same validated anxiety inventory on Monday and again 1 week later before any treatment change. Investigat…
A 52-year-old man with hypertension (BP 168/98 mmHg, HR 88, RR 16, Temp 37.2°C) undergoes evaluation for cardiovascular risk. A regression model predicts systolic blood pressure us…
A 55-year-old man with poorly controlled diabetes mellitus presents with fever (39.2°C), tachycardia (110 bpm), and black necrotic tissue on the hard palate extending into the righ…