Vinyl chloride exposure is most commonly associated with which malignancy?

Correct Answer: D

Rationale: Chronic vinyl chloride exposure is linked to hepatic angiosarcoma, a rare liver cancer.

Correct Answer: B

Rationale: More conservative fluid resuscitation is associated with lower mortality in AKI, as excessive fluids can worsen outcomes by causing fluid overload.

Correct Answer: D

Rationale: Given the patient's complex comorbidities (COPD, diabetes, hypertension, prior MI) and obesity (BMI 45), in-laboratory polysomnography is the most appropriate evaluation. It provides comprehensive data on sleep architecture and respiratory events, critical for accurate OSA diagnosis in high-risk patients, per AASM guidelines.

Correct Answer: B

Rationale: Type I second-degree block is associated with progressively lengthening PR intervals until one P wave is not conducted and becomes a dropped beat. Second-degree block is not characterized by an absence of P waves. Type II second-degree block is associated with a consistent PR interval and dropped beats. The ECG of third-degree block shows regularly occurring P waves that are independent of the ventricular rhythm.

Correct Answer: D

Rationale: Patients at highest risk for heart failure include those with conditions directly affecting the heart, such as myocardial infarction (A), valvular issues like mitral stenosis (C), and uncontrolled hypertension (E). Asthma, hypoparathyroidism (B), and lung cancer (D) are less directly linked to heart failure.