What is the single most informative study in patients with medically refractory GERD?

Correct Answer: B

Rationale: In medically refractory GERD, pH monitoring is the most informative study to quantify acid reflux and correlate it with symptoms, guiding further management like surgery. EGD assesses complications but is less definitive for reflux severity.

Correct Answer: D

Rationale: The correct answer is 'Both B and C' because CT of the chest can reveal tumors (like thymoma) associated with myasthenia gravis, which causes diplopia, and EMG/NCV is useful for confirming neuromuscular junction disorders.

Correct Answer: C

Rationale: Thalassemia patients may require iron if deficient (e.g., from blood loss), though iron overload is a concern in transfusion-dependent cases. The absolute 'never' is incorrect. Other statements align with anemia pathophysiology.

Correct Answer: A

Rationale: This statement is true as all listed factors (epidural catheters, diabetes mellitus, alcoholism, HIV infection, bacteremia, and IV drug use) are well-documented risk factors for spinal epidural abscesses due to their association with infection or immune compromise.

Correct Answer: A

Rationale: Home blood pressure monitoring provides a more accurate reflection of overall cardiovascular risk compared to sporadic office readings and avoids white-coat effects.