45yo man presents to your office reporting diplopia in all directions. He has a history of hypothyroidism. Blood work and brain magnetic resonance imaging(MRI) are entirely normal. What would you do next?

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: 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.

Correct Answer: D

Rationale: Cholesterol crystals in synovial fluid are a normal finding in chronic joint effusions, such as in rheumatoid arthritis or osteoarthritis, rather than a specific disease like hyperlipidemia.

Correct Answer: C

Rationale: Preload reduces glomerular filtration resulting in fluid conservation, or edema. Increased preload may lead to an increased, not decreased, heart rate. Increased preload may lead to shortness of breath and an increased respiratory rate. Increased preload may lead to fatigue, not excitability, as the heart works harder to circulate blood.