Based on the information available so far, which features deserve the most attention as you begin evaluating this patient?

Sprint 03: Lightheaded and Weak for Five Days

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Absence of chest pain, palpitations, syncope, or focal neurologic symptoms

Assess for additional sources of fluid loss.

Review prior blood-pressure measurements and cardiovascular history.

Characterize the recent respiratory illness further.

Clarify the relationship of symptoms to standing, exertion, meals, and fluid intake.

Perform a focused neurologic examination.

Review prescription medications, recent additions or dose changes, and over-the-counter products.

Before deciding what is causing his symptoms, choose the three areas you would prioritize next.

Stop all antihypertensive medications because the current blood pressure and orthostatic findings show that hypertension treatment is no longer necessary.

Hold or reassess the recently added diuretic, address the volume and electrolyte abnormalities, and determine the treatment setting based on severity and ability to safely correct them.

Treat the volume and electrolyte abnormalities, but leave the medication regimen unchanged until repeat testing establishes that hydrochlorothiazide was causal.

Attribute the abnormalities primarily to reduced intake, continue the current antihypertensive regimen, encourage hydration, and repeat laboratory testing soon.