Orthostatic Hypotension Assessment and Management

Diagnostic Considerations

The American Heart Association recommends measuring lying and standing blood pressures to assess for orthostatic hypotension, defined as a drop of ≥20 mmHg systolic or ≥10 mmHg diastolic within 3 minutes of standing, in patients on blood pressure medication 1
Orthostatic hypotension occurs in approximately 7% of men over 70 years old and carries a 64% increase in age-adjusted mortality, plus increased risk of falls and fractures 1
The European Society of Cardiology suggests that beta-blockers, such as metoprolol, have a strong correlation with orthostatic hypotension and baroreflex dysfunction 1

The American College of Cardiology recommends reviewing the patient's current antihypertensive regimen for drugs most likely to cause orthostatic hypotension, such as ACE inhibitors, which increase the risk of hypotension, dizziness, fatigue, and falls, especially when started at high doses in patients ≥75 years 2, 3
Calcium channel blockers, such as amlodipine, can cause dizziness, headache, and edema 3, 4
Diuretics may aggravate orthostatic hypotension through volume depletion 1
Alpha-blockers can cause postural hypotension and dizziness, especially when combined with diuretics or vasodilators 2

The American Heart Association recommends verifying if the patient's blood pressure is being overtreated, with a target systolic BP <150 mmHg for most patients ≥60 years to reduce mortality, stroke, and cardiac events 5, 3, 4
Aggressive BP targets (<140 mmHg) show only small additional benefits with inconsistent results 5, 4
Consider that older patients may have "brittle hypertension" requiring slow titration 1

Postural unsteadiness, visual disturbances, or syncope suggest orthostatic hypotension 1
New neurological symptoms, chest pain, or severe headache require evaluation for end-organ damage 1
Cognitive impairment may indicate chronic hypoperfusion from overly aggressive BP control 1

Do not rely solely on seated blood pressure measurements, as this misses orthostatic hypotension 1
Do not assume dizziness is unrelated to medications without checking orthostatic vitals 1
Do not continue aggressive BP lowering in elderly patients experiencing dizziness without reassessing targets 2, 1
Recognize that polypharmacy (particularly in patients ≥75 years) increases the risk of potentially inappropriate medications causing adverse drug reactions, including falls and dizziness 2

If orthostatic hypotension is confirmed, review and adjust the antihypertensive regimen, particularly beta-blockers, alpha-blockers, and high-dose ACE inhibitors 2, 1
Consider dose reduction or medication discontinuation if BP is below target 1
Monitor renal function if adjusting ACE inhibitors or ARBs 2

The American College of Cardiology recommends measuring lying and standing blood pressures to confirm orthostatic hypotension, which is critical in identifying the culprit drug(s) and adjusting dosing 6
The Journal of the American College of Radiology suggests evaluating for non-medication causes of dizziness, such as vestibular disorders, cardiovascular disease, and CNS pathology, if symptoms persist despite medication adjustment 7
The Pharmacology and Therapeutics journal notes that elderly women are at higher risk for hyponatremia and hypokalemia with thiazide diuretics, and recommends monitoring electrolytes closely 8