Orthostatic Hypotension Diagnosis and Management

Primary Diagnostic Categories

Orthostatic hypotension has three main etiologic categories: medication-induced, neurogenic autonomic failure, and non-neurogenic causes including volume depletion and cardiovascular dysfunction, as stated by the American College of Cardiology 1, 2

Diuretics are among the most frequent culprits, causing OH through volume depletion, according to the American Diabetes Association 3, 1, 2
Vasodilators, including nitrates, directly reduce vascular tone and contribute to OH, as reported by the American College of Cardiology 2
Alpha-adrenergic blockers impair vasoconstriction and are particularly problematic in initial orthostatic hypotension, as stated by the American College of Cardiology 2
Beta-blockers can worsen orthostatic symptoms, according to the American College of Cardiology 2
Psychotropic medications, such as antidepressants and antipsychotics, commonly cause OH, as reported by the American College of Cardiology 4

Neurogenic OH is characterized by cardiovascular sympathetic fiber failure resulting in inadequate vasoconstriction and blunted heart rate response upon standing, as stated by the American College of Cardiology 2
Multiple system atrophy with widespread autonomic degeneration is a cause of neurogenic OH, according to the American College of Cardiology 5, 2
Parkinson's disease with autonomic involvement is a cause of neurogenic OH, as reported by the American College of Cardiology 5, 1
Pure autonomic failure affecting peripheral autonomic nerves is a cause of neurogenic OH, according to the American College of Cardiology 5, 2

Measure blood pressure after 5 minutes lying/sitting, then at 1 and 3 minutes after standing to document OH, as recommended by the American College of Cardiology 5, 1, 4
Perform a comprehensive medication review focusing on all vasoactive agents, as stated by the American College of Cardiology 1, 4
Assess volume status, including signs of dehydration or blood loss, according to the American College of Cardiology 1
Perform a neurological examination for signs of autonomic dysfunction, as recommended by the American Diabetes Association 3, 1

Discontinue or modify culprit medications as the primary intervention, as recommended by the American Diabetes Association 3, 1, 4
Increase fluid intake to 2-3 liters daily and salt consumption to 6-9g daily if not contraindicated by heart failure, according to the American College of Cardiology 3, 4
Teach physical counter-maneuvers, such as leg crossing, squatting, stooping, and muscle tensing, during symptomatic episodes, as recommended by the American College of Cardiology 3, 4
Use compression garments, such as waist-high stockings and abdominal binders, to reduce venous pooling, according to the American College of Cardiology 3, 4
Elevate the head of the bed by 10 degrees during sleep to prevent nocturnal polyuria and supine hypertension, as recommended by the American College of Cardiology 4
Consider midodrine, fludrocortisone, and droxidopa as first-line medications for orthostatic hypotension, as stated by the American College of Cardiology 3, 1, 4

More than 50% of patients with neurogenic orthostatic hypotension develop supine hypertension, a life-threatening complication that can cause left ventricular hypertrophy, stroke, and sudden death, according to the Hypertension journal 6
Diabetic patients have a 38-44% incidence of dysautonomia with higher cardiovascular mortality, and optimizing glucose control can prevent progression of autonomic neuropathy, as recommended by Diabetes Care 7
The European Heart Journal suggests avoiding the term "drop attacks" for falls due to orthostatic hypotension, instead using the specific term "falls due to orthostatic hypotension" 8

Midodrine is the primary medication for symptomatic orthostatic hypotension causing functional impairment, with an average effective dose of approximately 0.25 mg/kg per day, and its active metabolite increases vascular tone, elevating standing systolic BP by approximately 15-30 mmHg at 1 hour after a 10 mg dose, with effects persisting 2-3 hours 6