Treatment of Orthostatic Hypotension
Begin with nonpharmacological interventions as first-line therapy, including acute water ingestion (≥480 mL for immediate relief), physical counter-pressure maneuvers, and compression garments extending at least thigh-high and preferably including the abdomen, before escalating to pharmacological agents. 1
Initial Management Approach
Step 1: Identify and Address Reversible Causes
- Medication review is critical: Discontinue or reduce diuretics, vasodilators, and other hypotensive medications 1
- Evaluate for dehydration and volume depletion
- Screen for postprandial hypotension and supine hypertension, as these commonly coexist and fundamentally alter treatment strategy 2
Step 2: Nonpharmacological Interventions (First-Line)
Acute interventions for immediate symptom relief:
- Acute water ingestion: ≥480 mL provides maximal benefit, with peak effect at 30 minutes; avoid adding glucose or salt as this reduces efficacy 1
- Physical counter-pressure maneuvers: Squatting provides the largest blood pressure increase, followed by leg crossing and lower body muscle tensing; requires adequate prodrome warning 1
Chronic management strategies:
- Compression garments: Must be at least thigh-high, preferably including abdomen; shorter garments are ineffective 1
- Increased salt and fluid intake: 6-9 g (100-150 mmol; approximately 1-2 teaspoons) of salt daily increases plasma volume 1
Pharmacological Treatment (When Nonpharmacological Measures Insufficient)
First-Line Pharmacological Agents
Midodrine (FDA-approved):
- Dose-dependent improvement in standing blood pressure and symptoms 1
- Major limitation: Supine hypertension
- Other side effects: Scalp tingling, piloerection, urinary retention 1
Droxidopa (FDA-approved):
- Effective for neurogenic OH due to Parkinson disease, pure autonomic failure, and multiple system atrophy 1
- May reduce falls based on small studies 1
- Critical caveat: Carbidopa in Parkinson's patients decreases droxidopa effectiveness 1
- Limitations: Supine hypertension, headache, dizziness, nausea 1
Second-Line Pharmacological Agents
Fludrocortisone:
- Increases plasma volume with resultant symptom improvement 1
- Use only when supine hypertension is absent; other medications should be tried first if supine hypertension present 1
- Side effects: Edema, hypokalemia, headache
- Serious adverse reactions: Adrenal suppression and immunosuppression with doses >0.3 mg daily 1
Off-Label Options
- Atomoxetine and pyridostigmine may be considered as part of individualized treatment 2
Critical Clinical Pitfalls
Supine hypertension: This is the most common limiting factor for pharmacological therapy. When present, avoid fludrocortisone and carefully titrate midodrine and droxidopa 1
Treatment targets: Focus on symptom relief and fall prevention, not blood pressure numbers 2
Acute water ingestion misuse: This is for occasional, temporary relief only—not intended for routine or long-term use 1
Compression garment selection: Shorter garments (below thigh-high) are ineffective; must include abdomen for optimal benefit 1
Special Populations
Neurogenic OH (neurodegenerative disorders, autonomic neuropathies):
- All the above treatments apply
- Distinguish between classic and delayed OH presentations 1
- Most commonly due to multiple system atrophy, pure autonomic failure, or diabetic autonomic neuropathy 1
Non-neurogenic OH:
- Most commonly due to dehydration or medications 1
- Focus heavily on reversible causes and nonpharmacological interventions
Treatment Algorithm Summary
- Screen for postprandial hypotension and supine hypertension
- Review and discontinue causative medications
- Implement nonpharmacological measures: Water ingestion, compression garments, physical maneuvers, increased salt/fluid
- If inadequate response, add midodrine or droxidopa (FDA-approved options)
- If supine hypertension absent and still inadequate, consider fludrocortisone
- Titrate based on symptoms and fall prevention, not blood pressure targets