Orthostatic Hypotension

In a patient with syncope, recurrent falls, presyncope, or orthostatic intolerance, first determine whether hypotension is part of an immediately reversible hemodynamic problem. Assess pulse and rhythm, volume status, active bleeding risk, fever or infection, medication exposure, and cardiopulmonary findings; an irregular pulse should prompt caution with automated blood-pressure devices because they can overestimate systolic pressure in atrial fibrillation. BMJBMJAssessment of hypotension - Differential diagnosis of symptoms | BMJ Best Practice

For diagnostic measurement, obtain supine blood pressure after 5 minutes of rest, then measure during standing through 3 minutes. Orthostatic hypotension is a systolic decrease of at least 20 mmHg, at least 30 mmHg in patients with hypertension, and/or a diastolic decrease of at least 10 mmHg within 3 minutes. Document symptoms at each time point because cerebral hypoperfusion symptoms, syncope, and falls determine clinical significance and treatment urgency. BMJ+1BMJOrthostatic hypotension - Symptoms, diagnosis and treatmentBMJAssessment of hypotension - Differential diagnosis of symptoms | BMJ Best Practice

If bedside measurements are negative despite a compelling positional history, repeat standardized recordings when symptomatic or use head-up tilt assessment to reproduce the blood-pressure and heart-rate response. A single normal set of orthostatic vital signs should not terminate evaluation when episodes are intermittent, medication-related, or volume sensitive. ccjmccjmEvaluation and management of orthostatic hypotension

A preserved tachycardic response to falling blood pressure favors non-neurogenic orthostatic hypotension. Review for reduced effective circulating volume, acute or chronic blood loss, and drugs that impair volume or vascular compensation; non-neurogenic causes can also substantially worsen pre-existing autonomic failure. BMJ+1BMJAutonomic diseases: clinical features and laboratory evaluationccjmEvaluation and management of orthostatic hypotension The immediate next step is targeted reversal of the identified driver rather than empiric long-term pressor therapy.

A blunted heart-rate response—particularly delta heart rate/delta systolic blood pressure below 0.5—supports impaired baroreflex-mediated autonomic compensation. The ratio had reported sensitivity of 91% and specificity of 88% in one study, but later work found specificity as low as 50%; interpret it with the clinical context rather than as a stand-alone diagnosis. ccjmccjmEvaluation and management of orthostatic hypotension Peripheral neuropathy and synucleinopathies are named neurogenic causes, and coexisting supine hypertension increases the likelihood that management will require a pressor-risk tradeoff. BMJ+1BMJOrthostatic hypotension - Symptoms, diagnosis and treatmentThe LancetDiagnosis and treatment of orthostatic hypotension - The Lancet

For persistent, unexplained, or progressive suspected neurogenic orthostatic hypotension, escalate phenotyping according to associated neurologic and systemic findings. Available formal evaluations include autonomic nervous system testing, electromyography and nerve-conduction studies, skin biopsy for nerve-fiber density, serum paraneoplastic and autoimmune neuroautoantibody panels, and abdominal fat-pad biopsy. ccjmccjmEvaluation and management of orthostatic hypotension Select these studies to test a specific suspected autonomic neuropathy, paraneoplastic/autoimmune process, or amyloid process rather than ordering a uniform panel.

Start by correcting reversible causes and reducing exposures that contribute to orthostatic blood-pressure failure. Recheck supine and standing pressures after each meaningful medication or volume intervention, because treatment response determines whether residual autonomic failure is clinically important. In patients with autonomic failure, non-neurogenic stressors may enhance orthostatic hypotension considerably. BMJBMJAutonomic diseases: clinical features and laboratory evaluation

For severe orthostatic hypotension due to autonomic dysfunction after corrective factors have been excluded and other measures are inadequate, midodrine is a treatment option. BMJBMJMidodrine for severe orthostatic hypotension | Drug and Therapeutics Bulletin Its use requires position-specific blood-pressure surveillance because standard drug treatment can worsen supine hypertension. The Lancet+1The LancetManagement of neurogenic orthostatic hypotension: an updateThe LancetDiagnosis and treatment of orthostatic hypotension - The Lancet Avoid evaluating benefit only from an office standing measurement; reassess dizziness, presyncope, falls, and ability to remain upright for required activities.

Droxidopa increases norepinephrine availability and sympathetic tone; fludrocortisone expands volume through sodium and water retention but requires caution for supine hypertension and hypokalemia. Pyridostigmine augments sympathetic ganglionic transmission and may improve standing vascular resistance without significantly affecting supine blood pressure; published reviews describe its benefit as modest. The Lancet+1The LancetManagement of neurogenic orthostatic hypotension: an updateNatureDiabetic neuropathy: cutting-edge research and future ... Choice should be driven by the patient’s dominant physiologic deficit and supine blood-pressure liability rather than routine combination treatment.

At follow-up, repeat standardized supine and standing blood pressure and heart rate, record interval syncope, falls, presyncope, and upright activity limitation, and compare findings with the pre-intervention pattern. Orthostatic hypotension is clinically consequential when cerebral hypoperfusion produces symptoms and can lead to syncope and falls. BMJBMJOrthostatic hypotension - Symptoms, diagnosis and treatment Persistent symptoms despite correction of reversible contributors should prompt reassessment for neurogenic disease or an unrecognized systemic cause.

Escalate to formal autonomic and neurologic evaluation when there is a reproducible blunted chronotropic response, progressive symptoms, neuropathic features, or suspicion for synucleinopathy. BMJ+1BMJOrthostatic hypotension - Symptoms, diagnosis and treatmentccjmEvaluation and management of orthostatic hypotension Use electromyography/nerve-conduction studies, skin biopsy, antibody testing, or fat-pad biopsy selectively when their result would establish a treatable or prognostically important etiology. ccjmccjmEvaluation and management of orthostatic hypotension

Do not make treatment decisions from a single blood-pressure domain. Pressor therapy may improve standing blood pressure while worsening supine hypertension, and the evidence base for many interventions remains heterogeneous with inconsistent symptom and postural-blood-pressure outcomes. The Lancet+2The LancetManagement of neurogenic orthostatic hypotension: an updateThe LancetDiagnosis and treatment of orthostatic hypotension - The LancetWolters KluwerEfficacy of treatments for orthostatic hypotension : Age and Ageing For refractory cases, define success as improved safety and function with an acceptable supine blood-pressure tradeoff.