Orthostatic Syndrome: Causes, Symptoms & Treatment
Orthostatic syndrome causes dizziness and fainting upon standing due to a sudden drop in blood pressure. It affects the elderly, adolescents, and people with certain underlying conditions.
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Orthostatic syndrome causes dizziness and fainting upon standing due to a sudden drop in blood pressure. It affects the elderly, adolescents, and people with certain underlying conditions.
What Is Orthostatic Syndrome?
Orthostatic syndrome – also known as orthostatic hypotension or orthostatic dysregulation – is a condition in which standing up from a lying or sitting position causes a rapid drop in blood pressure. This temporarily reduces blood flow to the brain and other organs, leading to symptoms such as dizziness, blurred vision, and in severe cases, a brief loss of consciousness (syncope).
Clinically, orthostatic hypotension is defined as a fall in systolic blood pressure of at least 20 mmHg or a fall in diastolic blood pressure of at least 10 mmHg within three minutes of standing up.
Causes
In a healthy person, the autonomic nervous system ensures that blood vessels constrict and the heart beats faster when standing up, thereby maintaining stable blood pressure. In orthostatic syndrome, this regulatory mechanism is impaired or delayed. Common causes include:
- Dehydration: Insufficient fluid intake, excessive sweating, or diarrhea reduces blood volume.
- Medications: Antihypertensives, diuretics, antidepressants, or certain Parkinson medications can contribute to blood pressure drops.
- Prolonged bed rest: Physical inactivity reduces the cardiovascular system ability to adapt.
- Autonomic neuropathy: Nerve damage caused by conditions such as diabetes mellitus, Parkinson disease, or chemotherapy.
- Heart conditions: Heart failure or arrhythmias can impair the pumping capacity of the heart.
- Constitutional form: Particularly common in slim adolescents and young women without any underlying disease.
- Heat and alcohol: Both cause blood vessel dilation and can worsen blood pressure drops.
Symptoms
Symptoms typically appear immediately or shortly after standing up and usually resolve upon sitting or lying back down. Common symptoms include:
- Dizziness and lightheadedness
- Blurred or darkened vision
- Headache
- Ringing in the ears (tinnitus)
- Rapid heartbeat (tachycardia)
- Nausea
- Weakness and pallor
- Brief loss of consciousness (syncope) in severe cases
Diagnosis
Diagnosis is typically established through targeted blood pressure measurement in both the lying and standing positions. Blood pressure is measured immediately after standing and again after one, two, and three minutes. Additional tests may include:
- Tilt-table test: The patient is tilted from a horizontal to an upright position while blood pressure and heart rate are continuously monitored.
- 24-hour blood pressure monitoring and Holter ECG: To detect blood pressure fluctuations and cardiac arrhythmias over a full day.
- Laboratory tests: Blood count, electrolytes, and kidney function to rule out dehydration or metabolic disorders.
- Neurological examination: If autonomic neuropathy is suspected.
Treatment
General Measures
In many cases, orthostatic syndrome can be significantly improved through simple lifestyle changes:
- Rise slowly: Sit up first, wait briefly, then stand.
- Stay well hydrated: Aim for at least 1.5 to 2 liters per day, more in hot weather.
- Regular physical activity to improve circulatory regulation (e.g., aerobic exercise, swimming).
- Contrast showers and brush massages to train blood vessel tone.
- Compression stockings or abdominal binders to reduce venous pooling in the legs.
- A diet slightly higher in salt (as advised by a doctor) to increase blood volume.
- Sleeping with the head of the bed slightly elevated (10–20 cm).
Medication
If general measures are insufficient, pharmacological therapy may be considered. Commonly used agents include:
- Fludrocortisone: A mineralocorticoid that promotes sodium reabsorption in the kidneys, thereby increasing blood volume.
- Midodrine: A vasoconstrictive agent (alpha-1 agonist) that stabilizes blood pressure in the upright position.
- Droxidopa: Used in specific cases of neurogenic orthostatic hypotension.
Treatment selection always depends on the underlying condition, the patient's age, and individual health status.
References
- Freeman R et al. - Consensus statement on the definition of orthostatic hypotension, neurally mediated syncope and the postural tachycardia syndrome. Clinical Autonomic Research, 2011; 21(2): 69–72.
- Lahrmann H, Cortelli P, Hilz M et al. - EFNS guidelines on the diagnosis and management of orthostatic hypotension. European Journal of Neurology, 2006; 13(9): 930–936.
- Kaufmann H - Consensus statement on the definition of orthostatic hypotension, pure autonomic failure, and multiple system atrophy. Neurology, 1996; 46(5): 1470.
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