Stretch-induced syncope: An examination of a rarely recognized condition

Area of Science:

• Neurology
• Cardiology
• Autonomic Nervous System Disorders

Background:

• Stretch-induced syncope is an uncommon situational syncope.
• It is triggered by stretching upper-back, neck, and shoulder muscles.
• Previous theories involved vertebral artery compression or baroreceptor stimulation.

Purpose of the Study:

• To review the literature on stretch-induced syncope.
• To elucidate the underlying mechanisms of stretch-induced syncope.
• To guide diagnosis and management of stretch-induced syncope.

Main Methods:

• Systematic literature review of 133 publications across major databases.
• Analysis of 30 patient cases from 12 identified studies.
• Review of recent simulated stretch testing data.

Main Results:

• Stretch-induced syncope episodes were triggered by neck hyperextension and upper-back stretching.
• Recent data suggest a neural reflex-mediated mechanism with vasodepressor response and diminished compensatory tachycardia.
• No pharmacologic therapy has proven effective.

Conclusions:

• Stretch-induced syncope is best explained by a neural reflex, not mechanical obstruction.
• Diagnosis requires careful history and autonomic testing with symptom reproduction.
• Management focuses on patient education and avoidance of provoking maneuvers.