Key result
Stretching with neck hyperextension can induce syncope in adolescents via a mechanism likely involving vertebral artery compression and a familial tendency to faint, rather than simply Valsalva.
Population
6 adolescents with syncope induced by stretching with the neck hyperextended, and controls
Comparison
Stretching and Valsalva maneuvers vs Controls
Design
Case-control
Authors
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Prompts neck-position history in adolescent syncope evaluation; Level 4 data leave open causal confirmation and prevalence.
Stretch syncope in adolescents does not appear to be driven solely by Valsalva-induced cardiovascular responses, but may involve vertebral artery compression.
Pelekanos et al. (1990) studied this question. Stretching with neck hyperextension can induce syncope in adolescents via a mechanism likely involving vertebral artery compression and a familial tendency to faint, rather than simply Valsalva.
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