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Department of Pediatrics, Dalhousie University, Izaak Walton Killam Children's Hospital, Halifax, Nova Scotia, Canada.
We describe 6 adolescents with syncope induced by stretching with the neck hyperextended. Studies of the cardiovascular responses to stretching and Valsalva in these patients were the same as controls, indicating that the mechanism is not simply Valsalva but may also involve vertebral artery compression coupled with a familial tendency to faint.
Address correspondence and reprint requests to Dr. Peter R. Camfield, Izaak Walton Killam Children's Hospital, Box 3070, Halifax, Nova Scotia, B3J 3G9, Canada.
Presented in part at the 17th National Meeting of the Child Neurology Society, Halifax, Nova Scotia, Canada, September 1988.
Dr. Pelekanos is the holder of a Board of Governor's Fellowship, The Izaak Walton Killam Children's Hospital.
Received August 3, 1989. Accepted for publication in final form September 22, 1989.
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