Lack of increase in stroke volume during exercise in asymptomatic adolescents in sinus rhythm after intraatrial repair for simple transposition of the great arteries.

We studied stroke volume during exercise in 12 male asymptomatic patients in sinus rhythm after intraatrial repair for d-transposition of the great arteries. Data indicate that during exercise, stroke volume did not increase in the patient group, while in control subjects stroke volume increased.