title: T wave changes in the right precordial leads in seven- and eight-year-old children during a Valsalva manoeuvre.
abstract: The T waves in the right precordial leads were analyzed in 106 eight-year-old and 90 seven-year-old unselected healthy children. Recordings during relaxation were compared with those obtained during a Valsalva manoeuvre. In the relaxed state only three children in each age group showed a positive T wave in lead V1, while during the Valsalva manoeuvre 90 of the 106 eight-year-old and 55 of the 90 seven-year-old children converted to a positive T V1. The difference is highly significant in both age groups and both sexes (p much less than 0.001). Minor changes towards more positive T V2 and T V4 were also found.
mesh_terms: D006332:Cardiomegaly / Q000175:diagnosis; D002648:Child; D003937:Diagnosis, Differential; D004562:Electrocardiography; D005260:Female; D006801:Humans; D008297:Male; D009126:Muscle Relaxation; D014636:Valsalva Maneuver