@entity67 may be a risk factor for @entity944 in adults, but their prognosis in @entity1 is unknown. From 1981 to 1987 104 @entity1 , mean age 13.2 years (0.2 to 37 years), had ventricular couplets on a 24-hour electrocardiogram (ECG) (Holter monitor) and on follow-up with a second Holter (mean, 2.5 years). Of the 104 @entity1 , 22 had a normal heart and 82 had an abnormal heart. @entity1 with a normal or an abnormal heart did not differ in incidence or severity of symptoms ( @entity1 with a normal heart had 17 instances of palpitations and none of @entity1163 ; @entity1 with an abnormal heart had 49 instances of palpitations, six of dizziness, and none of @entity1163 ). Number of ventricular couplets was higher in @entity1 with a normal heart (33 +/- 50/day: mean +/- 1 SD) than in those with an abnormal heart (17 +/- 15/day; p less than 0.05). Of the 22 @entity1 with a normal heart, 11 underwent an electrophysiologic study (EPS); none had inducible @entity1165 . After mean follow-up of 29.7 months, all 22 @entity1 with a normal heart were alive without @entity1165 ; 6 of 22 were treated for palpitations, with complete suppression of couplets in two. In 11 of 16 untreated @entity1 with a normal heart, ventricular couplets disappeared spontaneously. Of the 82 @entity1 with an abnormal heart, 32 had an EPS: nine (28%) had sustained @entity1165 , 16 (50%) had nonsustained @entity1165 , and seven (22%) had no inducible @entity1165 . ECG criteria and hemodynamic status were of limited value in predicting inducibility of @entity1165 .(ABSTRACT TRUNCATED AT 250 WORDS)

XXXX in the young: prognosis related to underlying substrate.

@entity1 :: ('9606', 'Species') :: ['children', 'Patients', 'patients'] @entity1165 :: ('MESH:D017180', 'Disease') :: ['ventricular tachycardia'] @entity944 :: ('MESH:D003645', 'Disease') :: ['sudden death'] @entity1163 :: ('MESH:D013575', 'Disease') :: ['syncope'] @entity67 :: ('MESH:D018754', 'Disease') :: ['Ventricular couplets']
@entity67 :: (MESH:D018754,Disease) :: ['Ventricular couplets']
