Wenckebach atrioventricular block (Mobitz type I) in children and adolescents

摘要: Abstract Mobitz type I atrioventricular block in children, adolescents and young adults without overt heart disease or drug intoxication has been considered less significant than II block. In highly trained athletes some nonathletes it presumed to be a benign manifestation of heightened vagal tone. Experience with 16 patients, 6 female 10 male, tends alter the concept benignity. Known onset Wenckebach varying first degree was between months 17 years age. Of eight patients followed up for 5 18 years, five have fixed complete three 1 4 two others first, second third Two required pacemaker implant. On intracardiac electrography performed seven four manifested during sinus rhythm response atrial pacing at abnormally slow rates; addition, His bundle electrograms showed A-H delay one patient, H-V both intervals patient. studied all also prolongation. The occurrence 7 children before development suggests that such is probably more common heretofore recognized may phase natural history idiopathic It often represents cardiac conduction system, which progressive, guarded prognosis.