Sinus node function and conduction system after complete repair of tetralogy of Fallot.
- 1 August 1975
- journal article
- abstracts
- Published by Wolters Kluwer Health in Circulation
- Vol. 52 (2), 214-220
- https://doi.org/10.1161/01.cir.52.2.214
Abstract
Twenty-three children underwent electrophysiological studies during routine postoperative catheterization two months to five years after complete correction of tetralogy of Fallot. The aim of the study was to investigate the whole conduction system, including sinus node function, suing His bundle recordings and atrial pacing. H-V intervals were normal at rest and with pacing in twenty-two patients, including four patients with evidence of bifascicular block on the surface ECG. One patient with cardiomegaly and evidence of diffuse myocardial damage had a prolonged H-V interval but did not develop a block at this level during pacing A-H interval was slightly prolonged in four patients and normal in all others. The threshold of pacing-induced atrioventricular block ranged from 75 to 240/min and was somewhat age dependent (r = -0.55). Two patients fell below the 95% confidence limit of this regression and are considered abnormal. One returned to normal after intravenous injectionof atropine. Corrected sinus node recovery time ranged from 60 to 2000 msec. Three patients had values above 500 msec which are considered abnormal. These patients had other minor signs of sinus node dysfunction, i.e., episodes of sino-atrial block at rest or intermittent sinus bradycardia. Thus, while the His Purkinje system performed satisfactorily in all patients, sinus node dysfunctional and A-V node dysfunction were demonstrated in a few patients after correction of tetralogy of Fallot.Keywords
This publication has 14 references indexed in Scilit:
- Appraisal of sinus nodal recovery time in patients with sick sinus syndromeThe American Journal of Cardiology, 1974
- Late onset complete heart block: Newly recognized sequela of cardiac surgeryThe American Journal of Cardiology, 1972
- Changes of atrioventricular conduction with age in infants and childrenThe American Journal of Cardiology, 1972
- Evaluation of cardiac conduction in the cardiac catheterization laboratoryThe American Journal of Cardiology, 1972
- His bundle electrogram in children. Statistical correlation of the atrioventricular conduction times in children with their age and heart rate.Heart, 1972
- Dysrhythmias after mustard's operation for transposition of the great arteriesThe American Journal of Cardiology, 1972
- Atrial pacing: Its diagnostic and therapeutic applicationsProgress in Cardiovascular Diseases, 1971
- Conduction disturbances before and after surgical closure of ventricular septal defectAmerican Heart Journal, 1969
- Atrioventricular conduction in man: Effect of rate, exercise, isoproterenol and atropine on the P-R intervalThe American Journal of Cardiology, 1965
- LESS COMMONLY RECOGNIZED ACTIONS OF ATROPINE ON CARDIAC RHYTHMThe American Journal of the Medical Sciences, 1959