Effect of electrophysiologic character of ventricular premature beat on heart rate turbulence.
Heart rate turbulence (HRT) has been described as a predictor of high-risk patients with cardiac diseases. The purpose of this study is to determine how the degree of prematurity of a ventricular premature beat (VPB%) and retrograde ventriculoatrial (VA) conduction of VPBs affect HRT. We studied 30 patients without organic heart disease. We calculated turbulent slope (TS) and turbulent onset (TO) from VPBs induced by programmed stimulation from the right ventricular apex. TS was inversely and TO was positively correlated to VPB%. Without retrograde VA conduction of VPBs, TS was inversely and TO was positively correlated to VPB%. In VPBs with retrograde VA conduction, there were no significant correlations between TO and TS with VPB%. In conclusion, TS and TO calculated from VPBs with different degrees of prematurity varied widely. Both VPB% and characteristics of retrograde VA conduction may affect HRT.
Lee
Kun-Tai
KT
Department of Internal Medicine, Section of Cardiology, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan. kuntai.lee@msa.hinet.net
Lai
Wen-Ter
WT
Chu
Chin-Sheng
CS
Yen
Hsueh-Wei
HW
Voon
Wen-Choi
WC
Sheu
Sheng-Hsiung
SH
D000328:Adult; D001145:Arrhythmias, Cardiac / Q000503:physiopathology*; D022062:Electrophysiologic Techniques, Cardiac; D005260:Female; D006329:Heart Conduction System / Q000503:physiopathology; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D008297:Male; D018879:Ventricular Premature Complexes / Q000503:physiopathology