Abstract
Introduction: Gender difference is known to be associated with the occurrence of arrhythmia. However, the effects of female sex hormone on atrial electrophysiology, and on the occurrence of torsades de pointes (TdP) induced by cisapride have been unclear. Methods and Results: Two experiments were included in this study. In experiment 1, effective refractory periods (ERPs) from five epicardial atrial sites were measured before and after rapid atrial pacing at 800 beats/min for 30 minutes in dogs with pretreatment of verapamil (n = 10), 17β-estradiol (n = 10), or without pretreatment (n - 10, control group). In experiment 2, limb-lead ECG and monophasic action potentials in the left and right ventricles were recorded before and after each dose of cisapride (2 to 6 mg/kg) during different ventricular rates in dogs with (n = 9) and without (n = 14) concomitant administration of 17β- estradiol (0.3 μg/kg). After 17β-estradiol administration, there were greater atrial ERPs in the study dogs than in the control group. The atrial ERPs were shortened significantly after rapid atrial pacing, but the degree was greater in the control group than in the dogs pretreated with verapamil or 17β-estradiol. Moreover, the recovery of atrial ERPs was faster in dogs pretreated with verapamil or 17β-estradiol than in the control group. In experiment 2, cisapride prolonged the QT interval and biventricular APD90 and induced early afterdepolarizations (EADs) in a dose-dependent manner. However, dogs receiving cisapride combined with 17β-estradiol had a greater increase of ventricular repolarization and a higher incidence of EADs than those receiving cisapride only. Moreover, dogs receiving cisapride combined with 17β-estradiol (3/9, 33%) had a greater incidence of TdP than those receiving cisapride only (0/14, 0%, P <0.05). Conclusions: 17β-estradiol has a significant effect on atrial electrophysiology, which may be related to the prevention of atrial fibrillation. However, the high incidence of TdP in dogs receiving cisapride combined with 17β-estradiol suggests that the female sex hormone is an important risk factor of cisapride-induced proarrhythmia.
| Original language | English |
|---|---|
| Pages (from-to) | 587-598 |
| Number of pages | 12 |
| Journal | Journal of Cardiovascular Electrophysiology |
| Volume | 10 |
| Issue number | 4 |
| Publication status | Published - 1999 |
| Externally published | Yes |
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Keywords
- Atrial fibrillation
- Cisapride
- Estrogen
- Long QT syndrome
- Torsades de pointes
ASJC Scopus subject areas
- Cardiology and Cardiovascular Medicine
- Physiology
Cite this
Effects of 17β-estradiol on tachycardia-induced changes of atrial refractoriness and cisapride-induced ventricular arrhythmia. / Chen, Yi Jen; Lee, Shih Huang; Hsieh, Ming Hsiung; Hsiao, Chien Ju; Yu, Wen Chung; Chiou, Chuen Wang; Chen, Shih Ann.
In: Journal of Cardiovascular Electrophysiology, Vol. 10, No. 4, 1999, p. 587-598.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effects of 17β-estradiol on tachycardia-induced changes of atrial refractoriness and cisapride-induced ventricular arrhythmia
AU - Chen, Yi Jen
AU - Lee, Shih Huang
AU - Hsieh, Ming Hsiung
AU - Hsiao, Chien Ju
AU - Yu, Wen Chung
AU - Chiou, Chuen Wang
AU - Chen, Shih Ann
PY - 1999
Y1 - 1999
N2 - Introduction: Gender difference is known to be associated with the occurrence of arrhythmia. However, the effects of female sex hormone on atrial electrophysiology, and on the occurrence of torsades de pointes (TdP) induced by cisapride have been unclear. Methods and Results: Two experiments were included in this study. In experiment 1, effective refractory periods (ERPs) from five epicardial atrial sites were measured before and after rapid atrial pacing at 800 beats/min for 30 minutes in dogs with pretreatment of verapamil (n = 10), 17β-estradiol (n = 10), or without pretreatment (n - 10, control group). In experiment 2, limb-lead ECG and monophasic action potentials in the left and right ventricles were recorded before and after each dose of cisapride (2 to 6 mg/kg) during different ventricular rates in dogs with (n = 9) and without (n = 14) concomitant administration of 17β- estradiol (0.3 μg/kg). After 17β-estradiol administration, there were greater atrial ERPs in the study dogs than in the control group. The atrial ERPs were shortened significantly after rapid atrial pacing, but the degree was greater in the control group than in the dogs pretreated with verapamil or 17β-estradiol. Moreover, the recovery of atrial ERPs was faster in dogs pretreated with verapamil or 17β-estradiol than in the control group. In experiment 2, cisapride prolonged the QT interval and biventricular APD90 and induced early afterdepolarizations (EADs) in a dose-dependent manner. However, dogs receiving cisapride combined with 17β-estradiol had a greater increase of ventricular repolarization and a higher incidence of EADs than those receiving cisapride only. Moreover, dogs receiving cisapride combined with 17β-estradiol (3/9, 33%) had a greater incidence of TdP than those receiving cisapride only (0/14, 0%, P <0.05). Conclusions: 17β-estradiol has a significant effect on atrial electrophysiology, which may be related to the prevention of atrial fibrillation. However, the high incidence of TdP in dogs receiving cisapride combined with 17β-estradiol suggests that the female sex hormone is an important risk factor of cisapride-induced proarrhythmia.
AB - Introduction: Gender difference is known to be associated with the occurrence of arrhythmia. However, the effects of female sex hormone on atrial electrophysiology, and on the occurrence of torsades de pointes (TdP) induced by cisapride have been unclear. Methods and Results: Two experiments were included in this study. In experiment 1, effective refractory periods (ERPs) from five epicardial atrial sites were measured before and after rapid atrial pacing at 800 beats/min for 30 minutes in dogs with pretreatment of verapamil (n = 10), 17β-estradiol (n = 10), or without pretreatment (n - 10, control group). In experiment 2, limb-lead ECG and monophasic action potentials in the left and right ventricles were recorded before and after each dose of cisapride (2 to 6 mg/kg) during different ventricular rates in dogs with (n = 9) and without (n = 14) concomitant administration of 17β- estradiol (0.3 μg/kg). After 17β-estradiol administration, there were greater atrial ERPs in the study dogs than in the control group. The atrial ERPs were shortened significantly after rapid atrial pacing, but the degree was greater in the control group than in the dogs pretreated with verapamil or 17β-estradiol. Moreover, the recovery of atrial ERPs was faster in dogs pretreated with verapamil or 17β-estradiol than in the control group. In experiment 2, cisapride prolonged the QT interval and biventricular APD90 and induced early afterdepolarizations (EADs) in a dose-dependent manner. However, dogs receiving cisapride combined with 17β-estradiol had a greater increase of ventricular repolarization and a higher incidence of EADs than those receiving cisapride only. Moreover, dogs receiving cisapride combined with 17β-estradiol (3/9, 33%) had a greater incidence of TdP than those receiving cisapride only (0/14, 0%, P <0.05). Conclusions: 17β-estradiol has a significant effect on atrial electrophysiology, which may be related to the prevention of atrial fibrillation. However, the high incidence of TdP in dogs receiving cisapride combined with 17β-estradiol suggests that the female sex hormone is an important risk factor of cisapride-induced proarrhythmia.
KW - Atrial fibrillation
KW - Cisapride
KW - Estrogen
KW - Long QT syndrome
KW - Torsades de pointes
UR - http://www.scopus.com/inward/record.url?scp=0033113189&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0033113189&partnerID=8YFLogxK
M3 - Article
C2 - 10355701
AN - SCOPUS:0033113189
VL - 10
SP - 587
EP - 598
JO - Journal of Cardiovascular Electrophysiology
JF - Journal of Cardiovascular Electrophysiology
SN - 1045-3873
IS - 4
ER -