Differences of hemodynamic changes during supraventricular tachycardias: simulation of AVRT and AVNRT in dogs.
- Author:
Eun Ju CHO
1
;
Jae Hyung KIM
;
Tai Ho RHO
;
Seung Won JIN
;
Hee Yeol KIM
;
Man Young LEE
;
Chong Jin KIM
;
Jang Seong CHAE
;
Soon Jo HONG
;
Kyu Bo CHOI
Author Information
1. Department of Internal Medicine, St. Paul's Hospital, Catholic University College of Medicine, Seoul, Korea.
- Publication Type:Original Article
- Keywords:
AVNRT;
AVRT;
Atrial tachycardia;
Hemodynamic
- MeSH:
Animals;
Arterial Pressure;
Cardiac Output;
Dogs*;
Heart Ventricles;
Hemodynamics*;
Pulmonary Wedge Pressure;
Tachycardia;
Tachycardia, Atrioventricular Nodal Reentry;
Tachycardia, Supraventricular*
- From:Korean Journal of Medicine
2002;62(1):35-41
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
BACKGROUND: Tachyarrhythmias have various clinical features according to their tachycardia rates, systolic function of the left ventricle, the origin site and the mechanisms. Atrioventricular nodal reentrant tachycardia (AVNRT) and atrioventricular reentrant tachycardia (AVRT) might cause different hemodynamic changes due to their different mechanisms. METHODS: To evaluate the hemodynamic differences of supraventricular tachycardias, atrial tachycardia (atrial pacing with AOO mode, 180/min, group I), AVRT (VA pacing interval 80 msec with DOO mode, 180/min, group II) and AVNRT (VA pacing interval 0 msec, 25 msec with DOO mode, 180/min, group III) were simulated in eleven dogs. Hemodynamic parameters were systemic arterial pressure including systolic, mean and diastolic arterial pressure (SAP, MAP, DAP respectively), mean pulmonary arterial wedge pressure (MPAWP) and cardiac output (CO). RESULTS: The MAP was highest in group I (87.0+/-20.4 mmHg) and decreased with decreasing VA interval of no significance. The SAP was higher in group II (109.8+/-22.6 mmHg) than in group III (95.3+/-27.1 mmHg) (p<0.05). The level of MPAWP had no significant differences among three groups and showed no peculiar pattern with changes of VA interval. The CO was higher in group I (1.18+/-0.32 L/min) than in other two groups with significant difference (p<0.01) and decreased with shortening of VA interval without significance. CONCLUSION: Above results suggested that the AVRT and AVNRT have different effects on hemodynamic changes, those from different timing of atrial contraction, especially on SAP and CO. So hemodynamic compromise during tachycardia could be more severe in AVNRT than in AVRT inspite of their similar QRS morphology and tachycardia rate.
