Multivariate Analysis of the Determinant Factors Related to Syncope During Paroxysmal Supraventricular Tachycardia.

Objective: The purposes of this study were to investigate the determinant factors associated with syncope during paroxysmal supraventricular tachycardia. Methods:Three hundred and ten consecutive patients with at least two episodes documented spontaneous supraventricular tachycardia were included in this study, 133 women (43%) and 177 (57%) men with a mean age of 43±16 years. It consisted of 63 patients with atrioventricular (AV) nodal reentrant tachycardia, 166 AV reentrant tachycardia due to concealed accessory pathway and 81 AV reentrant tachycardia caused by manifest accessory pathway. Data were collected from chart reviews of 310 patients with SVT, 14% of the subjects (42 of 310) reported at leaste 1 episode of syncope which was preceded by palpitations. Multivariate analysis included sex, age, tachycardia cycle length, history, type of tachycardia. The tachycardia mechanism was based on the elecrophysiologic studies and radiofrequency ablation results.Results: All cases are classified with two groups, about syncope (n1) and non syncope (n2). cases: n1=42, n2=268; sex: femal n126 ,n2=107; age: (year) n1=46±16, n2=41±17; tachycardia cycle length (bpm): n1= 177±30, n2= 184±30; history (year): n1= 10±9, n2=10 ±9; AVNRT: n1=14, n2=49; WPW: n1=10, n2=71, AVRT: n1=18, n2=148.Conclusion: We found atrioventriocular nodal reentrant tachycardia (p=0.02) and femal (p=0.007) are independent risk factor related to syncope during supraventricular tachycardia, and dose not predict a more rapid tachycardia rate (p=0.08), not age (p=0.083), not history (p=0.7).