Objective:To study the prevalence of pre-excitation and Wolff-Parkinson-White (WPW) syndrome in adolescents in Beijing area.
Methods: A total of 19 484 adolescents at the age of (15-20) years from Xicheng district of Beijing and the freshmen from Peking University were enrolled for our survey; 12-lead electrocardiography (ECG) screening was conducted and the diagnosis, classification of pre-excitation, WPW syndrome were recorded. The follow-up study was performed in relevant patients.
Results: There were 19 389 qualiifed ECG obtained, among them, 30 (0.15%) patients with ventricular pre-excitation and WPW syndrome identiifed including 17 male (0.17%) and 13 (0.13%) female, the prevalence between male and female was similar (χ2=0.495,P>0.05). There were 6/19389 (0.03%) patients with palpitation and 2 (0.01%) documented by super-ventricular tachycardia. There were 16/30 (53.33%) patients with type A and 14(46.7%) with type B ventricular pre-excitation, the prevalence between male and female was similar (χ2=4.693,P>0.05). The patients were followed-up at the mean of 2.5 (1.5-3) years and no malignant arrhythmia events occurred.
Conclusion: In this cohort survey, prevalence of pre-excitation and WPW syndrome is about 0.15% in adolescents from (15-20) years in Beijing area; the prevalence is similar between male and female subjects.

Objective To explore the effect of sodium phosphocreatine (SPC)on myocardi-al protection of patients with paroxysmal supraventricular tachycardia (PSVT)by treatment of radiofre-quency catheter ablation (RFCA).Methods 40 patients with PSVT by treatment of RFCA were ran-domly divided into SPC group (daily intravenous drip of 1 g SPC in 250 ml of normal saline,n =20) and NS group (the same volume of NS only,n =20).Assessment parameters that serum creatine ki-nase (CK),creatine kinase isoenzyme-MB (CK-MB)and cardiac troporin T (cTn T)were temporally investigated from pre-to 72 h after RFCA.Additionally,SPC-related adverse events were recorded. Results Compared with NS group,the overall and peak serum CK,CK-MB and cTn T significantly decreased in SPC group (P <0.05)during 24 hours after RFCA.No SPC-related adverse events were observed.Conclusion SPC shows a myocardial protective effect in patients with PSVT by treatment of RFCA.

Objective To explore the effect of sodium phosphocreatine (SPC)on myocardi-al protection of patients with paroxysmal supraventricular tachycardia (PSVT)by treatment of radiofre-quency catheter ablation (RFCA).Methods 40 patients with PSVT by treatment of RFCA were ran-domly divided into SPC group (daily intravenous drip of 1 g SPC in 250 ml of normal saline,n =20) and NS group (the same volume of NS only,n =20).Assessment parameters that serum creatine ki-nase (CK),creatine kinase isoenzyme-MB (CK-MB)and cardiac troporin T (cTn T)were temporally investigated from pre-to 72 h after RFCA.Additionally,SPC-related adverse events were recorded. Results Compared with NS group,the overall and peak serum CK,CK-MB and cTn T significantly decreased in SPC group (P <0.05)during 24 hours after RFCA.No SPC-related adverse events were observed.Conclusion SPC shows a myocardial protective effect in patients with PSVT by treatment of RFCA.