The Changes Of Ventricular Late Potentials With Vasovagal Syncope Of Vasodepressor Response In Children

Objective To investigate the changes of ventricular late potentials (VLP) with vasovagal syncope of vasodepressor response (VVS-V) in children.Methods From2006July to2013January in the Second Xiangya Hospital of Central South University,184children (Their ages were4to14years old. The average age was10.54±2.15years old) had been diagnosed VVS-V by the tilt table test (HUTT) as study group; male85cases, the average age of (10.85±2.01) years old, female99cases, mean age (10.27±2.24) years old;105healthy children were matched as controls. All subjects underwent VLP examination, and investigate the difference in HR, TQRS, RMS40, LAS40between the study group and the control group;After the treatment of VVS-V children (35.98±14.93) d and (138.07±58.4) d review VLP, Compare the differences before and after treatment.Results (1)The study group compared with control group children, heart rate (HR) decreased significantly(83.96±12.27beats/min vs87.28±13.75beats/min, t=-2.113, P=0.035); the total QRS time (TQRS) prolonged obviously (84.89±12.05ms vs81.21±8.23ms, t=3.070, P=0.002); root mean square plant (RMS40) were significantly prolonged (28.73±7.23μV vs26.89±7.36μV,t=2.059,P=0.041); high frequency and low amplitude limit (LAS40) was significantly prolonged (62.43ms±19.17vs56.79±1.83ms, t=2.442, P=0.015).(2)55children in study group reviewed of VLP after (35.98±14.93) days treatment, there were no significant changes in HR (82.38±10.31beats/min vs81.69±11.48beats/min, t=0.380, P=0.705), TQRS (87.04±14.59ms vs85.33±17.06ms, t=0.098, P=0.277), RMS40(28.16±7.49μV vs27.96±7.63μV, t=0.241, P=0.810) and LAS40(56.34±22.57ms vs61.47±23.32ms, t=-1.830, P=0.073);14children in study group reviewed of VLP after (138.07±58.4) days treatment, there were no significant differences in HR (83.29±7.93beats/min vs85.00±12.40beats/min, t=-0.735,P=0.475), TQRS (91.71±22.56ms vs85.71±7.98ms, t=1.023, P=0.325), RMS40(29.14±5.63μV vs28.21±6.12μV, t=0.695, P=0.499) and LAS40(54.49±20.25ms vs54.63±20.75ms, t=-0.025, P=0.980).Conclusions VVS-V children compared to healthy controls, HR is reduced, TQRS, RMS40, LAS40significantly prolong. There were no significant difference observed in HR, TQRS, RMS40, LAS40before and after treatment in VVS-V children.