ABSTRACT
The P wave of electrocardiogram is the atrial depolarization wave, which represents the atrial excitement.P waves are associated with many diseases, which can be used as diagnostic standard and prognostic index, and may have significant clinical value.Neurally-mediated syncope(NMS)is primarily mediated by autonomic abnormalities or autonomic dysfunction.NMS is also the most common type of syncope in children and adolescents.Many studies have shown that P waves can provide a lot of information related to NMS.In patients with NMS, P wave duration, P wave dispersion and P wave amplitude are statistically significant.Therefore, P wave of electrocardiogram may become an important ECG indicator for the prognosis of NMS in children and adolescents.Here we review the relationship between P wave of electrocardiogram and prognosis of NMS in children and adolescents.
ABSTRACT
The occurrence of sudden cardiac death(SCD)in children is a rare but devastating event.Children′ SCD occurs mostly outside the hospital, with its strong suddenness and low success rate of treatment, causing serious consequences to both the families and society.Compared with other fatal incidents in children(such as car accidents, drowning), SCD incidents in children attracted more attention.Children′ SCD has been regarded as an unsolved major problem in clinical cardiology, emergency medicine and public health.The key to reducing the incidence of SCD in children is early detection and early prevention.With the continuous progress in the field of inspection technology, the understanding of electrocardiogram T-wave is getting deeper and deeper, and T-wave has become an important indicator for predicting SCD.This paper will review the research progress of T-wave and SCD in children.
ABSTRACT
Objective@#To investigate the changes in ventricular late potentials (VLP) in children and adolescents with postural tachycardia syndrome (POTS).@*Methods@#One hundred and forty-four children and adolescents diagnosed as POTS by using the head-up tilt test (HUTT) in Second Xiangya Hospital of Central South University from January 2012 to March 2019 were selected as POTS group, their age ranged 4 to 16 years old[(11.03±2.34)years old], there were 65 boys and 79 girls.Ninety-one healthy children and adolescents matched by age and gender[aged 4-16 (11.22±1.68) years old, there were 50 boys and 41 girls]were selected as the healthy control group.VLP was measured by SR-1000A ECG automatic analyzer (Boai, Guangdong, China).@*Results@#Compared with the healthy control group, the prevalence of positive VLP in the POTS group increased [ 11.1%(16/144 cases)vs.1.1%(1/91cases)], and the difference was statistically significant(χ2= 6.904, P<0.01); the heart rate in the POTS group increased compared with that in the healthy control group[82.0 (74.0-95.0) times/min vs.78.0 (71.0-86.0) times/min], and the difference was statistically significant(Z=-2.265, P<0.05); the low-amplitude signal(LAS40) in the POTS group prolonged compared with that in the healthy control group[23.0 (17.0-31.0) μV vs.19.0 (13.0-25.0) μV], and the difference was statistically significant(Z=-4.114, P<0.01); root mean square amplitude(RMS40) increased compared with that in the healthy control group[61.3 (34.4-79.1) ms vs.52.0 (38.8-64.5) ms], and the difference was statistically significant (Z=-2.469, P<0.05). There was no statistically significant difference in total QRS time (TQRS) between 2 groups [86.0 (76.0-97.5) ms vs.87.0 (81.0-94.0) ms, Z=-0.007, P>0.05].@*Conclusions@#The positive rate of VLP is increased of children and adolescents with POTS.It suggests that there is an abnormal cardiac electrical activity in children and adolescents with POTS.
ABSTRACT
Objective To investigate the changes in ventricular late potentials (VLP) in children and adolescents with postural tachycardia syndrome (POTS).Methods One hundred and forty-four children and adolescents diagnosed as POTS by using the head-up tilt test (HUTT) in Second Xiangya Hospital of Central South University from January 2012 to March 2019 were selected as POTS group,their age ranged 4 to 16 years old [(11.03 ± 2.34) years old],there were 65 boys and 79 girls.Ninety-one healthy children and adolescents matched by age and gender [aged 4-16 (11.22 ± 1.68) years old,there were 50 boys and 41 girls] were selected as the healthy control group.VLP was measured by SR-1000A ECG automatic analyzer (Boai,Guangdong,China).Results Compared with the healthy control group,the prevalence of positive VLP in the POTS group increased [11.1％ (16/144 cases)vs.1.1％ (1/91 cases)],and the difference was statistically significant(x2=6.904,P ＜ 0.01);the heart rate in the POTS group increased compared with that in the healthy control group [82.0 (74.0-95.0) times/min vs.78.0 (71.0-86.0) times/min],and the difference was statistically significant (Z =-2.265,P ＜ 0.05);the low-amplitude signal (LAS40) in the POTS group prolonged compared with that in the healthy control group[23.0 (17.0-31.0) μV vs.19.0 (13.0-25.0) μV],and the difference was statistically significant (Z =-4.114,P ＜ 0.01);root mean square amplitude(RMS40) increased compared with that in the healthy control group [61.3 (34.4-79.1) ms vs.52.0 (38.8-64.5) ms],and the difference was statistically significant (Z =-2.469,P ＜ 0.05).There was no statistically significant difference in total QRS time (TQRS) between 2 groups [86.0 (76.0-97.5) ms vs.87.0 (81.0-94.0) ms,Z =-0.007,P ＞ 0.05].Conclusions The positive rate of VLP is increased of children and adolescents with POTS.It suggests that there is an abnormal cardiac electrical activity in children and adolescents with POTS.