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Relationship between TpR index and symptoms of idiopathic outflow tract premature ventricular contraction |
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Abstract Objective To analyze the relationship between arrhythmic symptoms of the patients with outflow tract premature ventricular contraction(PVC) and characteristics of surface electrocardiogram(ECG), and to explore its clinical significance. Methods According to the existence of PVCrelated arrhythmic symptoms, 97 outflow tract PVC patients were divided into two group: symptomatic group(60 cases) and asymptomatic group(37 cases). The examination of echocardiography and standard 12 lead surface ECG were performed on all the patients. The measured parameters included PVC burden, the width of PVC complex, coupling interval, index of PVC coupling interval(PVC coupling interval÷sinus RR cycle×100%), TpR interval of PVC(the duration from sinus T peak before PVC to the starting point of PVC) and TpR index of PVC(TpR interval of PVC÷sinus TpR interval×100%). The relationship between the above measured parameters and arrhythmic symptoms was analyzed. Results In the symptomatic group, the index of PVC coupling interval, TpR interval of PVC and TpR index of PVC were significantly higher than those in the asymptomatic group(P<0.05). However, there was no statistically significant difference of PVC burden, origin of PVC or other ECG parameters between the two groups. Spearman correlation analysis showed that PVCrelated symptoms were significantly positively correlated with the index of PVC coupling interval(r=0.324, P<0.05), TpR interval of PVC(r=0.272, P<0.05) and TpR index of PVC(r=0.457, P<0.05). Conclusion PVCrelated symptoms are associated with higher index of PVC coupling interval and TpR index for patients with outflow tract PVC. Those symptoms are related to the delayed emergence of PVC, which is helpful in the control of PVC clinically.
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