To explore the application value of dynamic electrocardiogram in coronary slow flow phenomenon(CSFP)
Objective To explore the application value of dynamic electrocardiogram in coronary slow flow phenomenon(CSFP).Methods This study included 124 patients(72 males;average age 65.72±9.83 years)who underwent coronary angiography.Based on blood flow velocity,patients with CSFP identified during the examination were included in the observation group(n=36),while the control group(n=88)consisted of patients without significant slow flow.CSFP patients were given routine electrocardiogram and dynamic electrocardiogram examinations,and the diagnostic effectiveness was compared.To compare the heart rate variability(HRV)indexes between the two groups and explore the correlation between HRV and CSFP.Results The detection rate of atrial premature beats,tachycardias,and ST segment changes on ambulatory electrocardiogram was higher than that on conventional electrocardiogram(P＜0.05).The maximum heart rate and heart rate variability index SDNN(standard deviation of normal-to-normal intervals)and PNN50(percentage of RR intervals differing more than 50ms from the preceding one)in the coronary slow flow group were lower than those in the coronary normal flow group,and the difference was statistically significant(P＜0.05).Logistic regression analysis showed that maximum heart rate,SDNN,and PNN50 were independent risk factors for CSFP.Conclusions HRV is associated with slow flow,and has some predictive value for CSFP.In the screening process of CSFP patients,dynamic electrocardiogram has obvious advantages,such as high detection rate,simple operation,repeatability,and high clinical application value.
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