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To observe whether ventricular rate existing circadian pattern in persistent atrial fibrillation (AF).
Two hundred and nine inpatients with persistent AF underwent 24-hour dynamic ECG (DECG) monitoring. An episode ECG was picked/ selected every 30 minutes as the ECG sample. Each episode was 1 minute length. The selected episode at 10am was defined as casual ECG (CECG). Grouping criteria based on 10am CECG were based on f-wave amplitude, divided into coarse (group 1) and fine AF (group 2); according to VR, into slow (group A), controlled (group B) and fast AF (group C). Circadian VR, comparison of VR between groups, coincident estimation of f-wave and VR of 24-hour DECG with CECG were analyzed. Simple statistics, t-test, ANOVA were used in the present study.
All the AF groups showed a similar circadian VR pattern, which rose in the morning and evening, and fell at noon and during the nighttime. The hourly maximum average VR values occurred in the morning. The coincidence degree of 24-hour DECG f-wave amplitude with CECG showed that group 1 was higher than group 2 (89.22±15.21% vs 80.41±26.41%). The VR coincidence degree of 24-hour DECG with CECG revealed that group B was higher than group A (82.33±18.14% vs 56.4±30.35%) and group C (82.33±18.14% vs 39.24±30.46%). All p<0.05.
Persistent AF presents a circadian VR pattern with double peak and trough. The lower coincidence degree of 24-hour DECG with CECG appears in fast and slow persistent AF suggesting that the 24-hour DECG monitoring in persistent AF is necessary.