THE ANALYSIS OF RR-LORENZ PLOT IN THE RESEARCH OF SINUS RHYTHM WITH LONG RR INTERVAL
Aims: To discuss the advantage of RR-Lorenz plot (RR-LP) in the research of sinus rhythm with long RR interval.
Methods: The RR-Lorenz plots of 308 patients with long RR interval (RR interval greater than 1500 ms) showed in ambulatory electrocardiogram(AECG) were analyzed retrospectively.
Results : RR-Lorenz plot(RR-LP) of sinus bradycardia with arrhythmia showed the single distributing area with 1500 ms for the origin of transverse and longitudinal axis; B line slope was 1, tilt angle was 45°. RR-Lorenz plot(RR-LP) of repeated transient sinus arrest, second degree type II°sino-atrial block, type II°atria- ventricular block( EAVB), un-passed atrial premature beats(APB) showed the special four distributing area; B line slope was (0.512 ± 0.011), tilt angle of (23.04 ± 0.495); The others of that were 0.6 (27°); (0.571 ± 0.213), (25.69 ± 9.585); (0.502 ± 0.012), (22.59 ± 0.54); as the basis of sinus rhythm was relatively quick with atrio-ventricular functional escape beat, ventricular escape or escape rhythm, RR-Lorenz plot(RR-LP) would show special four distributing area. RR-Lorenz plot(RR-LP) of premature beat showed special four regional distributing area; B line slope for atrial premature beat was (0.379 ± 0.116), tilt angle of (17.06 ± 5.22); B line slope for ventricular premature beat was (0.067 ± 0.053), tilt angle of (3.015 ± 2.385).The pseudo-long RR interval without specific regularity.
Conclusions: RR-Lorenz plot (RR-LP) of sinus rhythm with different mechanism long RR interval have specific morphology and distribution feature, rapidity, visibility and integrity of RR-Lorenz plot(RR-LP) make up the limitations of conventional electrocardiographic, RR- Lorenz plot(RR-LP) can found abnormal in a plane, which provide a reliable diagnosis for repeated occurrence of short RR interval.