[Influence of spontaneous ventricular premature beat coupling interval on the value of heart rate turbulence]
Related Experiment Video
Updated: Jun 28, 2026

Noninvasive Determination of Vortex Formation Time Using Transesophageal Echocardiography During Cardiac Surgery
Published on: November 28, 2018
1Interni kardiologická klinika Lékarské fakulty MU a FN Brno. kozak.milan@post.cz
Unlabelled:
The heart rate turbulence is promising marker of a sudden cardiac death. The aim of the study is to evaluate the influence of the ventricular premature beat (VPB) coupling interval on the values of turbulence onset (TO) and turbulence slope (TS) parameters in the three groups of patients--"healthy" with ventricular premature beats, pts post myocardial infarction (MI) and pts with chronic heart failure with the left ventricle ejection fraction (LVEF) < 0.35.
Patients And Methods:
382 pts were examined: healthy--149, post MI--123 and LVEF < 0.35 - 110. The distribution ofVPB was analyzed and the values ofTO and TS were evaluated according to the coupling intervals of VPB--in the intervals 00-50, 51-100 (% of RR interval) and in the intervals 34-66 and 67-100 (% of RR interval).
Results:
The coupling interval of spontaneous ventricular premature beats cause the statistically significant variability HRT values in all three groups of pts.
Conclusion:
The values of TO in the groups of post MI pts and pts with chronic heart failure are higher (risky for sudden cardiac death) after VPB with longer coupling intervals (50-100%, event. 67-100% of RR interval). The TS values are lower (risky for sudden cardiac death) after VPB with longer coupling interval, too. For evaluation of HRT we should use the VPBs with long coupling intervals.
Related Concept Videos
Disturbances in Heart Rhythm
Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...
Factors Influencing Heart Rate
Let us explore the significant factors affecting heart rate, including age, body temperature, posture, acute pain, chemical influences,...
Dysrhythmias III: Characteristics of Dysrhythmias
Cardiac Output I:Effect of Heart Rate on Cardiac Output
Cardiac output (CO) refers to the total amount of blood ejected by one of the ventricles in liters per minute (L/min). In a resting adult, CO ranges from 5 to 6 L/min, adjusting according to the body's metabolic requirements.
Effect of Heart Rate on Cardiac Output
Cardiac output adapts to metabolic demands during stress, physical activity, or illness. The autonomic nervous system regulates heart rate via the sinoatrial node. The parasympathetic nervous system decreases heart rate...
Correlation between ECG and Cardiac Cycle
A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...
Dysrhythmias IV: Characteristics of Bradyarrhythmias
