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Mechanisms of fixed coupled ventricular ectopic complexes.

C W Vellani, A Murray

Cardiovascular Research

|July 1, 1983

Summary

Fixed coupled ventricular ectopic complexes (VECs) often show parasystole and synchrony with sinus rhythm. Some VECs arise from ventricular re-excitation or escape rhythms, not fixed coupling.

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Area of Science:

Cardiology
Electrophysiology
Medical Devices

Background:

Ventricular ectopic complexes (VECs) are common arrhythmias.
Understanding the mechanisms of fixed coupled VECs is crucial for diagnosing and managing cardiac conditions.
Previous studies have explored VEC mechanisms, but fixed coupling requires further investigation.

Observation:

Analysis of 4500 fixed coupled VECs in 7 patients using ECG monitoring and a specialized computer.
Over 80% of VECs exhibited coupling intervals within a narrow 120 ms range.
Parasystole was observed in five patients, with varying ectopic periods relative to the sinus period.

Findings:

Fixed coupling intervals varied between subjects, with no specific diastolic phase identified for fixation.
In parasystolic VECs, inter-ectopic intervals adjusted to multiples of the sinus period, indicating synchrony.
Two patients showed VECs likely due to ventricular re-excitation (early diastole) or escape rhythms (late diastole).

Implications:

The findings suggest that fixed coupling in VECs can be influenced by the synchronizing effect of sinus rhythm on parasystolic rhythms.
Identifying different VEC mechanisms, including re-excitation and escape rhythms, is important for accurate diagnosis.
Further research into VEC mechanisms can lead to improved therapeutic strategies for ventricular arrhythmias.

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