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[Course of contraction during physiological and ventricular pacemaker stimulation]
Klinische Wochenschrift
|December 3, 1984
Summary
Phase imaging accurately identifies cardiac activation patterns during various pacing modes. Ventricular pacing (VVI) can lead to abnormal activation, potentially increasing myocardial oxygen demand.
Area of Science:
- Cardiology
- Nuclear Medicine
- Biomedical Imaging
Background:
- Cardiac pacing is crucial for managing arrhythmias.
- Understanding pacing-induced activation patterns is vital for optimizing cardiac function.
- Gated radionuclide ventriculography offers insights into dynamic cardiac processes.
Purpose of the Study:
- To evaluate cardiac activation patterns using phase imaging in patients with different pacing modes.
- To assess the reliability of phase analysis in identifying pacing-induced abnormalities.
Main Methods:
- Phase imaging of gated radionuclide ventriculography was employed.
- Patients with sinus rhythm and various pacing modes (VVI, AAI, DDD) were studied.
- Ventricular activation patterns were analyzed based on phase distribution.
Main Results:
- Sinus rhythm, AAI, and DDD pacing showed homogeneous ventricular phase distribution.
- VVI pacing frequently resulted in left bundle branch block-like activation (21/28 patients).
- Simultaneous biventricular activation was observed in some VVI patients (7/28), with potential implications for myocardial oxygen demand.
Conclusions:
- Phase analysis is a reliable method for assessing cardiac activation during pacing.
- VVI pacing can induce abnormal ventricular activation patterns, potentially affecting cardiac efficiency.
- Further investigation into the clinical significance of VVI-induced asynchronous contraction is warranted.