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Effect of acute ventricular pressure changes on QRS duration
D A Sideris1, S T Toumanidis, K Kostopoulos
1Department of Clinical Therapeutics, Medical School of Athens University, Ioannina, Greece.
Journal of Electrocardiology
|July 1, 1994
Summary
Acute changes in ventricular pressure significantly impact QRS duration, affecting ventricular conduction. This finding clarifies mechanisms of ventricular pressure-related arrhythmogenesis and cardiac electrophysiology.
Area of Science:
- Cardiology
- Cardiac Electrophysiology
- Physiology
Background:
- Ventricular pressure fluctuations can influence cardiac electrical activity.
- Understanding the link between ventricular pressure and QRS duration is crucial for arrhythmogenesis research.
Purpose of the Study:
- To investigate the acute effects of altered ventricular pressure on QRS duration.
- To elucidate the electrophysiological mechanisms underlying ventricular pressure-related arrhythmogenesis.
Main Methods:
- Acute changes in ventricular pressure were induced in 14 dogs using an open-air reservoir system.
- Ventricular pressure levels were manipulated via arterial transfusion-bleeding, with and without metaraminol.
- QRS duration was measured at a paper speed of 200 mm/s under controlled ventricular pressures.
Main Results:
- A significant positive correlation was observed between left ventricular pressure and QRS duration across all subjects.
- An average increase of 100 mmHg in ventricular pressure corresponded to an approximate 18% change in QRS duration.
- Acute elevation of ventricular pressure was found to impair ventricular conduction velocity.
Conclusions:
- Acute ventricular pressure elevation adversely affects ventricular conduction.
- Impaired ventricular conduction due to pressure changes may be a contributing factor to ventricular pressure-related arrhythmogenicity.
- This study provides insights into the electrophysiological consequences of acute ventricular pressure variations.