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Temporal stability and precision of ventricular defibrillation threshold data.

C F Babbs, S J Whistler, G K Yim

The American Journal of Physiology

|November 1, 1978

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Ventricular defibrillation threshold is a stable measure. This study found that electrical ventricular defibrillation (EVD) threshold current remained consistent over time in dogs, though delivered energy slightly decreased.

Area of Science:

Cardiology
Electrophysiology
Veterinary Medicine

Background:

Electrical ventricular defibrillation (EVD) is crucial for treating life-threatening arrhythmias.
Understanding the stability and precision of EVD threshold measurements is essential for clinical application and research.
Previous studies have not fully established the long-term stability of EVD thresholds in vivo.

Purpose of the Study:

To determine the stability and precision of transchest electrical ventricular defibrillation (EVD) threshold measurements.
To assess the impact of repeated measurements over time on EVD threshold values.
To evaluate the reliability of EVD threshold as a physiological parameter.

Main Methods:

Over 200 EVD threshold measurements were performed in 15 pentobarbital-anesthetized dogs.

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Threshold was determined using successive shocks of diminishing current (10% decrements).

Measurements were taken at varying intervals (60, 15, and 5 minutes) over extended periods (8, 5, and 1 hour).

Main Results:

No significant change in mean threshold current was observed over time.
Threshold delivered energy decreased by approximately 10% within the first hour due to reduced transchest impedance.
Intra-animal variability was 11% for peak current and 22% for delivered energy.

Conclusions:

Ventricular defibrillation threshold is a stable physiological parameter.
EVD threshold can be measured with reasonable precision.
The findings support the use of EVD threshold measurements in research and potentially clinical settings.