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Myocardial ischemia lowers precordial thump efficacy: an inquiry into mechanisms using three-dimensional simulations
Weihui Li1, Peter Kohl, Natalia Trayanova
1Biomedical Engineering, Tulane University, New Orleans, Louisiana 70118, USA. nataliat@tulane.edu
Insights
Precordial thump is less effective during cardiac ischemia due to altered ion channel activity. This study explains how ischemia impacts the success of this advanced life support intervention.
Area of Science:
- Cardiovascular Electrophysiology
- Cardiac Arrest Management
- Computational Modeling
Background:
- Precordial thump is a first-line advanced life support intervention for witnessed cardiac arrest.
- Clinical evidence indicates reduced success rates of precordial thump under ischemic conditions.
Purpose of the Study:
- To investigate the electrophysiologic mechanisms underlying precordial thump's efficacy in terminating ventricular tachycardia (VT).
- To elucidate why precordial thump's success rate decreases during myocardial ischemia using a rabbit ventricular model.
Main Methods:
- Simulated precordial thump by activating mechanosensitive channels (stretch-activated cation nonselective channels, SAC-NS).
- Compared electrophysiologic effects in normoxia versus simulated ischemia, incorporating ATP-sensitive potassium (KATP) channels.
- Analyzed 10 VT cases under varying degrees of normoxia and ischemia.
Main Results:
- Precordial thump achieved a 60% success rate in normoxia and 30% in ischemia.
- In normoxia, SAC-NS opening reduced electrical heterogeneity, facilitating VT termination.
- In ischemia, KATP channel activation diminished SAC-NS effects and shortened action potentials, promoting reentry.
Conclusions:
- Provides mechanistic understanding of precordial thump's action.
- Explains the reduced clinical utility of precordial thump in ischemic cardiac arrest scenarios.
Background:
Precordial thump is the first International Liaison Committee on Resuscitation-prescribed procedure for advanced life support in witnessed cardiac arrest. Success rates vary and, according to clinical evidence, are significantly reduced under ischemic conditions.
Objectives:
The purpose of this study was to elucidate the mechanisms involved in termination of ventricular tachycardia (VT) by precordial thump and its decreased rate of success in ischemia using a three-dimensional realistic model of electrical behavior in the rabbit ventricles.
Methods:
The electrophysiologic effect of precordial thump was represented by recruitment of mechanosensitive channels in the regions affected by precordial thump. In normoxia, precordial thump opened cation nonselective stretch-activated channels (SAC-NS, reversal potential -20 mV). In ischemia, precordial thump was assumed to additionally activate ATP-sensitive K+ (K(ATP)) channels (reversal potential -95 mV). Ten randomly selected cases of VT were used, and for each case the effect of precordial thump on VT was examined for normoxia and under ischemic conditions of varying severity.
Results:
Precordial thump was found to have a 60% success rate in normoxia and 30% in ischemia. Results demonstrate that precordial thump-induced SAC-NS opening in normoxia reduced heterogeneity in transmembrane potential by partially repolarizing excited tissue and depolarizing resting myocardium, potentially causing foci of excitation that eradicate the excitable gap, thus facilitating VT termination. Decreased precordial thump efficacy in ischemia was caused by recruitment of K(ATP), which diminished the depolarizing effect of SAC-NS on resting tissue and caused pronounced action potential shortening, thus facilitating establishment of reentry.
Conclusion:
This study provides mechanistic insight into precordial thump mechanisms and its reduced clinical utility in patients with myocardial ischemia.
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