Susceptibility of hypertrophied rat hearts to ventricular fibrillation during acute ischemia
Key result
Severe hypertrophy in rats is linked to ~233% higher VF risk during acute ischemia.
- P<0.001
- n=43
Why the study?
The susceptibility of hypertrophied hearts to ventricular fibrillation during acute ischemia and the underlying electrophysiological mechanisms were not fully understood.
Comparison
Hypertrophied rat hearts vs normal rat hearts during acute ischemia
Design
Preclinical experimental study using Langendorff heart preparations
Follow-up
30 minutes of acute ischemia
Authors
Discussion
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Implication
Differences in rat ischemia models do not inform patient care; leaves open hypertrophy's role in human ventricular arrhythmias.
Structured PICO
P
Population
43 rat heart Langendorff preparations (20 normal, 9 moderately hypertrophied, 14 severely hypertrophied) subjected to 30 minutes of acute ischemia.
E
Exposure
30 minutes of acute ischemia produced by left coronary artery occlusion
C
Comparator
Normal rat hearts subjected to the same ischemic protocol
O
Outcome
Occurrence of ventricular fibrillation during 30 minutes of ischemiasurrogate
Main Result
Absolute Event Rate: 100% vs 30%
p-value: p=<0.001
Hypertrophied rat hearts demonstrate a significantly greater susceptibility to ventricular fibrillation during acute ischemia compared to normal hearts, potentially driven by dispersion of refractoriness.
Cite This Study
Kohya et al. (1988) studied Left ventricular hypertrophy and acute ischemia (n=43). Severe left ventricular hypertrophy vs. Normal hearts was evaluated on Ventricular fibrillation during 30 min of ischemia (p=<0.001). Severely hypertrophied rat hearts had a significantly higher incidence of ventricular fibrillation during acute ischemia compared to normal hearts (100% vs 30%, P<0.001).