Key result
Sex-specific differences in guinea pig cardiac electrophysiology observed in vivo did not persist ex vivo, showing similar APD, CaD, conduction velocity, and alternans susceptibility between sexes.
Why the study?
It was unknown whether the guinea pig heart has intrinsic sex-specific differences in cardiac electrophysiology.
Does sex affect ex vivo cardiac electrophysiology in a guinea pig model?
Does sex affect ex vivo cardiac electrophysiology in a guinea pig model?
Sex-specific differences in guinea pig cardiac electrophysiology are likely driven by the in vivo environment rather than intrinsic electrical properties of the heart.
Sex differences in guinea pig ECGs likely reflect extrinsic factors; leaves open intrinsic properties in human electrophysiology.
We evaluated whether the guinea pig heart has intrinsic sex-specific differences in cardiac electrophysiology. Although we observed sex-specific differences in in vivo ECGs, these differences did not persist ex vivo. Using a whole heart model, we observed similar APD, CaD, conduction velocity, and alternans susceptibility in males and females. We conclude that sex-specific differences in guinea pig cardiac electrophysiology are likely influenced by the in vivo environment and less dependent on the intrinsic electrical properties of the heart.
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Haq et al. (2022) studied this question. Sex (female) vs. Male was evaluated on Ex vivo cardiac electrophysiology (APD, CaD, conduction velocity, and alternans susceptibility). Sex-specific differences in guinea pig cardiac electrophysiology observed in vivo did not persist ex vivo, showing similar APD, CaD, conduction velocity, and alternans susceptibility between sexes.
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