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Mice display sex differences in halothane-induced polymorphic ventricular tachycardia.

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Male and female mouse hearts show similar basic electrophysiology but differ in response to halothane. Female hearts experienced longer drug-induced polymorphic ventricular tachycardia (PVT), suggesting sex-specific responses.

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Area of Science:

  • Cardiovascular Physiology
  • Cardiac Electrophysiology
  • Pharmacology

Background:

  • Molecularly engineered mice are crucial models for cardiovascular disease research.
  • Limited understanding exists regarding sex-based differences in mouse heart electrophysiology.

Purpose of the Study:

  • To investigate the influence of biological sex on drug-induced polymorphic ventricular tachycardia (PVT) in mouse hearts.
  • To identify sex-specific electrophysiological responses to halothane.

Main Methods:

  • Utilized Langendorff-perfused male and female mouse hearts (n=54).
  • Administered halothane (1.75 mmol/L) and recorded electrocardiograms (ECGs) and optical action potentials (APs).
  • Performed Northern blot analysis for ion channel gene expression.

Main Results:

  • No significant sex differences in standard electrophysiological parameters (RR, PR, QT intervals, APD75, refractory periods, conduction velocity).
  • Halothane induced PVTs with a marked sex difference in total duration (378s in females vs. 27s in males, P<0.05).
  • Female hearts showed a higher incidence of prolonged PVTs compared to male hearts (55% vs. 17%, P<0.05).

Conclusions:

  • This mouse model demonstrates sex differences in response to pharmacological challenges, despite lacking differences in baseline electrophysiological parameters.
  • KCNE1 gene expression differences may underlie the observed sex-specific responses to halothane.