Key result
Combined deletion of HCN2 and HCN4 in hypertrophic mice completely disrupted ventricular I(f) and significantly decreased action potential prolongation and QT interval lengthening.
Why the study?
Does the deletion of HCN2 and HCN4 reduce pro-arrhythmogenic parameters in mice with ventricular hypertrophy?
Does the deletion of HCN2 and HCN4 reduce pro-arrhythmogenic parameters in mice with ventricular hypertrophy?
Upregulation of ventricular I(f) via HCN channels in cardiac hypertrophy prolongs repolarization, and deleting HCN2/4 attenuates these pro-arrhythmogenic changes.
No takes yet. Share an insight, caveat, or question.
HCN upregulation may heighten arrhythmia risk in hypertrophy; leaves open whether selective I(f) blockade merits testing.
Hofmann et al. (2012) studied Cardiac hypertrophy. Combined deletion of HCN2 and HCN4 vs. Controls was evaluated on Ventricular I(f) current, action potential prolongation, and QT interval lengthening. Combined deletion of HCN2 and HCN4 in hypertrophic mice completely disrupted ventricular I(f) and significantly decreased action potential prolongation and QT interval lengthening.
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