AI Article Synopsis
- Sevoflurane induces QT interval prolongation, which was investigated using electrophysiological techniques in guinea-pig ventricular myocytes.
- The study measured various factors, including action potential duration and potassium and calcium currents, under different concentrations of sevoflurane.
- The findings showed that 2% sevoflurane significantly inhibited the delayed rectified potassium current (IKr), while having only a mild effect on the L-type calcium channel current (ICa), suggesting that the imbalance between these currents may contribute to the QT interval prolongation experienced with sevoflurane anesthesia.
Article Abstract
Background: Sevoflurane causes QT interval prolongation clinically, but its precise mechanism has not been clarified. We examined the mechanism of QT interval prolongation induced by sevoflurane by means of electrophysiological technique in guinea-pig ventricular myocyte.
Methods: Electrocardiogram was recorded in guinea-pig and effect of sevoflurane (1, 2, 4%) was examined. Action potential (AP), delayed rectified potassium current (IKr), and L-type calcium channel current (ICa) were monitored as whole-cell current and by voltage clamp techniques in guinea-pig single ventricular myocytes. Sevoflurane was applied by bubbling into the bathing solution.
Results: Sevoflurane (1, 2, 4%) increased QTc value. Sevoflurane prolonged the duration of AP at 2%, but shortened it at 6%. IKr was reduced to 35% of control in the presence of 2% sevoflurane, but a higher concentration (6%) did not show further inhibition. ICa was reduced only to 87% of control in the presence of 2% sevoflurane and the reduction was dose-dependent (4, 6%).
Conclusions: Sevoflurane 2% inhibited IKr, but it showed only slight inhibition on ICa. Because the duration of AP is regulated by ICa (plateau phase) and IKr (repolarization), greater inhibition of IKr than ICa could result in prolongation of AP. It is suggested that this mechanism may play a role in QT interval prolongation under sevoflurane anesthesia.
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