[Effect of sevoflurane on contraction and membrane potentials in canine right ventricular myocytes].
The effects of sevoflurane on contraction and membrane potentials were studied in isolated canine ventricular muscle strips. Sevoflurane depressed electrically-induced contraction in a dose-dependent manner. The inhibitory effect was more pronounced in high-K+ Tyrode solution than in normal Tyrode solution suggesting that sevoflurane inhibits transmembrane Ca2+ influx. In electrophysiological studies, sevoflurane depressed both overshoot and the plateau phase of action potentials. Resting membrane potential was not affected by sevoflurane. We conclude that the depression of myocardial contractility by sevoflurane may be due to block of transmembrane calcium influx.
Hatakeyama
N
N
Department of Anesthesiology University, School of Medicine, Toyama.
Kubo
H
H
Shibuya
N
N
Yamazaki
M
M
Ito
Y
Y
Momose
Y
Y
D000200:Action Potentials / Q000187:drug effects; D000818:Animals; D003864:Depression, Chemical; D004285:Dogs; D004558:Electric Stimulation; D004594:Electrophysiology; D004987:Ethers / Q000494:pharmacology*; D006352:Heart Ventricles; D066298:In Vitro Techniques; D008564:Membrane Potentials / Q000187:drug effects; D008738:Methyl Ethers; D009200:Myocardial Contraction / Q000187:drug effects*; D009206:Myocardium / Q000166:cytology*; D000077149:Sevoflurane
D004987:Ethers; D008738:Methyl Ethers; D000077149:Sevoflurane