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흡입마취제인 Sevoflurane의 QT interval 연장 효과에 대한 전기생리학적인 연구: 쥐 심실근 세포의 K+ 전류에 미치는 영향

Other Titles
 Electrophysiologic Mechanisms of Sevoflurane on Prolongation of the QT Interval: K+ Currents in Rat Ventricular Myocytes 
 채지은  ;  김종훈  ;  민경태  ;  박윤곤 
 KOREAN JOURNAL OF ANESTHESIOLOGY, Vol.50(4) : 454-462, 2006 
Journal Title
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action potential ; inwardly rectifying K+ current ; rat ; sevoflurane ; transient outward K+current ; ventricular myocytes
BACKGROUND: Whereas sevoflurane (SEVO) has been reported to prolong the QT interval, little has been known on the electrophysiologic effects of SEVO which contributes to the prolongation of action potential (AP) duration. METHODS: The ventricular myocytes were obtained from enzymatically treated rat hearts. The standard whole cell voltage-clamp methods were used. The AP was measured using current clamp technique. As a repolarizing K+ current, the transient outward K+ current (Ito), the sustained outward K+ current (Isus), and the inwardly rectifying K+ current (IkI) were measured. The L-type Ca2+ current (ICa, L) was also obtained. After the baseline measurements, the myocytes were exposed to 1.7 and 3.4% SEVO. SEVO concentrations in Tyrode superfusate at room temperature were 0.35 and 0.7 mM for 1.7 and 3.4% SEVO, respectively. Results are mean ± SEM. RESULTS: SEVO prolonged the AP duration, while the amplitude and the resting membrane potential remained unchanged. At membrane potential of +60 mV, peak Ito was significantly reduced by 18 ± 2 and 24 ± 2% by 0.35 and 0.7 mM SEVO, respectively. 0.7 mM SEVO did not shift the steady-state inactivation curve. Isus was unaffected by 0.7 mM SEVO. The IkI at -130 mV was little altered by 0.7 mM SEVO. ICa, L was significantly reduced by 28 ± 3 and 33 ± 1% by 0.35 and 0.7 mM SEVO, respectively. CONCLUSIONS: Prolongation of AP duration by SEVO in rat ventricular myocytes is likely to be caused by a reduction of Ito. Resting membrane potential was unaffected by SEVO, which seems to be related to no alteration of IkI).
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1. College of Medicine (의과대학) > Dept. of Anesthesiology and Pain Medicine (마취통증의학교실) > 1. Journal Papers
Yonsei Authors
Kim, Jong Hoon(김종훈)
Min, Kyeong Tae(민경태) ORCID logo https://orcid.org/0000-0002-3299-4500
Park, Wyun Kon(박윤곤)
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