Key result
Ketamine decreased IK1 (P<0.05) without affecting IK, propofol depressed IK (P<0.001) without affecting IK1, and methohexital had no significant effect on either current in guinea pig myocytes.
Why the study?
Do intravenous anesthetics (ketamine, methohexital, propofol) affect the delayed rectifier (IK) and inward rectifier (IK1) potassium currents in guinea pig ventricular myocytes?
Population
Single dispersed guinea pig ventricular myocytes
Design
Preclinical
Authors
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Animal data on IK/IK1 modulation should not alter anesthetic selection; extends mechanistic insights into potential proarrhythmic effects.
Do intravenous anesthetics (ketamine, methohexital, propofol) affect the delayed rectifier (IK) and inward rectifier (IK1) potassium currents in guinea pig ventricular myocytes?
Intravenous anesthetics exhibit distinct and specific effects on cardiac potassium currents, with ketamine depressing IK1 and propofol depressing IK.
Victor C. Baum (1993) studied this question. Ketamine, methohexital, and propofol was evaluated on Delayed rectifier (IK) and inward rectifier (IK1) currents. Ketamine decreased IK1 (P<0.05) without affecting IK, propofol depressed IK (P<0.001) without affecting IK1, and methohexital had no significant effect on either current in guinea pig myocytes.
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