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Effect of halothane on sarcolemmal calcium channels during myocardial ischemia and reperfusion
B Drenger1, Y Ginosar, Y Gozal
1Department of Anesthesiology and Critical Care Medicine, Hadassah University Hospital, Jerusalem, Israel.
Insights
Halothane may protect the heart during surgery by inhibiting calcium buildup during ischemia and preventing arrhythmias. This volatile anesthetic shows promise for open heart surgery patients experiencing myocardial ischemia and reperfusion.
Area of Science:
- Cardiology
- Anesthesiology
- Cardiovascular Surgery
Background:
- Myocardial ischemia during surgery can lead to calcium accumulation and arrhythmias.
- Halothane has previously shown inhibitory effects on calcium accumulation in isolated heart models.
Purpose of the Study:
- To investigate the potential cardioprotective effects of halothane during myocardial ischemia and reperfusion.
- To explore the use of halothane in open heart surgery to mitigate ischemic damage.
Main Methods:
- Utilized continuous perfusion of oxygenated blood cardioplegia retrogradely through the coronary sinus.
- Administered volatile anesthetic (VA) before and during the ischemic period of cardiopulmonary bypass.
Main Results:
- Provided indirect support for halothane inhibiting ischemia-associated Ca2+ accumulation in guinea pig hearts.
- Indicated halothane's role in preventing ischemia-induced dysrhythmias.
- Suggested halothane attenuates free radical generation during reperfusion.
Conclusions:
- Halothane demonstrates a potentially beneficial effect on the ischemic heart.
- Halothane's properties suggest a new potential use in open heart surgery.
- Further research may support the use of volatile anesthetics during myocardial ischemia and reperfusion in cardiac surgery.
Abstract:
The present results provide indirect support for other studies which showed that halothane inhibited the Ca2+ accumulation associated with myocardial ischemia in isolated guinea pig hearts (6), demonstrating a potentially beneficial effect of the anesthetic on the ischemic heart. The role of halothane in preventing ischemia-induced dysrhythmias and attenuation of free radical generation on reperfusion offers a new potential use during open heart surgery. The method of continuous perfusion of oxygenated blood cardioplegia, retrogradely, through the coronary sinus, enables a concomitant administration of the VA before and during the ischemic period of the cardiopulmonary bypass. Further studies may promote the use of the volatile anesthetic when myocardial ischemia and reperfusion are present during open heart surgery.