Journal of cardiac surgery
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Comparative Study
Myocardial infarction in coronary bypass surgery using on-pump, beating heart technique with pressure- and volume-controlled coronary perfusion.
Even with the current aerobic techniques in myocardial protection, perioperative myocardial infarction can still occur. In this study, we sought to find out whether there is a method-specific mechanism of ischemic injury in coronary bypass surgery using an on-pump beating heart technique. For this reason, we investigated localization and the extent of myocardial infarction in correlation to the severity of coronary artery stenosis. We discuss strategies for reduction of infarction incidence. ⋯ Using an on-pump beating heart technique, higher coronary perfusion pressures, avoidance of extreme upward retraction of the heart during revascularization of the CX-branch, as well as choosing the revascularization of the LAD as the first vessel, could possibly contribute to better myocardial protection. In hearts arrested with cardioplegic solution, the right ventricle is probably more susceptible to ischemic injury, especially when RCA is poorly collateralized. For adequate protection, choosing the revascularization of the RCA as the first vessel with immediate repeated cardioplegia via a RCA graft, higher perfusion pressures and antegrade with retrograde cardioplegia delivery, may be advantageous.
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Comparative Study
S100B blood levels correlate with rewarming time and cerebral Doppler in pediatric open heart surgery.
Brain hyperthermia, accompanying the rewarming phase of cardiopulmonary bypass (CPB), has been involved in the genesis of postoperative brain damage. Blood S100B levels are emerging as a marker of brain distress, and could offer a reliable monitoring tool at different times during and after open heart surgery. ⋯ The present results show a significant correlation between a biochemical marker of brain damage and an index of increased cerebrovascular resistance, with higher levels during the rewarming CPB phase in pediatric open heart surgery.
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Comparative Study
Adrenomedullin: a cardiac depressant factor in septic shock.
Despite intensive research, septic shock is still the most common cause of death in surgical intensive care, and its incidence keeps increasing. No curative treatment is yet available. The critical aspect of septic shock is the refractory hypotension that develops during its late phase which leads to a progressive deterioration of cell and organ functions, and in most instances, death. ⋯ Here we show that adrenomedullin (22-52), an adrenomedullin receptor antagonist, improves the contractility of myocytes isolated from lipopolysaccharide (LPS)-treated rats, whereas in normal myocytes, adrenomedullin, acting through an adrenomedullin (22-52) sensitive receptor, decreases their contractility. In addition, adrenomedullin antiserum and inducible nitric oxide (NO) synthase inhibitor improve the survival of LPS-treated rats. The data indicate that adrenomedullin is a cardiac depressant factor, which along with NO precipitates ventricular failure during septic shock.