Renalase, Catecholamine and Nitric Oxide Changes Before and After Sodium Nitroprusside Administration to Patients who Develop Post-Coronary Artery By-Pass (CABG) Hypertension
Background: Hypertension develops at a rate of 33 to 70% after Coronary artery bypass grafting (CABG) operations. One of the most commonly used drugs to control hypertension is sodium nitroprusside (SNP). Additionally, renalase enzyme destroys catecholamines and mediates the regulation (reduction) of blood pressure. Thus, this clinical study aims to reveal how renalase, catecholamines and nitric oxide (NO) change and how certain hemodynamic parameters are affected in randomly and prospectively selected cases who are administered SNP for the treatment of blood pressure elevation within 6 to 8 hours after CABG surgery.
Methods: The study included 26 patients who developed hypertension after CABG, 12 patients who had normal blood pressure after CABG, and 22 healthy individuals. Renalase and catecholamine levels of the patients were measured using ELISA method and NO levels were determined by spectrophotometry.
Results: Renalase and NO levels of the patients who developed hypertension after CABG were found statistically significantly lower than those of healthy controls and patients who did not develop hypertension after CABG, while catecholamine levels were significantly higher in the former. After SNP was started, renalase and NO levels increased, and a significant decrease was observed in the catecholamine levels. Additionally, administration of SNP produced a slight increase in the heart rate and a decrease in systolic arterial pressure (SAP), diastolic arterial pressure (DAP) and means arterial pressure (MAP).
Conclusion: SNP elevates NO and renalase levels; thus, administration of renalase preparations, which act in the destruction of catecholamines to contain persistent hypertension that develops in association with catecholamine elevation after CABG surgery, along with SNP and other medications used to lower blood pressure can be an effective therapeutic method to control hypertension.
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