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Abstract Background and Aim: Today’s, in order to increased an angina pectoris and myocardial infarction, Coronary Artery Bypass Grafting Surgery (CABG ) is considered safe and effective treatment for relieving the symptoms of coronary artery disease. Because of more than 500.000 patients undergo coronary artery bypass graft surgery (CABG) each year in the United States. Supraventricular arrhythmia is the most common complicate of the postoperative course of patients following coronary artery bypass grafting, which of SVT occurs in 40% of elderly patients, and risk of SVT was increased in (45%) patients with a history of atrial arrhythmias. Although it is offer benign and self limited, it can lead to complicated such as stroke. Various etiologies caused to SVT arrhythmia that including: Homodynamic instability and electrolytes imbalance. The purpose of this research was to explore the relationship between fluid and electrolyte variables and the development of Supraventricular Tachycardia (SVT) after CABG in patients at unit ICU heart surgery of Imam Reza Hospital in Mashhad city in 2005. Materials and Methods: This prospective randomized study was carried out in 80 patients undergoing coronary artery bypass grafting. Data collection with demographic variables example: Age, gender, weight, and also previous history of SVT, congestive heart failure, cardiac arrest, previous surgery, diabetic, hypertension, tobacco use, pre and postoperative laboratory values of potassium calcium and magnesium, intravenous intake, hourly urine out put and chest tube drainage. Data analyzed with SPSS soft ware and chi-square test. Results: Results of the presents research showed that, amount of blood drainage in the chest tube and intake and out put of fluids may provide evidence of SVT after CABG in patients. which could lead to better identification and nursing management in ICU (Open heart surgery)for improve homodynamic status , patient recovery and prevention of post operative Supraventricular arrhythmia. Conclusion: According to the results incidence of SVT was 37.5% and ventricular tachycardia was 2.5%.they indicate that there is a significant relationship between the amount of chest tube drainage and urinary out put with SVT after surgery(P<0.05).

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