ABSTRACT
Hemodynamic stability in patients after coronary artery bypass graft surgery [CABG] with the cardiopulmonary bypass pump [CPB], especially during transfer to ICU ward and the early hours of ICU admission is very important. Adequate fluid therapy and intravascular volume maintenance as a matter of principle is essential using various intravenous fluids, but there is always the question of what is the ideal intravenous fluid?. The aim of this study is to compare the effects of gelatin, hydroxyethyl starch [HES 6%, Voluven], and Ringer's solution to maintain hemodynamic status after cardiopulmonary bypass in patients undergoing coronary artery bypass surgery. In this randomized double blind clinical trial, 92 patients who were candidates for onpump CABG were studied. After discontinuation of CPB, all patients were transferred to the ICU and were put randomly into three groups. The first group received Ringer's solution, the second group gelatin 4%, and the third group HES 6% [Voluven]. Hemodynamic parameters like heart rate, mean arterial pressure, systolic blood pressure, diastolic blood pressure, central venous pressure, cardiac output and the presence of arrhythmias were documented. The volume that was needed for maintaining normal blood pressure and central venous pressure [CVP] in the range of 10 to 14 mmHg was less in the HES group than the other groups, but was similar in the gelatin 4% and Ringer's groups in the first 24-hours after surgery. Urinary output in the first four hours and 24 hours after surgery were significantly higher in the HES group than the other two groups, and mean creatinine levels were significantly lower in the HES group. HES 6% has better volume-expanding effects than gelatin 4% and Ringer's solution and its short-term effects on renal function are also better