Comparison of effect of ringer lacatated vs hetastarch solutions on cardiac output during spinal anesthesia

Spinal anesthesia induced hypotension is common and it could be serious and life threatening. Occasionally many types of solutions use for prevention. We compared ringer lacatated (RL) vs Hetastarch (HS) about cardiac output reductions. Methods and materials: This is a randomized clinical trial which has done on 60 lower extremity orthopedic patients who went under surgery whereas spinal anesthesia has done for them. We used from electrovelosimetery for our evaluations. Base line heart rate، systolic and diastolic blood pressure and cardiac output were similar in both groups. whereas they were apparently reduced in ringer lactated group. This study showed effectiveness of hetastarch 6% in preventing of hemodynamic parameters changes in patients undergoing spinal anesthesia in comparison with ringer lactated solutions.