Comparison between two techniques of volemic expansion during surgery to total hip arthroplasty: hydroxyethyl starch (130/0,4) and lactateds Ringer solutions. Study prospective, randomized / Estudo prospectivo randomizado comparando duas técnicas de expansão volêmica em cirurgia de artroplastia total de quadril: hidroxietilamido (130/0,4) e Ringer lactato




Introduction: Hydroxyethyl starches (HES) are considered effective plasma expanders in patients undergoing major surgeries. However, the clinical use of HES is limited mainly by their affection of hemostasis, detectable by impaired platelet function and altered coagulation. The extent of such alteration has classically been related to the molecular weight or molar substitution of the used HES solution. This prospective, randomized study was performed during hip arthroplasty in adult patients under spinal anesthesia to compare the effects of HES 130/0.4 with lactateds Ringer solution regarding intraoperative bleeding, hemodynamic parameters, coagulation profile, transfusion requirements and clinical outcomes. Methods: Forty eight patients scheduled to hip arthroplasty after spinal anesthesia were randomized in two groups 24 patients were allocated to receive HES 130/0.4 (30 ml/Kg just after anesthesia) and 24 patients were signaled to receive lactateds Ringer solution (30 ml/Kg). The observational period started after the induction of anesthesia and finished 5 hours after the end of the surgery. During this period, the triggers for infusion of additional boluses of fluids (10 ml/Kg of lactateds Ringer for both groups) were a systolic blood pressure lower than 90 mmHg and/or a decrease of 20% from baseline, a heart rate higher than 100 bpm, and/or a urine output lower than 0.4 ml.Kg-1.h-1. Vasopressors were used if there was persistent hypotension despite of fluid reposition. Red blood cell transfusion was administered if patient remained unstable despite of additional boluses of Ringer or vasopressors, according to the preestablished triggers. Hemodynamic measurements were done in three periods of the surgery, biochemical parameters were analyzed and coagulation tests were performed and compared between groups. After surgery, patients were followed during the hospital stay. Results: The groups were well matched regarding demographic data, type of surgery, and duration of surgery, as well as preexisting diseases. No significant differences in hemodynamic or body temperature were seen during the study. Coagulation variables, platelet function, gases analysis and biochemical parameters were not different between groups. Blood losses were significantly higher in HES 130/0.4 group comparing to Ringers group (1296 x 890 ml, p= 0.046). Despite of that, HES group required less units of blood in the observational period comparing to Ringer group (17% versus 46%, p=0.029). HES group presented lower infection rate compared to Ringer group (0 versus 4 cases, p=0.03). Conclusions: During hip arthroplasty, hemodilution with hydroxyethyl starch 130/0.4 resulted in higher rates of bleeding. However, patients treated with hydroxyethyl starch required less transfusion and presented lower rate of infection.


arthroplasty replacement hip anesthesia spinal hidratação artroplastia de quadril fluid therapy hetamido hemodilution hemodiluição transfusão de eritrócitos erythrocyte transfusion raquianestesia hetastarch

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