Abstract
Hypothermia is a life-threatening event during the perioperative period. No consensus has been reached about the best active warming approach for such cases. Furthermore there is no consensus on the most appropriate time to warm a hypothermic patient. This study aimed to assess the efficacy of a forced-air blanket to warm patients at 38 degrees C before and during surgery. Following utilization of the forced-air blanket, adverse effects were evaluated. Patients submitted to orthopedic surgeries were divided into four groups of 15 patients. In the control group (Gcont), patients were not warmed with a forced-air blanket. In the preoperative group (Gpre), intraoperative group (Gintra), and total group (Gtotal), patients were warmed at 38 degrees C, during 30 minutes before anesthetic induction, after anesthetic induction up to 120 minutes and before and after the induction, respectively. Parameters evaluated were central (tympanic) temperature, peripheral (skin) temperature, operating room temperature, variations in the hemodynamic conditions and warming-induced adverse effects. Only Gtotal did not show significant variation in central temperature. Central temperatures of Gtotal patients were significantly higher (p <0.05) than those of other groups at 60 and 120 min after induction. In Gcont, Gpre and Gintra, patients were hypothermic at 60 min. The forced-air blanket is effective to prevent intraoperative hypothermia when applied for a period ranging from 30 min before anesthetic induction to 120 min after anesthetic induction. In the conditions of this study, adverse effects were not observed.
Highlights
This study aimed to assess the efficacy of a forced-air blanket to warm patients at 38oC before and during surgery
Patients submitted to orthopedic surgeries were divided into four groups of 15 patients
In the control group (Gcont), patients were not warmed with a forced-air blanket
Summary
Ricardo Caio Gracco De Bernardis1*, Mauro Prado da Silva[2], Judymara Lauzi Gozzani[3], Marcelo Lacava Pagnocca[4], Lígia Andrade da Silva Telles Mathias[5] Trabalho realizado na Irmandade da Santa Casa de Misericórdia de São Paulo, S. Este estudo teve como objetivo primário verificar a eficácia de diferentes períodos de utilização da manta térmica à temperatura de 38°C, como método de prevenção da hipotermia intraoperatória. O método mais efetivo de manutenção da normotermia intraoperatória é a prevenção por meio de aquecimento prévio, com o objetivo de aquecer a temperatura periférica em maior escala que a temperatura central e promover, após a indução anestésica, menor gradiente entre a temperatura central e periférica, menor redistribuição de calor, resultando em menor hipotermia[13,14,15,16,17,18]. O objetivo primário deste estudo foi verificar a eficácia de diferentes períodos de utilização da manta térmica à temperatura de 38oC, como método de prevenção da hipotermia intraoperatória.
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