Browsing by Author "Muñoz Letelier, Hernán Rodrigo"

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    Effect of intravenous fluid therapy on postoperative vomiting in children undergoing tonsillectomy
    (2013) Elgueta Le-Beuffe, María Francisca; Echevarría, Ghislaine C.; De La Fuente, Natalia; Cabrera, F.; Valderrama, A.; Cabezón, R.; Muñoz Letelier, Hernán Rodrigo; Cortínez Fernández, Luis Ignacio
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    Influencia de la obesidad en la farmacocinética de desflurano versus sevoflurano espirado
    (2008) Echevarría, Ghislaine C.; Cortinez, I.; Fuentes Henríquez, Ricardo Sergio; Muñoz Letelier, Hernán Rodrigo
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    Remifentanil requirements during propofol administration to block the somatic response to skin incision in children and adults
    (2007) Muñoz Letelier, Hernán Rodrigo; Cortínez Fernández, Luis Ignacio; Ibacache Figueroa, Mauricio Enrique; Altermatt Couratier, Fernando René
    BACKGROUND: During sevoflurane administration, children require a remifentanil infusion rate twofold higher than adults to block responses to skin incision. Similar data concerning remifentanil requirements are unavailable during total IV anesthesia.", "METHODS: We prospectively determined the infusion rate (IR) of remifentanil necessary to block the somatic response to skin incision in 50% (IR50) of adults (n = 20, aged 20-60 yr) and children (n = 20, aged 3-11 yr) during propofol anesthesia., In each patient undergoing lower abdominal surgery, a remifentanil infusion was initiated, followed by target-controlled infusion of propofol set at a plasma concentration of 6 mu g/mL. After tracheal intubation, propofol was reduced to 3 mu g/mL, until the end of the study. Remifentanil IR was determined according to Dixon's up-and-down method, with the first patient in each group receiving 0.2 mu g (.) kg(-1) (.) min(-1) followed by the consecutive patient receiving 0.02 mu g (.) kg(-1) (.) min(-1) modifications according to the response of the previous patient. The remifentanil IR was kept unchanged for at least 20 min before surgery. At the beginning of surgery, only the skin incision was performed, and the somatic response was observed. If there was any gross movement of extremity the response was considered positive.", "RESULTS: The IR50 (CI95%) was 0.08 (0.06-0.12) mu g (.) kg(-1) (.) min(-1) in adults and 0.15 (0.13-0.17) mu g (.) kg(-1) (.) min(-1) in children (P < 0.001).", "CONCLUSION: These results demonstrate that, similar to sevoflurane anesthesia, during total IV anesthesia with propofol, children require a remifentanil IR almost twofold higher than adults to block the somatic response to skin incision.