Anestesia para microcirurgia do laringe com laser : avaliação de uma tecnica ventilatoria

AUTOR(ES)
DATA DE PUBLICAÇÃO

1996

RESUMO

The CO2 laser used in larynx microsurgery can determine ignition on the airway caused by high temperatures researched by tissue interactions or by reflective beam from surgical or anesthetic instruments. Ventilatory thecniques, intending to reduce the ignition risks by using endotracheal tubes protected with mettalic tapes or, even, by mettalics tubes, were tested. This study tried to evaluate a ventilatory technique variant that uses manual jet controlled ventilation with oxygen in 100% inspired fraction within a metal tube. Its internal and external diameters were 2,5 and 3,0 mm, respectively, being located in inflaglottic position. Intencionaly, the ventilation was interrupted for 90 seconds at each moment that laser was being operated. Fourteen children, with larynx papillomatosis, were undergone endovenous anesthesia with propofol (2,5 mg.kg-1), alfentanil (30?g.kg-l) and atracuriurn (0,5 mg.kg-1). Gasornetric parameters, blood pressures and heart beat alterations and complications occurrence were studied. Statistically significant variations were considered from the first surgical proeedures of each child. The children were separeted in two groups according to the use of premedication (GI - midazolam 0,5 mg. kg-1, VO; G 11 - no premedication). The groups were similar in their profile. The patients in Group I showed decrease in heart beat after the first period of apnea (T2), although not being statistically different from Group I. Group 11 showed reduction in both sistolic and diastolic blood pressures after laryngoscopy (T I), rnaking significant difference between groups. Pa02 and Sata02 values didn t differ between groups. In both groups, PaC02 were high in T2. Significant difference were seen in Group I between TI and T2 and, in Group 11, between TO (control) and TI, TI and T2, T2 and T3. The groups were statistically differents in TO. Bradyeardia was present in 28,57% and the groups were considered statistically differents in frequency of complications observed. The ventilatory technique showed to be safe in infant patients undergone larynx microsurgery putting the fire risk away; increased the surgical field view to surgeons and garantted adequate ventilation

ASSUNTO(S)

laringe - cirurgia a laser respiração artificial

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