Abstract
Halothane is an inhalational anesthetic known to change the respiratory pattern. Because of its preferential suppression of intercostal muscle function and relative sparing of diaphragmatic activity [1,2], halothane decreases the rib cage contribution to ventilation (%RC). Inhalational anesthetics also reduce functional residual capacity and decrease the compliance of both the thorax [4] and the lung [5]. For these reasons, an increase in the work of breathing of patients (WOBp) during halothane anesthesia might be expected. To determine the relationship between the respiratory pattern and its mechanics during halothane anesthesia with spontaneous ventilation, we compared measurements obtained using a respiratory inductive plethysmograph and a pulmonary function monitor with an esophageal catheter.
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