Change of the Peak Inspiratory Airway Pressure and Exhaled Volume during One Lung Ventilation / 대한마취과학회지

ABSTRACT

BACKGROUND: Airway pressure increases during one-lung ventilation compared to two-lung ventilation. We measured the peak inspiratory airway pressure and the actual exhaled volume during one-lung and two-lung ventilation. And then we evaluated the loss of the exhaled volume according to the increase of peak insphatory airway pressure. METHODS: Left-sided double lumen endobronchial tube (male 37 Fr., female 35 Fr.) was inserted in 62 patients and then proper position of double lumen tube was confirmed with the fiberoptic bronchoscopy. After setting the tidal volume (10 ml/kg), respiratory rate 12/min, inspiratory expiratory ratio (1 2) and oxygen 2 1/min, we measured exhaled volume and peak inspiratory airway pressure during two-lung and one-lung ventilation in the supine and lateral decubitus position. RESULTS: The increase of the peak inspiratory airway pressure was ranged from 33.7% to 52.1% and exhaled volume decreased 9.5% to 14.8% in one-lung ventilation compared to two-lung ventilation. CONCLUSIONS: The decrease of actual tidal volume according to the increase of peak inspiratory airway pressure during one-lung ventilation would result in carbon dioxide retention. Therefore we should readjust ventilatory setting during one-lung ventilation.