부산대학교 도서관

The zero deadspace tracheal tube (ZEDS-TT) is a double-lumen endobronchial tube with a truncated bronchial limb. Functionally it is unrelated to the familiar endobronchial tube used in lung isolation surgery. It is placed in the same position as a regular tracheal tube and, by means of special connectors, one limb is used for inspiration and the other for expiration, thereby greatly reducing anatomical and apparatus deadspace. In this study, we have compared respiratory and ventilatory effects of reduction of tidal volume (V_T) via a single-lumen tracheal tube and the ZEDS-TT during controlled ventilation with a Siemens Elema 900C Servo ventilator. Eleven consenting adult patients (ASA I and II) undergoing elective peripheral surgery were studied. Starting at a V_T value of 10 ml kg^-1, data were recorded for each tube type. V _T was reduced by 2.5 ml kg^-1 every 10 min and stabilized data recorded. Minute volume was kept constant by increasing ventilatory frequency at each reduction in V_T. We found that the ZEDS-TT produced a significant reduction in Pa_CO2 and airway pressure for any V_T used, while maintaining oxygenation.
Key words: ventilation, deadspace; ventilation, tidal volume; intubation tracheal; equipment, tubes tracheal; ventilation, mechanical