[Estimation of the position of right-sided double-lumen endobronchial tubes with spirometry in elderly patients].

Objective: To study the accuracy of position estimation of right-sided double-lumen endobronchial tubes (DLTs) without carinal hook in elderly patients according to the changes of inspiratory peak airway pressure (Ppeak), lung compliance (Cdyn), pressure-volume loop (P-V loop), and flow-volume loop (F-V loop).

Methods: Ninety-six elderly patients undergoing thoracic surgery were intubated with right-sided Mallinckrodt DLTs, the depth of which was determined based on the regressive equation. After 15 min of two lung ventilation (TLV), the Ppeak showed a more than 50% increase from the baseline in 22 patients when switching to one lung ventilation (OLV) with Cdyn less than 50% of the baseline and Ppeak in excess of 22 cmH(2)O.

[Influence of the position of double-lumen endobronchial tube on the efficacy of lung separation and ventilation].

Objective: To observe the incidence of double-lumen endobronchial tubes (DLT) malposition caused by body position change or surgical manipulation and its impact on the efficacy of lung separation and ventilation.

Methods: Totally 688 patients undergoing thoracic surgery were enrolled in this study. The patients were intubated with Mallinckrodt DLT following intravenous anesthesia induction.