the Diameter of Double-lumen Tube Measured by Different Methods

The Accuracy of the Diameter of Double-lumen Tube Measured by Different Methods as a Guide to the Size Selection of Double-lumen Tube

The comparison of the diameter of double-lumen tube at the cuff of endotracheal and endobronchial during the cuff was collapse or inflated as a guide for the selection of the size of double-lumen tube.

The comparison of the diameter of double-lumen tube at the cuff of endotracheal and endobronchial during the cuff was collapse or inflated as a guide for the selection of the size of double-lumen tube.

Inclusion Criteria:

BMI less than 35 kg/m2 ASA classifications of I-III, Modified Mallampati classification 1 or 2 Under general anesthesia

Exclusion Criteria:

Age younger than 18 yr or older than 70 yr

• ASA class IV or V
• Abnormalities of the heart, brain, liver, lung, kidney and coagulation function