Table 2: Hypoxia, hypercarbia, and high airway pressures in patients of frequent and infrequent double lumen tube users.

Frequent ( 𝑛 = 7 9 0 )Infrequent ( 𝑛 = 9 9 ) 𝑃

Cases with SpO2 < 90%79140.339
Mean duration ± SD (min)7.4 ± 5.67.0 ± 4.30.493
Mean lowest SpO2 ± SD (%)85 ± 482 ± 6<0.005
Cases with EtCO2 > 45 mmHg217340.348
Mean duration ± SD (min)9.3 ± 9.415.1 ± 20.0<0.01
Mean highest EtCO2 ± SD51 ± 554 ± 6<0.02
Cases with PIP > 35 cm H2O552570.308
Mean duration ± SD (min)18.4 ± 18.722.3 ± 22.60.057
Mean highest PIP ± SD43 ± 545 ± 7<0.005

Values for continuous data are reported as mean ± standard deviation and compared by 𝑡 testing. Categorical data were compared by 𝑋 2 analysis.
SD: standard deviation; PIP: peak inspiratory pressure.