Table 1.
Demographics and clinical characteristics.
Table 2.
1st and 2nd apnea test results.
Fig 1.
Increase in the partial pressure of carbon dioxide (PaCO2) in the apnea test.
(A) At 3 min in the 1st apnea test, the PaCO2 level was above 60 mmHg. (B) At 4 min in the 2nd apnea test, the PaCO2 level was above 60 mmHg. The apnea test positive criterion is PaCO2 > 50 mmHg in South Korea, and PaCO2 > 60 mmHg according to the American Academy of Neurology (AAN) guidelines. The dotted line denotes the apnea test positive criterion according to the AAN guidelines.
Fig 2.
Serial change in partial pressure of oxygen (PaO2).
(A) Serial changes in PaO2 were significant in the 1st apnea test (P < 0.05). (B) Serial changes in PaO2 were not significant in the 2nd apnea test (P = 0.095).
Table 3.
Plateau pressure and norepinephrine infusion rate of pre- and post-apnea test.
Fig 3.
Difference in mean arterial blood pressure fluctuation during the apnea test according to chest radiography findings.
The difference in mean arterial blood pressure fluctuations between the two groups was not significant (P = 0.888).