Table 1.

Demographic Data and Variables at Each ONSD Measurement

Data are expressed as mean ± SD. MAP: mean arterial pressure, HR: heart rate, PaCO₂: arterial partial pressure of carbon dioxide, ETCO₂: end-tidal carbon dioxide concentration, PaCO₂-ETCO₂: the difference between PaCO₂ and ETCO₂. ^*P< 0.001.