Skip to main content

Table 2 Absolute volumes under normocapnia and hypercapnia

From: Arterial CO2 pressure changes during hypercapnia are associated with changes in brain parenchymal volume

 Volumes at NC (mL)Volumes at HC (mL)ΔVolume (mL)p value
Intracranial volume1508 (1493, 1587)1507 (1495, 1581)-3.0 (-1.5, -6.5)0.271
BPV1234 (1162, 1305)1243 (1167, 1311)6.0 (4.5, 8.5)0.016
Grey matter707 (653, 745)714 (654, 740)2.0 (-0.5, 5.0)0.498
White matter528 (524, 548)535 (527, 554)4.0 (2.5, 7.0)0.022
Total CSF295 (279, 318)285 (267, 312)-10.0 (-13.5, -6.5)0.034
Ventricular CSF17.6 (15.1, 22.3)17.3 (14.8, 22.0)-0.4 (-0.3, -0.5)0.016
  1. Volumes are given as median and interquartile range (in parentheses). Values are rounded to the nearest integer. Volume changes are calculated from unrounded data
  2. NC Normocapnia, HC Hypercapnia, BPV Brain parenchymal volume, CSF Cerebrospinal fluid