Table 1.

CSF volume (ml) during forced breathing: aqueduct and upper thoracic spinal canal

SubjectScanAqueductTh2Th5
InspirationExpirationNet volumeInspirationExpirationNet volumeInspirationExpirationNet volume
#111.32.03.316.5−1.415.120.5−9.910.6
21.81.53.316.80.116.916.1−6.010.1
#210.20.30.50.70.41.10.2−1.4−1.2
20.40.61.00.31.21.5−0.4−0.3−0.7
#310.50.40.91.10.92.00.4−0.8−0.4
20.70.31.01.80.62.41.9−0.71.2
#410.20.10.31.8−0.61.22.4−3.5−1.1
20.20.10.32.0−0.31.71.4−2.7−1.3
#511.31.02.3−1.4−1.0−2.4−0.4−0.2−0.6
21.11.22.3−3.1−3.4−6.5−0.50.1−0.4
#610.40.20.62.7−0.42.32.6−1.31.3
20.30.20.51.40.11.52.9−1.21.7
#710.40.30.70.21.31.50.00.00.0
20.70.41.10.5−0.20.30.3−1.8−1.5
#810.10.00.11.00.31.30.1−1.5−1.4
20.20.00.20.71.42.11.6−0.80.8
#911.0−0.40.65.7−1.34.42.0−0.61.4
21.9−0.21.75.7−1.14.61.7−0.31.4
#1010.40.10.54.70.55.21.9−1.40.5
20.40.10.52.8−1.21.6Not performed
#1110.50.10.63.61.04.61.5−2.0−0.5
20.40.10.53.20.63.82.3−3.5−1.2
#1210.4−0.20.21.6−1.20.40.00.00.0
20.5−0.30.21.8−1.10.71.1−1.6−0.5
Mean ± SDa0.6 ± 0.50.3 ± 0.61.0 ± 0.93.0 ± 4.6−0.2 ± 1.12.8 ± 4.72.6 ± 5.1−1.8 ± 2.31.0 ± 3.2
  • aAveraged across subjects.