Journal
AMERICAN JOURNAL OF PHYSIOLOGY-REGULATORY INTEGRATIVE AND COMPARATIVE PHYSIOLOGY
Volume 287, Issue 6, Pages R1450-R1455Publisher
AMER PHYSIOLOGICAL SOC
DOI: 10.1152/ajpregu.00215.2004
Keywords
arachnoid villi; cerebrospinal fluid spinal flow; cerebrospinal fluid production; cerebrospinal fluid pressure; radionuclide imaging
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The present study examines the extent of spinal cerebrospinal fluid (CSF) absorption in healthy individuals in relation to physical activity, CSF production, intracranial pressure (ICP), and spinal CSF movement. Thirty-four healthy individuals aged 21-35 yr were examined by lumbar puncture and radionuclide cisternography with repeated imaging. ICP was registered before and after CSF drainage, and CSF production was calculated. Spinal CSF absorption was calculated as reduction in spinal radionuclide activity. The radionuclide activity in the spinal subarachnoidal space was gradually decreased by 20 +/- 13% (mean +/- SD) during 1 h. The reduction was higher in active than in resting individuals (27 +/- 12% vs. 13 +/- 9%). The mean ICP in 19 of the individuals was 13.6 +/- 3.1 cmH(2)O. B-waves were found in 79% of the individuals, with a mean frequency of 0.6 +/- 0.3 min(-1). The mean CSF production rate was 0.34 +/- 0.13 ml/min. There were no correlations between radionuclide reduction, spinal movement of the radionuclide, and CSF production rate. The spinal radionuclide reduction found in this study indicates a spinal CSF absorption of 0.11-0.23 ml/min, more pronounced in active than in resting individuals.
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