Potential Difference Records from Human Cerebrospinal Fluid
The electrical potential difference (PD) between ventricular cerebrospinal fluid (CSF) and blood was recorded simultaneously with intraventricular pressure in children with shunted hydrocephalus. The mean basal value was +4.1 mV. The ECG and small amplitude PD changes which matched the respiratory trace were seen in all patients. More prolonged wave-like PD changes, lasting about ten minutes, preceded A, or plateau, wave changes on the pressure trace, and were followed by a small positive change which lasted throughout the plateau wave. Similar briefer PD waves preceded individual B waves in the pressure trace. During episodes of recurrent B wave activity the overall PD showed more prolonged wave-like changes lasting up to an hour. In one patient a negative PD change was also associated with an episode of increased pulse pressure without an overall rise in pressure. The PD changes suggest that A and B pressure waves in the ventricular CSF are triggered by active secretion.
KeywordsElectrical potential difference Intraventricular pressure Plateau wave B waves
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- Armstrong WM (1987) Cellular mechanisms of ion transport in the small intestine. Chap 45 In: Johnson LR (ed). Physiology of the gastrointestinal tract Raven, New York, pp 1251–1265Google Scholar
- Bockris JOM, Reddy AKN (1970) Modern electrochemistry: an introduction to an interdisciplinary area MacDonald, LondonGoogle Scholar
- Carr HF (1975) Physiology of the choroid plexus. In: Netsky MG, Shuanshoti S (eds) The choroid plexus in health and disease. John Wright Bristol, pp 175–195Google Scholar
- Read NW (1980) Kinetic study of small intestinal transport in man determined by measurements of transmucosal potential difference. MD thesis, University of CambridgeGoogle Scholar
- Rosner MJ, Becker DP (1984) Origin and evolution of plateau waves. Experimental observations and a theoretical model. J Neurosurg 60: 312–324Google Scholar