Pediatric Neurosurgery
Dynamic Changes of Cerebrospinal Fluid in Upright and Recumbent Shunted Experimental AnimalsYamada S. · Ducker T.B. · Perot P.L.Loma Linda University Medical Center, Loma Linda, Calif.
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Article / Publication Details
Published online: February 27, 2008
Issue release date: 1975
Number of Print Pages: 6
Number of Figures: 0
Number of Tables: 0
ISSN: 1016-2291 (Print)
eISSN: 1423-0305 (Online)
For additional information: https://www.karger.com/PNE
Abstract
The effect of positional change on intracranial CSF pressure, valve flow rates and atrial pressures were studied in 40 experimental dogs. The flow rate with a 30 to 60 mm H2O Holter valve changed from the recumbent to the head-up position: during the first minute it increased 2½ times and then progressively decreased to become stabilized 20–30 min later at a value slightly lower than the head-up value. At the same time pressure dropped rapidly to –23 mm H2O and then slowly, during 30 min to –120 mm H2O. In dogs without a shunt the pressure drop was initially similar to that of shunted dogs but recovered to almost the initial positive pressure in 30 min. The flow rate from a reservoir to the atrium through a shunt system when changing to the head-up position showed a siphon effect. Atrial pressure does not change with positioning. The findings were similar with cisternal-peritoneal shunts. Flow rate, therefore, increase in the head-up position. Negative intracranial CSF pressure was due to a siphon effect through the shunt system.
© 1975 S. Karger AG, Basel
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Article / Publication Details
Published online: February 27, 2008
Issue release date: 1975
Number of Print Pages: 6
Number of Figures: 0
Number of Tables: 0
ISSN: 1016-2291 (Print)
eISSN: 1423-0305 (Online)
For additional information: https://www.karger.com/PNE
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