CSF shunt physics: factors influencing inshunt CSF flow

Cerebrospinal fluid (CSF) in a shunt does not have a constant flow rate. The flow fluctuates from 0.01 ml/min to 1.93 ml/min according to each patient's own daily supine rhythmic pattern. We determined and evaluated the factors influencing CSF flow in a shunt in 19 cases of hydrocephalus. Postu...

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Bibliographic Details
Published in:Child's nervous system 1995-04, Vol.11 (4), p.203-206
Main Authors: KADOWAKI, C, HARA, M, NUMOTO, M, TAKEUCHI, K, SAITO, I
Format: Article
Language:English
Subjects:
Adolescent
Adult
Aged
Biological and medical sciences
Cerebrospinal Fluid Pressure - physiology
Cerebrospinal Fluid Shunts - instrumentation
Cerebrospinal fluid. Meninges. Spinal cord
Female
Humans
Hydrocephalus - cerebrospinal fluid
Hydrocephalus - surgery
Intracranial Pressure - physiology
Male
Medical sciences
Middle Aged
Nervous system (semeiology, syndromes)
Neurology
Physical Phenomena
Physics
Posture - physiology
Pulmonary Ventilation - physiology
Reference Values
Rheology - instrumentation
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Summary:Cerebrospinal fluid (CSF) in a shunt does not have a constant flow rate. The flow fluctuates from 0.01 ml/min to 1.93 ml/min according to each patient's own daily supine rhythmic pattern. We determined and evaluated the factors influencing CSF flow in a shunt in 19 cases of hydrocephalus. Postural changes, such as head elevation, led to increases by over 0.04 ml/min in inshunt CSF flow, while inshunt CSF flow in the supine position was less than 0.04 ml/min. Respiratory changes, such as coughing and apnea-hyperventilation, also influenced inshunt CSF flow. Changes in intracranial pressure (ICP) corresponded to changes in inshunt CSF flow. Inshunt CSF flows were higher than average during the night, the flows being stimulated by increases in ICP especially during REM sleep.
ISSN:0256-7040
1433-0350
DOI:10.1007/bf00277654