Abstract
A simple method is described of examining patency of ventriculoatrial shunting systems. A thermosensor with a built-in thermistor for measuring temperature changes, was devised. This instrument can easily be taped behind the ear of a hydrocéphalie child distal to the Holter valve. An ice cube, applied 1 cm. proximal to the valve produces cooling of the CSF in the drain. If no obstruction is present, the thermosensitive device records a temperature change in the catheter. Animal experiments demonstrated that reliable results can be obtained. As the procedure is harmless it can be performed repeatedly during regular control of draining systems.
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