Pendleton BD, Pollay M, Roberts PA, Hisey BN. In vitro evaluation of CSF shunt function by radionuclides.
Childs Nerv Syst 1985;
1:152-7. [PMID:
4042104 DOI:
10.1007/bf00735730]
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Abstract
An in vitro study of clearance of a radiolabeled marker was conducted on nine commonly used shunting devices. Clearance of 0.5 ml of 113mIn-diethylenetriamine-pentaacetic acid (DTPA) injected into the chamber, by water infused through the system at constant rate (0.034-0.46 ml/min), was measured by monitoring activity over the chamber and accumulating counts at 5-s intervals on a multichannel analyzer. Each flow rate was triplicated, and a graph of log value of counts versus time made. A mean t1/2 was computed for each flow rate and a new graph constructed. A best-fit curve constructed for the graph of each shunt system allows determination of flow rate for a known half time of isotope clearance.
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