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Radionuclide shunt patency study for suspected ventriculoatrial shunt malfunction
Beril Gok1, Sachin Batra, Hedieh Eslamy
1Department of Radiology, Mercy Catholic Medical Center, Drexel University, Philadelphia, PA, USA. berylgok@gmail.com
Clinical Nuclear Medicine
|May 4, 2013
Summary
Radionuclide ventriculoatrial shunt studies effectively diagnose shunt malfunction. A half-time (T½) value between 3.9-8 minutes indicates a patent shunt, while shorter times suggest overdrainage, aiding clinical decisions.
Area of Science:
- Neurosurgery
- Nuclear Medicine
- Radiology
Background:
- Radionuclide shunt studies are used to evaluate intracranial shunt patency.
- Current methodology lacks standardization and validation.
- Suspected shunt malfunction requires accurate diagnostic tools.
Purpose of the Study:
- To determine the clinical utility of radionuclide ventriculoatrial (VA) shunt patency (SP) studies.
- To diagnose suspected shunt malfunction using radionuclide SP studies.
Main Methods:
- Retrospective review of VA radionuclide SP studies (2001-2009).
- 20-minute gamma camera acquisition after 99mTc DTPA injection into the shunt reservoir.
- Quantification of shunt emptying half-time (T½) and correlation with clinical diagnoses.
Main Results:
- Analysis of 49 studies in 40 adult patients with >6 months follow-up.
- T½ of 3.9-8.0 minutes correlated with normal functioning shunts (13 studies).
- T½ < 3.9 minutes indicated overdrainage (14 studies, 1 revision).
- T½ > 8 minutes required further evaluation for obstruction or abnormal drainage (22 studies).
Conclusions:
- Radionuclide SP studies are valuable for VA shunt evaluation.
- Shunt patency can be interpreted using T½.
- Specific T½ ranges correlate with patent shunts, overdrainage, and potential obstruction, guiding further management.
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