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01-05-2020 | Hydrocephalus | Original Article - CSF Circulation

Timing of intraventricular infusion test for diagnosing idiopathic normal pressure hydrocephalus

Authors: Trine Hjorslev Andreasen, Alexander Lilja-Cyron, Anders Vedel Holst, Dorthe Christoffersen, Sara Duus Johnsen, Marianne Juhler

Published in: Acta Neurochirurgica | Issue 5/2020

Abstract

Background

Infusion tests, which measure resistance to outflow (R_out), are used in selecting patients suspected for idiopathic normal pressure hydrocephalus (iNPH) for shunt surgery. Infusion tests can be performed through an external ventricular drain (EVD). A 24-hour time gap from EVD insertion to an infusion test is a routine practice at our department due to concerns that the surgical procedure might influence the test results in the immediate postoperative period. The objective of the study was to investigate if timing of an intraventricular infusion test influences the results of the test in patients suspected for iNPH.

Methods

Ten patients scheduled for an intraventricular infusion test were included. Measurements of baseline intracranial pressure (ICP) and plateau ICP were obtained during constant rate intraventricular infusion test performed at two time points (1 and 24 h after EVD insertion) and R_out was calculated from these measures and compared within patients.

Results

Eight patients completed both infusion tests. In one of the 18 infusion tests performed, it was not possible to define an ICP plateau and this infusion test was excluded, leaving 7 paired infusion tests. Median R_out was 12.9 mmHg/ml/min (range 7.0–22.0) 1 h after EVD insertion and 11.3 mmHg/ml/min (range 7.8–18.1) after 24 h. Overall, there were no statistically significant differences in R_out (P = 0.83), baseline ICP (P = 0.70), or plateau ICP (P = 0.81) between the recordings performed 1 h and 24 h after EVD insertion. For two of the seven patients with paired infusion tests, there was poor agreement between R_out values at 1 and 24 h.

Conclusion

Overall, R_out estimates do not change significantly between 1 and 24 h after EVD insertion. We therefore propose that infusion tests can be performed shortly after surgery to reduce the period of indwelling EVD and duration of hospitalization.

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Title: Timing of intraventricular infusion test for diagnosing idiopathic normal pressure hydrocephalus
Authors: Trine Hjorslev Andreasen
Alexander Lilja-Cyron
Anders Vedel Holst
Dorthe Christoffersen
Sara Duus Johnsen
Marianne Juhler
Publication date: 01-05-2020
Publisher: Springer Vienna
Keywords: Hydrocephalus
Hydrocephalus
Intracranial Hypertension
Hydrocephalus
Intracranial Pressure Monitoring
Published in: Acta Neurochirurgica / Issue 5/2020
Print ISSN: 0001-6268
Electronic ISSN: 0942-0940
DOI: https://doi.org/10.1007/s00701-019-04168-w

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Timing of intraventricular infusion test for diagnosing idiopathic normal pressure hydrocephalus

Abstract

Background

Methods

Results

Conclusion

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Abstract

Background

Methods

Results

Conclusion

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