Long-term reliability of the telemetric Neurovent-P-tel sensor: in vivo case report

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Intracranial pressure (ICP) measurements are imperative for the proper diagnosis and treatment of several neurological disorders. Telemetric sensors have shown their utility for ICP estimation in short-term monitoring in humans. However, their long-term reliability is uncertain. The authors present the case of a 37-year-old woman diagnosed with benign intracranial hypertension and obesity. The patient underwent gastric bypass surgery for ICP control. In order to monitor ICP before and after bariatric surgery, a Neurovent-P-tel sensor was implanted in the left frontal lobe. After gastric bypass, normal ICP values were recorded, and the patient’s visual fields improved. However, the patient experienced incapacitating daily headaches. The authors decided to implant a Codman Microsensor ICP transducer in the right frontal lobe to assess the long-term reliability of the Neurovent-P-tel measurements. A comparison of the recordings at 24 and 48 hours showed good correlation and reliability during long-term monitoring with the Neurovent-P-tel, with minimal zero drift after 11 months of implantation.

ABBREVIATIONS BIH = benign intracranial hypertension; ICP = intracranial pressure.

Article Information

Correspondence Jorge Tirado-Caballero: Virgen del Rocío University Hospital, Sevilla, Spain. jtiradocaballero@gmail.com.

INCLUDE WHEN CITING Published online August 31, 2018; DOI: 10.3171/2018.4.JNS172988.

Disclosures The authors report no conflict of interest concerning the materials or methods used in this study or the findings specified in this paper.

© AANS, except where prohibited by US copyright law.

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Figures

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    Raumedic Neurovent-P-tel measurements. Measurements were performed during weeks 1, 3, and 5 after Neurovent-P-tel implantation. Previous to gastric bypass surgery, ICP in the supine position was very high, i.e., over 15 mm Hg. After gastric bypass surgery, an improvement in ICP was seen with a decrease to within the reference range.

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    Reader TDT1 in the left frontal lobe position reading ICP from the Raumedic Neurovent-P-tel. The Codman Microsensor ICP transducer (CM) is located in the right frontal lobe .

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    Comparison between ICP recordings 24 hours (left) and 48 hours (right) after microsensor implantation. Upper: Codman Microsensor ICP measurements. Lower: Raumedic Neurovent-P-tel ICP measurements. Reliable data were observed. The basal ICP line shows minimal differences of 3–4 mm Hg. Valsalva maneuvers were done, showing the ability of both sensors to adapt at an increase and immediate fall in ICP.

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