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Journal of Clinical Monitoring and Computing

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19-03-2023 | Intracranial Hypertension | Case Report

Noninvasive neuromonitoring with rheoencephalography: a case report

Authors: Louis A. Cannizzaro, Ifeanyi Iwuchukwu, Victoria Rahaman, Mohammad Hirzallah, Michael Bodo

Published in: Journal of Clinical Monitoring and Computing | Issue 5/2023

Abstract

Cerebral blood flow (CBF) autoregulation (AR) can be monitored using invasive modalities, such as intracranial pressure (ICP) and arterial blood pressure (ABP) to calculate the CBF AR index (PRx). Monitoring PRx can reduce the extent of secondary brain damage in patients. Rheoencephalography (REG) is an FDA-approved non-invasive method to measure CBF. REGx, a CBF AR index, is calculated from REG and arm bioimpedance pulse waves. Our goal was to test REG for neuromonitoring. 28 measurement sessions were performed on 13 neurocritical care patients. REG/arm bioimpedance waveforms were recorded on a laptop using a bioimpedance amplifier and custom-built software. The same program was used for offline data processing. Case #1: The patient’s mean REGx increased from − 0.08 on the first day to 0.44 on the second day, indicating worsening intracranial compliance (ICC) (P < 0.0001, CI 0.46–0.58). Glasgow Coma Scale (GCS) was 5 on both days. Case #2: REGx decreased from 0.32 on the first recording to 0.07 on the last (P = 0.0003, CI − 0.38 to − 0.12). GCS was 7 and 14, respectively. Case #3: Within a 36-minute recording, REGx decreased from 0.56 to − 0.37 (P < 0.0001, 95%, CI − 1.10 to − 0.76). Central venous pressure changed from 14 to 9 mmHg. REG pulse wave morphology changed from poor ICC to good ICC morphology. Bioimpedance recording made it possible to quantify the active/passive status of CBF AR, indicate the worsening of ICC, and present it in real time. REGx can be a suitable, non-invasive alternative to PRx for use in head-injured patients.

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Title: Noninvasive neuromonitoring with rheoencephalography: a case report
Authors: Louis A. Cannizzaro
Ifeanyi Iwuchukwu
Victoria Rahaman
Mohammad Hirzallah
Michael Bodo
Publication date: 19-03-2023
Publisher: Springer Netherlands
Keywords: Intracranial Hypertension
Neuromonitoring
Published in: Journal of Clinical Monitoring and Computing / Issue 5/2023
Print ISSN: 1387-1307
Electronic ISSN: 1573-2614
DOI: https://doi.org/10.1007/s10877-023-00985-8

At a glance: The STEP trials

Springer Medicine

Noninvasive neuromonitoring with rheoencephalography: a case report

Abstract

At a glance: The STEP trials

Springer Medicine

Abstract

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