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4.10 - Neuromonitoring and Cerebral Protection

from Section 4 - Therapeutic Interventions and Organ Support

Published online by Cambridge University Press:  27 July 2023

Ned Gilbert-Kawai
Affiliation:
The Royal Liverpool Hospital
Debashish Dutta
Affiliation:
Princess Alexandra Hospital NHS Trust, Harlow
Carl Waldmann
Affiliation:
Royal Berkshire Hospital, Reading
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Summary

Key Learning Points

  1. 1. The physiological changes governing the Monro–Kellie doctrine become quickly exhausted when the intracranial volume reaches a critical value, thus expediting intracranial hypertension.

  2. 2. The main factors influencing the balance between cerebral oxygen delivery and consumption are cerebral blood flow (CBF), arterial oxygen saturation (SaO2), haemoglobin concentration and cerebral metabolic rate of oxygen (CMRO2).

  3. 3. In the critical care unit, the most common advanced neuromonitoring technique involves measurement of intracranial pressure (ICP) and estimation of cerebral perfusion pressure (CPP). However, brain tissue oxygen tension (PtiO2), jugular venous oxygen saturation (SjvO2), cerebral microdialysis, transcranial Doppler ultrasound and continuous electroencephalography are also helpful to detect early complications.

  4. 4. Jugular venous oxygen saturation (SjvO2) values <55 per cent may indicate elevated CMRO2, low CBF, systemic oxygen desaturation or cerebral ischaemia. Conversely, readings >75 per cent may represent high CBF, metabolic suppression or massive cerebral infarction.

  5. 5. Cerebral microdialysis is an evolving technique that can help to diagnose cerebral ischaemia, traumatic axonal injury and inflammatory insults at early stages. However, more research is needed to validate its clinical use.

Type
Chapter
Information
Intensive Care Medicine
The Essential Guide
, pp. 515 - 518
Publisher: Cambridge University Press
Print publication year: 2021

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References

References and Further Reading

De Georgia, MA. Brain tissue oxygen monitoring in neurocritical care. J Intensive Care Med 2015;30:473–83.CrossRefGoogle ScholarPubMed
Frontera, JA. Multimodality monitoring in critically ill neurologic patients. In: Reich, DL, Kahn, RA, Mittnacht, AJ, Lebowitz, AB, Stone, ME, Eisenkraft, JB (eds). Monitoring in Anesthesia and Perioperative Care. New York, NY: Cambridge University Press; 2011. pp. 237–48.Google Scholar
Makarenko, S, Griesdale, DE, Gooderham, P, Sekhon, MS. Multimodal neuromonitoring for traumatic brain injury: a shift towards individualized therapy. J Clin Neurosci 2016;26:813.CrossRefGoogle ScholarPubMed
Stocchetti, N, Roux, P, Vespa, P, et al. Clinical review: neuromonitoring – an update. Crit Care 2013;17:201.CrossRefGoogle ScholarPubMed
Tisdall, MM. Cerebral microdialysis: research technique or clinical tool. Br J Anaesth 2006;97:1825.CrossRefGoogle ScholarPubMed

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