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Jakobsen R, Halfeld Nielsen T, Granfeldt A, et al. A technique for continuous bedside monitoring of global cerebral energy state. Intensive Care Med Exp. 2016;4(1):3doi: 10.1186/s40635-016-0077-2.
Jakobsen, R., Halfeld Nielsen, T., Granfeldt, A., Toft, P., & Nordström, C. H. (2016). A technique for continuous bedside monitoring of global cerebral energy state. Intensive care medicine experimental, 4(1), 3. https://doi.org/10.1186/s40635-016-0077-2
Jakobsen, Rasmus, et al. "A technique for continuous bedside monitoring of global cerebral energy state." Intensive care medicine experimental vol. 4,1 (2016): 3. doi: https://doi.org/10.1186/s40635-016-0077-2
Jakobsen R, Halfeld Nielsen T, Granfeldt A, Toft P, Nordström CH. A technique for continuous bedside monitoring of global cerebral energy state. Intensive Care Med Exp. 2016 Dec;4(1):3. doi: 10.1186/s40635-016-0077-2. Epub 2016 Jan 20. PMID: 26791144; PMCID: PMC4720625.
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Intensive Care Med Exp. 2016 Dec;4(1):3. doi: 10.1186/s40635-016-0077-2. Epub 2016 Jan 20.

A technique for continuous bedside monitoring of global cerebral energy state.

Intensive care medicine experimental

Rasmus Jakobsen, Troels Halfeld Nielsen, Asger Granfeldt, Palle Toft, Carl-Henrik Nordström

Affiliations

  1. Department of Anaesthesia and Intensive care, Odense University Hospital, Sdr. Boulevard 29, 5000, Odense C, Denmark. [email protected].
  2. Department of Neurosurgery, Odense University Hospital, Sdr. Boulevard 29, 5000, Odense C, Denmark. [email protected].
  3. Department of Anesthesiology, Regional Hospital of Randers, Skovlyvej 1, 8930, Randers NØ, Denmark. [email protected].
  4. Department of Anaesthesia and Intensive care, Odense University Hospital, Sdr. Boulevard 29, 5000, Odense C, Denmark. [email protected].
  5. Department of Neurosurgery, Odense University Hospital, Sdr. Boulevard 29, 5000, Odense C, Denmark. [email protected].

PMID: 26791144 PMCID: PMC4720625 DOI: 10.1186/s40635-016-0077-2

Abstract

BACKGROUND: Cerebral cytoplasmatic redox state is a sensitive indicator of cerebral oxidative metabolism and is conventionally evaluated from the extracellular lactate/pyruvate (LP) ratio. In the present experimental study of global cerebral ischemia induced by hemorrhagic shock, we investigate whether the LP ratio obtained from microdialysis of cerebral venous blood may be used as a surrogate marker of global cerebral energy state.

METHODS: Six female pigs were anesthetized and vital parameters were recorded. Microdialysis catheters were placed in the left parietal lobe, the superior sagittal sinus, and the femoral artery. Hemorrhagic shock was achieved by bleeding the animals to a mean arterial pressure (MAP) of approximately 40 mmHg and kept at a MAP of about 30-40 mmHg for 90 min. The animals were resuscitated with autologous whole blood followed by 3 h of observation.

RESULTS: The LP ratio obtained from the intracerebral and intravenous catheters immediately increased during the period of hemorrhagic shock while the LP ratio in the arterial blood remained close to normal levels. At the end of the experiment, median LP ratio (interquartile range) obtained from the intracerebral, intravenous, and intra-arterial microdialysis catheters were 846 (243-1990), 309 (103-488), and 27 (21-31), respectively. There was a significant difference in the LP ratio obtained from the intravenous location and the intra-arterial location (P < 0.001).

CONCLUSIONS: During cerebral ischemia induced by severe hemorrhagic shock, intravascular microdialysis of the draining venous blood will exhibit changes of the LP ratio revealing the deterioration of global cerebral oxidative energy metabolism. In neurocritical care, this technique might be used to give information regarding global cerebral energy metabolism in addition to the regional information obtained from intracerebral microdialysis catheters. The technique might also be used to evaluate cerebral energy state in various critical care conditions when insertion of an intracerebral microdialysis catheter may be contraindicated, e.g., resuscitation after cardiac standstill, open-heart surgery, and multi-trauma.

Keywords: Cerebral energy state; Hemorrhagic shock; Ischemia; Microdialysis

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