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Neurocritical Care
Published in: Neurocritical Care 1/2015

01-02-2015 | Original Article

Bilateral Failure of Cerebral Autoregulation is Related to Unfavorable Outcome After Subarachnoid Hemorrhage

Authors: Karol P. Budohoski, Marek Czosnyka, Peter J. Kirkpatrick, Matthias Reinhard, Georgios V. Varsos, Magdalena Kasprowicz, Mirosław Ząbek, John D. Pickard, Peter Smielewski

Published in: Neurocritical Care | Issue 1/2015

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Abstract

Backround

The extent of hemodynamic disturbances following subarachnoid hemorrhage (SAH) varies. We aim to determine the prognostic implications of unilateral and bilateral autoregulatory failure on delayed cerebral ischemia (DCI) and outcome.

Methods

Ninety-eight patients with aneurysmal SAH were recruited. Autoregulation was assessed using systolic flow index—Sxa. Interhemispheric difference in autoregulation was calculated to assess the spatial distribution and symmetry of autoregulatory changes. Assessment of interhemispheric difference in autoregulation in combination with overall autoregulation was used to measure the extent of autoregulatory impairment. Patients were dichotomized by the presence of DCI and 3-month mRS.

Results

Higher flow velocity and worse autoregulation (p < 0.0000001, 95 % CI 10.7–21.3 and p = 0.00001, 95 % CI 0.03–0.07 for difference in FV and Sxa, respectively) were found ipsilateral to the ischemic hemisphere or location of aneurysm (if no ischemia detected). DCI group had a higher interhemispheric difference of autoregulation than non-DCI group (p = 0.035, 95 % CI 0.003–0.08). 16/18 patients with unfavorable outcome vs. 17/72 with favorable outcome had overall poor autoregulation with low interhemispheric differences (p = 0.0013, χ 2). Unilateral autoregulatory failure was seen on a median day 3, bilateral on day 4, and vasospasm was detected on day 6.

Conclusions

Unilateral autoregulation failure was seen in patients who developed DCI (worse ipsilateral to the ischemic hemisphere). Bilateral autoregulation failure was seen more frequently in patients with unfavorable outcome. Analysis of the temporal profile showed unilateral dysautoregulation as the primary event predisposing to DCI, which in selected cases led to bilateral failure and unfavorable outcomes.
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Metadata
Title
Bilateral Failure of Cerebral Autoregulation is Related to Unfavorable Outcome After Subarachnoid Hemorrhage
Authors
Karol P. Budohoski
Marek Czosnyka
Peter J. Kirkpatrick
Matthias Reinhard
Georgios V. Varsos
Magdalena Kasprowicz
Mirosław Ząbek
John D. Pickard
Peter Smielewski
Publication date
01-02-2015
Publisher
Springer US
Published in
Neurocritical Care / Issue 1/2015
Print ISSN: 1541-6933
Electronic ISSN: 1556-0961
DOI
https://doi.org/10.1007/s12028-014-0032-6

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