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BMC Neurology
Published in: BMC Neurology 1/2018

Open Access 01-12-2018 | Research article

Chronic kidney disease and poor outcomes in ischemic stroke: is impaired cerebral autoregulation the missing link?

Authors: Pedro Castro, Elsa Azevedo, Isabel Rocha, Farzaneh Sorond, Jorge M. Serrador

Published in: BMC Neurology | Issue 1/2018

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Abstract

Background

Chronic kidney disease increases stroke incidence and severity but the mechanisms behind this cerebro-renal interaction are mostly unexplored. Since both vascular beds share similar features, microvascular dysfunction could be the possible missing link. Therefore, we examined the relationship between renal function and cerebral autoregulation in the early hours post ischemia and its impact on outcome.

Methods

We enrolled 46 ischemic strokes (middle cerebral artery). Dynamic cerebral autoregulation was assessed by transfer function (coherence, phase and gain) of spontaneous blood pressure oscillations to blood flow velocity within 6 h from symptom-onset. Estimated glomerular filtration rate (eGFR) was calculated. Hemorrhagic transformation (HT) and white matter lesions (WML) were collected from computed tomography performed at presentation and 24 h. Outcome was evaluated with modified Rankin Scale at 3 months.

Results

High gain (less effective autoregulation) was correlated with lower eGFR irrespective of infarct side (p < 0.05). Both lower eGFR and higher gain correlated with WML grade (p < 0.05). Lower eGFR and increased gain, alone and in combination, progressively reduced the odds of a good functional outcome [ipsilateral OR = 4.39 (CI95% 3.15–25.6), p = 0.019; contralateral OR = 8.15 (CI95% 4.15–15.6), p = 0.002] and increased risk of HT [ipsilateral OR = 3.48 (CI95% 0.60–24.0), p = 0.132; contralateral OR = 6.43 (CI95% 1.40–32.1), p = 0.034].

Conclusions

Lower renal function correlates with less effective dynamic cerebral autoregulation in acute ischemic stroke, both predicting a bad outcome. The evaluation of serum biomarkers of renal dysfunction could have interest in the future for assessing cerebral microvascular risk and relationship with stroke complications.
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Metadata
Title
Chronic kidney disease and poor outcomes in ischemic stroke: is impaired cerebral autoregulation the missing link?
Authors
Pedro Castro
Elsa Azevedo
Isabel Rocha
Farzaneh Sorond
Jorge M. Serrador
Publication date
01-12-2018
Publisher
BioMed Central
Published in
BMC Neurology / Issue 1/2018
Electronic ISSN: 1471-2377
DOI
https://doi.org/10.1186/s12883-018-1025-4

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