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Changes on Dynamic Cerebral Autoregulation Are Associated with Delayed Cerebral Ischemia in Patients with Aneurysmal Subarachnoid Hemorrhage

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Subarachnoid Hemorrhage

Part of the book series: Acta Neurochirurgica Supplement ((NEUROCHIRURGICA,volume 127))

Abstract

Background: Early identification of vasospasm prior to symptom onset would allow prevention of delayed cerebral ischemia (DCI) in aneurysmal subarachnoid hemorrhage (aSAH). Dynamic cerebral autoregulation (DCA) is a noninvasive means of assessing cerebral blood flow regulation by determining independence of low-frequency temporal oscillations of systemic blood pressure (BP) and cerebral blood flow velocities (CBFV).

Methods: Eight SAH patients underwent prospectively a median of 7 DCA assessments consisting of continuous measurements of BCFV and BP. Transfer function analysis was applied to calculate average phase shift (PS) in low (0.07–0.2 Hz) frequency range for each hemisphere as continuous measure of DCA. Lower PS indicated poorer regulatory response. DCI was defined as a 2-point decrease in Glasgow Coma Score and/or infarction on CT.

Results: Three subjects developed symptomatic vasospasm with median time-to-DCI of 9 days. DCI was significantly associated with lower PS over the entire recording period (Wald = 4.28; p = 0.039). Additionally, there was a significant change in PS over different recording periods after adjusting for DCI (Wald = 15.66; p = 0.001); particularly, a significantly lower mean PS day 3–5 after bleed (14.22 vs 27.51; p = 0.05).

Conclusions: DCA might be useful for early detection of symptomatic vasospasm. A larger cohort study of SAH patients is currently underway.

Presentation at a conference: 14th International Conference on Neurovascular Events after Subarachnoid Hemorrhage or Vasospasm 2017.

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Abbreviations

ABP:

Arterial blood pressure

aSAH:

Aneurysmal subarachnoid hemorrhage

CBF:

Cerebral blood flow

CBFV:

Cerebral blood flow velocity

CPP:

Cerebral perfusion pressure

CT:

Computerized tomography

CTA:

Computerized tomography angiogram

DCA:

Dynamic cerebral autoregulation

DCI:

Delayed cerebral ischemia

EBI:

Early brain injury

FFT:

Fast Fourier transformed

GCS:

Glasgow Coma Scale

GEE:

Generalized estimating equations

MAP:

Mean arterial pressure

MCA:

Middle cerebral artery

TCD:

Transcranial Doppler

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Ortega-Gutierrez, S. et al. (2020). Changes on Dynamic Cerebral Autoregulation Are Associated with Delayed Cerebral Ischemia in Patients with Aneurysmal Subarachnoid Hemorrhage. In: Martin, R., Boling, W., Chen, G., Zhang, J. (eds) Subarachnoid Hemorrhage. Acta Neurochirurgica Supplement, vol 127. Springer, Cham. https://doi.org/10.1007/978-3-030-04615-6_22

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  • DOI: https://doi.org/10.1007/978-3-030-04615-6_22

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