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Suboptimal Cerebral Perfusion is Associated with Ischemia After Intracerebral Hemorrhage

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Abstract

Background

Remote ischemic lesions on diffusion-weighted imaging (DWI) occur in one third of patients with intracerebral hemorrhage (ICH) and are associated with worse outcomes. The etiology is unclear and not solely due to blood pressure reduction. We hypothesized that impaired cerebrovascular autoregulation and hypoperfusion below individualized lower limits of autoregulation are associated with the presence of DWI lesions.

Methods

This was a retrospective, single-center study of all primary ICH with intraparenchymal pressure monitoring within 10 days from onset and subsequent magnetic resonance imaging. Pressure reactivity index was calculated as the correlation coefficient between mean arterial pressure and intracranial pressure. Optimal cerebral perfusion pressure (CPPopt) is the cerebral perfusion pressure (CPP) with the lowest corresponding pressure reactivity index. The difference between CPP and CPPopt, time spent below the lower limit of autoregulation (LLA), and time spent above the upper limit of autoregulation (ULA) were calculated by using mean hourly physiologic data. Univariate associations between physiologic parameters and DWI lesions were analyzed by using binary logistic regression.

Results

A total of 505 h of artifact-free data from seven patients without DWI lesions and 479 h from six patients with DWI lesions were analyzed. Patients with DWI lesions had higher intracranial pressure (17.50 vs. 10.92 mm Hg; odds ratio 1.14, confidence interval 1.01–1.29) but no difference in mean arterial pressure or CPP compared with patients without DWI lesions. The presence of DWI lesions was significantly associated with a greater percentage of time spent below the LLA (49.85% vs. 14.70%, odds ratio 5.77, confidence interval 1.88–17.75). No significant association was demonstrated between CPPopt, the difference between CPP and CPPopt, ULA, LLA, or time spent above the ULA between groups.

Conclusions

Blood pressure reduction below the LLA is associated with ischemia after acute ICH. Individualized, autoregulation-informed targets for blood pressure reduction may provide a novel paradigm in acute management of ICH and require further study.

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Acknowledgements

We would like to thank the physicians and nurses of the neurology and neurosurgery department for their support of this project.

Funding

This study received no external funding.

Author information

Authors and Affiliations

Authors

Contributions

Mohamed Ridha MD contributed to data analysis, interpretation, and drafting of the manuscript. Murad Megjhani PhD contributed to the analysis and interpretation of data. Daniel Nametz contributed to data acquisition. Soon Bin Kwon PhD contributed to data interpretation and review. Angela Velazquez MD contributed to data acquisition. Shivani Ghoshal MD contributed to critical intellectual review of the manuscript. Sachin Agarwal MD MPH contributed to critical intellectual review of the manuscript. Jan Claassen MD contributed to critical intellectual review of the manuscript. David J. Roh MD contributed to critical intellectual review of the manuscript. E. Sander Connolly Jr MD contributed to critical intellectual review of the manuscript. Soojin Park MD contributed to design conception, data interpretation, and critical intellectual review of the manuscript. The authors approved of the final manuscript.

Corresponding author

Correspondence to Mohamed Ridha.

Ethics declarations

Conflict of interest

SP is supported by National Institutes of Health grants R01NS129760-01 and R01NS131606-01. JC is supported by grant funding from R01NS106014-02S1, R21 NS128326-01, R03 NS112760, R01NS106014-02S2. He received consulting fees from Marinus and is a minority shareholder at iCE Neurosystems. The remaining authors declare no conflict of interest.

Ethical Approval/Informed Consent

The study was approved by the institutional review board of Columbia University Medical Center and was performed in accordance with the ethical standards as outlined in the 1964 Declaration of Helsinki and its amendments. Informed consent was obtained from the patient representative.

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Ridha, M., Megjhani, M., Nametz, D. et al. Suboptimal Cerebral Perfusion is Associated with Ischemia After Intracerebral Hemorrhage. Neurocrit Care (2023). https://doi.org/10.1007/s12028-023-01863-6

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