Cerebral Hyperperfusion Syndrome: Scoping Review with ☸️SAIMSARA.

Name: SAIMSARA Evidence Object vascular::CEREBRAL_HYPERPERFUSION_PM
Creator: SAIMSARA
License: https://saimsara.com/license/

SAIMSARA

doi:10.62487/saimsara6ed87781

SAIMSARA Journal

Machine-Readable Science • ISSN 3054-3991

Cerebral Hyperperfusion Syndrome: Scoping Review with ☸️SAIMSARA.

Cardiac & Vascular Health

Issue 1, Volume 1, 2026

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DOI: 10.62487/saimsara6ed87781

Editorial note

• Last update: 2026-06-04 11:57:04

What is this paper about

Cerebral hyperperfusion syndrome is not just a rare post-procedural complication — it is a dangerous failure of cerebrovascular autoregulation when restored flow overwhelms chronically exhausted brain perfusion reserve. This full SAIMSARA read maps 475 original studies, 192 key references, and 477,299 observations to show where CHS risk emerges after carotid, moyamoya, bypass, thrombectomy, and posterior circulation revascularization — and why blood-pressure governance, perfusion monitoring, staged strategies, and seizure vigilance may decide the clinical outcome.

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Abstract: To synthesize the structured evidence on cerebral hyperperfusion syndrome (CHS), emphasizing recurring mechanisms, clinical contexts, predictors, monitoring approaches, preventive strategies, and downstream outcomes relevant to diagnosis and perioperative management. The review uses 192 references and builds its evidence map from 475 original studies with 477299 total participants/sample observations (topic-deduplicated ΣN). This scoping review indicates that CHS is best conceptualized as a reperfusion-autoregulation mismatch occurring when restored flow meets chronically exhausted cerebrovascular reserve, a signal that recurs across carotid, bypass, and moyamoya revascularization contexts. The most consistent actionable levers were preoperative hemodynamic risk stratification, aggressive perioperative blood pressure governance, and early multimodal monitoring, with an immediate cerebral blood flow (CBF) increase greater than 48.2% after carotid artery stenting (CAS) and preoperative hypertension (OR 4.705) illustrating the predictive value of hemodynamic and clinical variables. Preventive strategies including staged angioplasty and prophylactic dexmedetomidine (2.5% vs 13.75% CHS after CAS) support a role for anticipatory perioperative interventions in high-risk patients. Heterogeneous CHS definitions and predominantly small observational cohorts limit certainty. Future multicenter prospective studies with standardized severity-stratified endpoints and validated multimodal prediction models are needed to translate these recurring signals into reproducible perioperative pathways.

Keywords: Cerebral hyperperfusion syndrome; Carotid endarterectomy; Carotid artery stenting; Moyamoya disease; Cerebral revascularization; Cerebrovascular reserve; Circle of Willis; Transcranial Doppler; Arterial spin labeling; Hypertension

Review Stats

Final search date and database lock: 2026-05-26 19:47:27 CEST
Plan: Pro (expanded craft tokens; source: PubMed)
Source: PubMed
Total Abstracts/Papers: 707
Downloaded Abstracts/Papers: 707
Included original and non-original Abstracts/Papers (all): 586
Included original Abstracts/Papers (Vote counting by direction of effect): 475
Reference Index (links used in paper): 192
Total participants/sample observations (topic deduplicated ΣN): 477299

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Reference Index (192)

[1] Cerebral hyperperfusion syndrome. — https://doi.org/10.1016/s1474-4422(05)70251-9
[2] Cerebral Hyperperfusion Syndrome and Related Conditions. — https://doi.org/10.1159/000511307
[3] Update on cerebral hyperperfusion syndrome. — https://doi.org/10.1136/neurintsurg-2019-015621
[4] Cerebrovascular Reserve Predicts the Cerebral Hyperperfusion Syndrome After Carotid Endarterectomy. — https://doi.org/10.1016/j.jstrokecerebrovasdis.2020.105318
[5] Cerebral hyperperfusion syndrome after endovascular reperfusion therapy for medium vessel occlusion: A case report. — https://doi.org/10.1016/j.radcr.2024.01.087
[6] Cerebral hyperperfusion syndrome and intracranial hemorrhage after carotid endarterectomy or carotid stenting: A meta-analysis. — https://doi.org/10.1016/j.jns.2017.08.020
[7] Cerebral Hyperperfusion Syndrome After Revascularization Surgery in Patients with Moyamoya Disease: Systematic Review and Meta-Analysis. — https://doi.org/10.1016/j.wneu.2019.11.065
[8] Risk Factors for Cerebral Hyperperfusion Syndrome After Combined Revascularization in Adult Patients with Moyamoya Disease. — https://doi.org/10.2174/0115672026287201240110092653

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