What is the clinical evidence from this study?

Study design: Observational. Population: Malignant middle cerebral artery infarction (MMI) (n=70). Intervention: Signal complexity (SC) of intracranial pressure (ICP). Primary outcome: 6-month modified Rankin Scale (mRS) (OR 0.726, 95% CI 0.607-0.856, p=0.000232).

What question did this study set out to answer?

The study aims to explore the relationships between intracranial pressure, heart rate variability, and signal complexity in neurointensive care after decompressive craniectomy in patients with malignant middle cerebral artery infarction.

April 10, 2026Open Access

Intracranial Pressure Monitoring, Heart Rate Variability, Baroreflex Sensitivity, and Signal Complexity During Neurointensive Care after Decompressive Craniectomy in Malignant Middle Cerebral Artery Infarction

Key Result

Higher signal complexity of intracranial pressure independently correlated with better 6-month functional outcome (OR 0.726) in patients with MMI post-decompressive craniectomy.

Key Points

The study aims to explore the relationships between intracranial pressure, heart rate variability, and signal complexity in neurointensive care after decompressive craniectomy in patients with malignant middle cerebral artery infarction.
Observational study design
Monitoring of intracranial pressure and heart rate variability
Assessment of baroreflex sensitivity and signal complexity
Analysis of long-term outcomes post-decompressive craniectomy
Lower signal complexity correlated with a greater burden of secondary insults
Patients with low signal complexity faced worse long-term outcomes
Low signal complexity may indicate an overloaded compensatory mechanism, affecting tolerance to secondary insults

Study Design

Type

Observational (n=70)

Multicenter

Structured PICO

Does signal complexity correlate with secondary insults and long-term outcomes in patients with malignant middle cerebral artery infarction post-decompressive craniectomy?

Population

Patients with malignant middle cerebral artery infarction (MMI) post-decompressive craniectomy (DC) undergoing neurointensive care

Intervention

Monitoring of systemic and cerebral signal complexity (SC), heart rate variability, and baroreflex sensitivity

Outcome

Burden of secondary insults and long-term outcomesurrogate

Lower signal complexity in patients with malignant middle cerebral artery infarction post-decompressive craniectomy may serve as a prognostic marker for reduced tolerance to secondary insults and worse long-term outcomes.

Main Result

Effect estimate: OR 0.726 (95% CI 0.607-0.856)

p-value: p=0.000232

Limitations

Retrospective observational design
Relatively small cohort size (n=70) increasing the risk of type I and II errors
Sedation and mechanical ventilation present a confounder affecting autonomic function
Variables were aggregated into per-patient medians before correlation analyses, not considering temporal patterns
Multiple unadjusted statistical tests were performed

Abstract

Lower systemic and cerebral SC correlated with greater burden of secondary insults and worse long-term outcome in MMI post-DC. Low SC may indicate overloaded systemic and cerebral compensatory mechanisms, resulting in reduced tolerance for secondary insults. SC may aid prognostication and fine-tune NIC to identify and prevent autoregulatory insults.

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Cite This Study

Alhamdan et al. (Tue,) conducted a observational in Malignant middle cerebral artery infarction (MMI) (n=70). Signal complexity (SC) of intracranial pressure (ICP) was evaluated on 6-month modified Rankin Scale (mRS) (OR 0.726, 95% CI 0.607-0.856, p=0.000232). Higher signal complexity of intracranial pressure independently correlated with better 6-month functional outcome (OR 0.726) in patients with MMI post-decompressive craniectomy.

synapsesocial.com/papers/69d895486c1944d70ce06384 https://doi.org/https://doi.org/10.1007/s12028-026-02506-2

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