Delayed Ischemic Neurologic Deficit after Aneurysmal Subarachnoid Hemorrhage

Area of Science:

• Neuroscience
• Critical Care Medicine
• Neurology

Background:

• Delayed ischemic neurologic deficit (DIND) significantly impacts outcomes in aneurysmal subarachnoid hemorrhage (SAH) survivors.
• Clinical vasospasm (VS) affects approximately 30% of SAH survivors, representing a major preventable cause of morbidity.

Purpose of the Study:

• To review current strategies for the prevention, diagnosis, and management of DIND following SAH.
• To highlight advancements in monitoring technologies and potential future diagnostic biomarkers for DIND.

Main Methods:

• Literature review of diagnostic and therapeutic approaches for DIND in SAH.
• Discussion of serial neurological examination, advanced multimodal monitoring (EEG, microdialysis, ICP), and emerging genetic biomarkers.
• Analysis of pharmacological (nimodipine) and endovascular treatments for vasospasm and DIND.

Main Results:

• Serial neurological examination remains crucial for detecting new deficits.
• Multimodality monitoring offers advanced insights into brain physiology for comatose patients.
• Nimodipine is the standard for VS prevention, while intra-arterial vasodilators are used for rescue therapy, though evidence comparing endovascular techniques is limited.

Conclusions:

• Effective DIND management hinges on prevention, early identification, and advanced monitoring.
• Genetic biomarkers may offer future early DIND prediction.
• Clinical expertise and diligent neurointensive care are paramount for favorable long-term outcomes in SAH patients.