Cerebral Microdialysis-Based Interventions Targeting Delayed Cerebral Ischemia Following Aneurysmal Subarachnoid...

Area of Science:

• Neuroscience
• Critical Care Medicine
• Biochemistry

Background:

• Delayed cerebral ischemia (DCI) is a severe complication of subarachnoid hemorrhage (SAH), often leading to poor patient outcomes.
• Cerebral vasospasm is a primary cause of DCI following SAH.
• Cerebral microdialysis (CMD) offers a method to monitor brain energy metabolism, with the lactate/pyruvate ratio (LPR) indicating metabolic distress.

Purpose of the Study:

• To evaluate the effectiveness of a structured CMD protocol using LPR for guiding therapeutic interventions in SAH patients.
• To determine if CMD-guided management can reduce the incidence of DCI and improve patient outcomes.
• To assess the feasibility of implementing CMD monitoring in routine neurocritical care.

Main Methods:

• A prospective study included 49 SAH patients monitored with CMD between 2018 and 2020.
• The lactate/pyruvate ratio (LPR) was used to define minor (LPR ≥ 30) and major (LPR ≥ 40) metabolic events.
• Interventions were initiated based on CMD findings, and adherence to protocols was tracked.

Main Results:

• Over 7,223 CMD samples, 113 minor and 42 major metabolic events were recorded in 41 and 23 patients, respectively.
• Protocols were followed in 95% of major and 87% of minor events, with active interventions in 76% and 63% of cases.
• The incidence of DCI-related infarcts was 10%, with only two occurring in CMD-monitored regions, and metabolic status normalized after 59-69% of events.

Conclusions:

• CMD monitoring and protocol-driven interventions were successfully implemented in a majority of metabolic events.
• The observed low incidence of DCI suggests that CMD-guided management may be beneficial for SAH patients.
• Further studies are needed to confirm the role of CMD in clinical decision-making for DCI prevention.