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Treatment options for large hemispheric stroke
T Steiner1, P Ringleb, W Hacke
1Department of Neurology, Heidelberg University Clinic, Heidelberg, Germany.
Abstract:
Some stroke patients suffering acute middle cerebral artery (MCA) infarction develop massive brain edema and herniation, a condition known as malignant MCA infarction. Severe swelling increases intracranial pressure (ICP) and leads to progressive brainstem dysfunction. Once ICP reaches critical values (>30 mm Hg) herniation occurs, usually within 2 to 5 days. Patients rarely survive (80% mortality) with standard treatment, and those who do are often severely disabled. Malignant MCA infarction is often missed by neurologists, despite well-defined clinical and neuroimaging (CT scan) diagnostic criteria. After diagnosis, conventional treatments such as osmotherapy, barbiturates, buffers, and hyperventilation center on reducing ICP. The goal of hyperosmolar therapy is to increase the serum osmolarity to approximately 315-320 mOsm/L. Enteric glycerol is used routinely to reduce ICP. In more severe cases and when glycerol fails, mannitol may be administered. Other therapies are also available, including hypertonic saline solution, THAM (Tris-hydroxy-methyl-aminomethane) buffer, and high-dose barbiturates. Hyperventilation also helps reduce ICP. All measures work effectively for a short time only. Other approaches to control elevated ICP, including decompression surgery and hypothermia, have shown promising results. In the Heidelberg decompression surgery trial, mortality in surgically treated patients was significantly lower (32%) than in non-treated patients (76%) despite conventional treatment. Importantly, of the surviving treated patients, 66% were rated independent with only mild to moderate disability. Moderate hypothermia (33-36 degrees C) has recently been shown to be effective in severe MCA infarction. Hypothermia induction within 14 hours of ischemic injury and maintained for 72 hours significantly reduced ICP and mortality (44%).
Insights
Malignant middle cerebral artery (MCA) infarction causes severe brain swelling and high mortality. Decompression surgery and hypothermia show promise in reducing intracranial pressure and improving survival rates for stroke patients.
Area of Science:
- Neurology
- Neurosurgery
- Critical Care Medicine
Background:
- Malignant middle cerebral artery (MCA) infarction leads to severe brain edema, increased intracranial pressure (ICP), and herniation.
- This condition has a high mortality rate (80%) with standard treatments, and survivors often experience significant disability.
- Diagnosis can be challenging, with the condition often missed despite clear clinical and CT scan criteria.
Purpose of the Study:
- To review current and emerging treatments for malignant MCA infarction.
- To highlight the effectiveness of decompression surgery and hypothermia in managing elevated ICP and improving patient outcomes.
Main Methods:
- Review of conventional treatments for reducing ICP, including osmotherapy, barbiturates, buffers, and hyperventilation.
- Analysis of data from the Heidelberg decompression surgery trial.
- Evaluation of moderate hypothermia as a therapeutic intervention.
Main Results:
- Conventional ICP-reducing therapies offer only short-term relief.
- Decompression surgery significantly reduced mortality from 76% to 32% in one trial, with 66% of survivors achieving independence.
- Moderate hypothermia (33-36°C) reduced ICP and mortality (to 44%) when initiated within 14 hours of ischemic injury and maintained for 72 hours.
Conclusions:
- Malignant MCA infarction requires aggressive management beyond standard ICP-lowering therapies.
- Decompression surgery and moderate hypothermia represent promising therapeutic strategies with the potential to significantly improve survival and functional outcomes.
- Further research and clinical application of these advanced treatments are warranted.