Abstract
Background
The mortality rate of patients with brain oedema after malignant middle cerebral artery (MCA) infarction approaches 80 % without surgical intervention. Surgical treatment with ipsilateral decompressive hemicraniectomy (DHC) has been shown to dramatically improve survival rates. DHC currently lacks established inclusion criteria and additional research is needed to assess the impact of prognostic factors on functional outcome. The aim of this study was to assess the impact of prognostic factors on functional outcome.
Method
A retrospective cohort study was carried out including 46 patients who underwent DHC at the Karolinska University Hospital between 2004 and 2014. The maximum time to surgery was 5 days after symptom debut. The primary endpoint was a dichotomised score on the modified Rankin Scale (mRS) 3 months after surgery, with favourable outcome defined as mRS ≤ 4.
Results
When the study population was dichotomised according to the primary endpoint, a significant difference between the groups was seen in preoperative Glasgow Coma Score (GCS), blood glucose levels and the infarction’s involvement of the basal ganglia (p < 0.05). In a logistic regression model, preoperative GCS contributed significantly with a 59.6 % increase in the probability of favourable outcome for each point gained in preoperative GCS (p = 0.035).
Conclusions
The results indicate that preoperative GCS, blood glucose and the infarction’s involvement of the basal ganglia are strong predictors of clinical outcome. These factors should be considered when assessing the probable outcome of DHC, and additional research based on these factors may contribute to improved inclusion criteria for DHC.
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Karolinska Institutet provided financial support in the form of funding for the Department of Neurosurgery. The sponsor had no role in the design or conduct of this research.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. For this type of study formal consent is not required. The study was approved by the Ethical Review Board in Stockholm, Sweden.
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Comment
This is a quality manuscript and worthy of our consideration. It is gratifying to see that such good information can be mined from a retrospective study design, and I commend the authors for their rigorous and scientific approach to the subject.
There is useful information in this report that impacts our clinical decision making, specifically, that in cases of malignant MCA infarction, surgery is worthwhile, and that favorable surgical outcome can be predicted by three preoperative factors—a higher GCS score, lower blood glucose, and lack of basal ganglia involvement. Equally important to us is that other factors which we traditionally hold sacred don’t seem to impact outcome, like left/right infarct laterality, size of bone flap, age, sex, or time to surgery.
For our own practice in the USA we customarily let the patient’s family make the final decision. We have no hesitation to perform DHC for MCA infarcts, and we do it routinely. When we do it we try our best to do it early, before a falling GCS sets in, and before frank cerebral herniation has occurred.
We believe in this treatment as a strategy for patient salvage and we believe that this report extends our knowledge base regarding patient selection and the path to a successful outcome. The alternative in malignant MCA infarct, absent surgery, is customarily death, which we seek to avoid when we can.
Christopher M. Loftus
Illinois, USA
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von Olnhausen, O., Thorén, M., von Vogelsang, AC. et al. Predictive factors for decompressive hemicraniectomy in malignant middle cerebral artery infarction. Acta Neurochir 158, 865–873 (2016). https://doi.org/10.1007/s00701-016-2749-9
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DOI: https://doi.org/10.1007/s00701-016-2749-9