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Published on: November 15, 2024
[Specificity of hyperglycemia treatment in acute stroke patients]
Ivan Bielen1, Ana Sruk, Damir Zalac
1Zavod za neurologiju, Opća bolnica Sveti Duh, Zagreb, Hrvatska.
Insights
Hyperglycemia in acute stroke patients is common and linked to poor outcomes, but its independent role and optimal treatment remain uncertain. Further research is needed for clear clinical guidelines.
Area of Science:
- Neurology
- Endocrinology
- Critical Care Medicine
Context:
- Hyperglycemia is prevalent in acute stroke patients, with varying clinical guideline recommendations between Europe and the USA.
- Existing literature suggests a correlation between hyperglycemia and adverse clinical outcomes, including impaired thrombolysis.
- Pathophysiological mechanisms linking hyperglycemia to cerebral damage are complex and not fully elucidated.
Purpose:
- To review key findings and unresolved questions regarding the acute management of hyperglycemia in stroke patients.
- To highlight discrepancies in current European and US clinical guidelines for stroke hyperglycemia treatment.
Summary:
- High prevalence of glucose dysregulation in stroke patients is noted, with evidence linking hyperglycemia to poor outcomes and thrombolysis effects.
- Contradictory data exist on hyperglycemia's direct role in cerebral damage, with potential involvement of lactic acidosis.
- Insulin therapy shows promise in critically ill patients, but definitive evidence for strict hyperglycemia control improving stroke outcomes is lacking.
Impact:
- Current evidence is insufficient to determine if hyperglycemia is an independent predictor of poor stroke outcome or a marker of severity.
- The exact blood glucose threshold for predicting adverse outcomes requires further definition.
- Ongoing trials are expected to refine clinical guidelines for managing hyperglycemia in acute stroke, addressing risks of hypoglycemia and metabolic disorders.
Introduction:
Although most of clinical studies suggest that hyperglycemia is associated with poor clinical outcome in acute stroke patients, there still are many theoretical and practical doubts that are reflected in some differences in treatment recommendations from clinical guidelines developed in Europe (European Stroke Initiative, Croatian Association for Neurovascular Disorders) and in the USA (American Stroke Association).
Purpose:
To point to the most important acts and doubts related to the acute treatment of hyperglycemia in stroke patients.
Methods:
On literature review, the following databases were used: Medline (1976-2006), National Guideline Clearinghouse and Stroke Trials Registry-Internet Stroke Center. Selection of the articles depended on clinical experience and knowledge of the authors.
Results:
The most important facts indicating a high prevalence of glucose regulation disturbances in stroke patients are highlighted, along with data on the reactive and iatrogenic pathophysiological mechanisms leading to hyperglycemia. Literature data that undoubtedly suggest an association of hyperglycemia with poor clinical outcome and the unfavorable effect of hyperglycemia on the outcome of thrombolysis are pointed out. Some contradictory data on the postulated pathophysiological mechanisms by which hyperglycemia causes cerebral damage are reviewed, especially regarding the role of tissue lactic acidosis induced by hyperglycemia. The favorable results of insulin therapy in critically ill patients are presented, along with the fact that there is still no definitive evidence that strict control of hyperglycemia can improve the outcome in stroke patients.
Discussion:
At present, it is not possible to claim whether hyperglycemia contributes to the poor outcome of acute stroke as an independent factor or it is just a marker of the disease severity. It seems that the unfavorable effect of hyperglycemia is not only associated with the level of the brain lactic acidosis. Rather, a complex interaction of several different mechanisms appears to be involved. The threshold of blood glucose concentration at which it becomes a predictor of unfavorable outcome has not yet been exactly established. The different levels of hyperglycemia recommended to be treated with insulin partly reflect different evaluation of the guidelines regarding the potential risks of insulin-induced hypoglycemia and further iatrogenic metabolic disorders. It might be expected that the results of ongoing randomized controlled trials should contribute to developing of more precise and more harmonized clinical guidelines for the treatment of hyperglycemia in stroke patients.
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