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Gamma Aminobutyric Acid (GABA) Receptor Agonists for Acute Stroke (Review)

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Gamma Aminobutyric Acid (GABA) Receptor Agonists for Acute Stroke (Review) Gamma aminobutyric acid (GABA) receptor agonists for acute stroke (Review) Liu J, Wang LN This is a reprint of a Cochrane review, prepared and maintained by The Cochrane Collaboration and published in The Cochrane Library 2013, Issue 2 http://www.thecochranelibrary.com Gamma aminobutyric acid (GABA) receptor agonists for acute stroke (Review) Copyright © 2013 The Cochrane Collaboration. Published by John Wiley & Sons, Ltd. TABLE OF CONTENTS HEADER....................................... 1 ABSTRACT ...................................... 1 PLAINLANGUAGESUMMARY . 2 BACKGROUND .................................... 2 OBJECTIVES ..................................... 3 METHODS ...................................... 3 RESULTS....................................... 5 Figure1. ..................................... 6 DISCUSSION ..................................... 9 AUTHORS’CONCLUSIONS . 9 ACKNOWLEDGEMENTS . 9 REFERENCES ..................................... 10 CHARACTERISTICSOFSTUDIES . 12 DATAANDANALYSES. 19 Analysis 1.1. Comparison 1 Efficacy and safety for acute stroke, Outcome 1 Death or dependency. 21 Analysis 1.2. Comparison 1 Efficacy and safety for acute stroke, Outcome 2 Somnolence. 22 Analysis 1.3. Comparison 1 Efficacy and safety for acute stroke, Outcome 3 Rhinitis. 23 Analysis 1.4. Comparison 1 Efficacy and safety for acute stroke, Outcome 4 Functional independence. 24 Analysis 2.1. Comparison 2 Efficacy for acute ischemic stroke, Outcome 1 Death or dependency. 25 Analysis 2.2. Comparison 2 Efficacy for acute ischemic stroke, Outcome 2 Functional independence. 26 Analysis 3.1. Comparison 3 Efficacy for acute hemorrhagic stroke, Outcome 1 Death or dependency. 27 Analysis 3.2. Comparison 3 Efficacy for acute hemorrhagic stroke, Outcome 2 Functional independence. 28 Analysis 4.1. Comparison 4 Efficacy for TACS, Outcome 1 Functional independence. 29 Analysis 5.1. Comparison 5 Efficacy for early-treated acute stroke, Outcome 1 Functional independence. 30 APPENDICES ..................................... 30 CONTRIBUTIONSOFAUTHORS . 32 DECLARATIONSOFINTEREST . 32 SOURCESOFSUPPORT . 32 INDEXTERMS .................................... 32 Gamma aminobutyric acid (GABA) receptor agonists for acute stroke (Review) i Copyright © 2013 The Cochrane Collaboration. Published by John Wiley & Sons, Ltd. [Intervention Review] Gamma aminobutyric acid (GABA) receptor agonists for acute stroke Jia Liu1, Lu-Ning Wang1 1Department of Geriatric Neurology, Chinese PLA General Hospital, Beijing, China Contact address: Jia Liu, Department of Geriatric Neurology, Chinese PLA General Hospital, Fuxing Road 28, Beijing, 100853, China. [email protected]. Editorial group: Cochrane Stroke Group. Publication status and date: New, published in Issue 2, 2013. Review content assessed as up-to-date: 11 September 2012. Citation: Liu J, Wang LN. Gamma aminobutyric acid (GABA) receptor agonists for acute stroke. Cochrane Database of Systematic Reviews 2013, Issue 2. Art. No.: CD009622. DOI: 10.1002/14651858.CD009622.pub2. Copyright © 2013 The Cochrane Collaboration. Published by John Wiley & Sons, Ltd. ABSTRACT Background Gamma aminobutyric acid (GABA) receptor agonists have been shown to have a neuroprotectant effect in reducing infarct size and improving functional outcome in animal models of cerebral ischemia. However, the sedation effects of GABA receptor agonists have limited their wider application in acute stroke patients due to the potential risk of stupor. Objectives To determine the efficacy and safety of GABA receptor agonists in the treatment of acute stroke. Search methods We searched the Cochrane Stroke Group Trials Register (January 2012), the Cochrane Central Register of Controlled Trials (CENTRAL) (The Cochrane Library 2012, Issue 1), MEDLINE (1949 to March 2012), EMBASE (1980 to March 2012), CINAHL (1982 to March 2012), AMED (1985 to March 2012) and 11 Chinese databases (March 2012). In an effort to identify further published, unpublished and ongoing trials we searched ongoing trials registers, reference lists and relevant conference proceedings, and contacted authors and pharmaceutical companies. Selection criteria We included randomized controlled trials (RCTs) investigating GABA receptor agonists versus placebo for acute stroke patients (within 12 hours after stroke onset), with the outcomes of death or dependency, functional independence and adverse events. Data collection and analysis Two review authors independently screened the titles and abstracts of identified records, selected studies for inclusion, extracted eligible data, cross-checked the data for accuracy and assessed the methodological quality. Main results We included five trials with 3838 patients. The methodological quality of the included trials was generally good, with low risk of bias. Four trials measured death and dependency at three months in chlormethiazole versus placebo without significant difference (risk ratio (RR) 1.03, 95% confidence interval (CI) 0.95 to 1.11). One trial measured this outcome between diazepam and placebo (RR 0.94, 95% CI 0.82 to 1.07). In the subgroup analysis of total anterior circulation syndrome (TACS), a higher percentage of functional independence was found in the chlormethiazole group (RR 1.33, 95% CI 1.09 to 1.64). The frequent adverse events related to chlormethiazole were somnolence (RR 4.56, 95% CI 3.50 to 5.95) and rhinitis (RR 4.75, 95% CI 2.67 to 8.46). Gamma aminobutyric acid (GABA) receptor agonists for acute stroke (Review) 1 Copyright © 2013 The Cochrane Collaboration. Published by John Wiley & Sons, Ltd. Authors’ conclusions This review does not provide the evidence to support the use of GABA receptor agonists (chlormethiazole or diazepam) for the treatment of patients with acute ischemic or hemorrhagic stroke. Chlormethiazole appeared to be beneficial in improving functional independence in patients with TACS according to the subgroup analysis, but this result must be interpreted with great caution. More well-designed RCTs with large samples of TACS would be required for further confirmation. However, somnolence and rhinitis are frequent adverse events related to chlormethiazole. PLAIN LANGUAGE SUMMARY Gamma aminobutyric acid (GABA) receptor agonists for acute stroke GABA receptor agonists are a type of neuroprotective agent that may help protect the brain in the treatment of acute stroke. This class of drugs, which includes diazepam and chlormethiazole, are traditional sedatives that have been used for several decades and have been found to be beneficial in animal models of stroke. However, the sedation effect of GABA receptor agonists can be harmful for acute stroke patients with the potential risk of causing stupor. We included five trials with 3838 patients to assess the benefit and safety of GABA receptor agonists for patients with acute stroke. In conclusion, there was no convincing evidence to support the use of GABA receptor agonists for the treatment of patients with acute ischemic or hemorrhagic stroke. The most frequent adverse events of chlormethiazole were drowsiness and rhinitis. BACKGROUND (ischemic but still viable tissue). The most common neuropro- tectants include excitatory amino acid antagonists, gangliosides, calcium channel antagonists, lubeluzole, methylxanthine deriva- Description of the condition tives and tirilazad - each with different modes of action. It is dis- appointing that none of these treatments has been confirmed to Acute stroke is defined as a clinical syndrome of sudden onset be effective in the acute phase of stroke (Bath 2001; Bath 2004; of focal or global disturbance of central nervous system function Candelise 2001; Gandolfo 2002; Horn 2000; Muir 2003). There- due to an interruption of the cerebral circulation (Warlow 2001). fore, it is necessary to examine other potential neuroprotectants Ischemic stroke (80% of all strokes) is the most frequent type, for stroke. Gamma aminobutyric acid (GABA) receptor agonists followed by intracerebral hemorrhage (15%) and subarachnoid (e.g. diazepam and chlormethiazole) are traditional sedatives that hemorrhage (5%). The estimated annual incidence of stroke is have been used for several decades. They have also been found 0.25% and increases with ageing (Simon 2009; WHO 2011). to be effective in reducing infarct size in histology and improving Two-thirds of all strokes occur in those older than 65 years (AHA functional outcome in animal models of cerebral ischemia (Gasior 2002). The common risk factors include smoking, hypertension, 2004; Marshall 2003; Sydserff 2002). diabetes, carotid stenosis, hypercholesterolemia, hyperhomocys- teinemia, alcohol abuse and a high-fat diet (Cruz-Flores 2011). The prognosis is poor, with one-third of patients dying and one- How the intervention might work third left with permanent disability (WHO 2011). In addition, stroke is a costly condition incurring treatment, care and indirect GABA is the main inhibitory neurotransmitter in the central costs (Saka 2009). nervous system and acts by reducing the depolarization-induced and ischemia-induced glutamate release (Nelson 2000; Vaishnav 2002). Firstly, GABA can trigger hyperpolarization of neurons through anion channels (GABAA) and presynaptic G-protein cou- Description of the intervention pled receptors (GABAB )(Wilby 2004). This hyperpolarization Neuroprotective agents have attracted a lot of attention for the counteracts the depolarization which is the initiating event in the treatment of acute stroke, and are expected to be helpful in pro- biochemical ischemic cascade (Tuttolomondo
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