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JOURNAL ARTICLE
META-ANALYSIS
REVIEW
Protamine Reduces Bleeding Complications without Increasing the Risk of Stroke after Carotid Endarterectomy: A Meta-analysis.
European Journal of Vascular and Endovascular Surgery 2016 September
OBJECTIVES: The aim was to evaluate the safety and efficacy of heparin reversal with protamine after completion of carotid endarterectomy (CEA), summarising the available data from both randomised and non-randomised studies.
METHODS: The study was a meta-analysis. Pooled odds ratios (ORs) with 95% confidence intervals (95% CIs) were calculated for the outcomes of stroke and wound haematoma among patients receiving or not receiving protamine after CEA. Meta-regression analysis was performed to examine whether the documented differences were modified by potentially meaningful patient related or procedure related predictors, namely publication year, general anesthesia used, number of patients treated, mean age (years), males, neurological symptoms, use of patch, and use of shunt.
RESULTS: Seven studies were included in the meta-analysis reporting on 3,817 patients receiving protamine after CEA and 6,070 patients not receiving protamine for heparin reversal. Only one study was randomised. A statistically significant reduction in wound haematoma requiring re-operation was recorded after heparin reversal with protamine in patients undergoing CEA (OR, 0.42, 95% CI, 0.22-0.80, p = .008). In contrast, no significant difference was observed in stroke rates between groups of patients that received and did not receive protamine (OR, 0.71, 95% CI, 0.49-1.03, p = .07). Meta-regression analysis did not reveal any significant effect mediated by the modifiers examined.
CONCLUSION: On the basis of the available data, heparin reversal with protamine seems to reduce the risk of wound haematoma, without increasing the risk of procedural stroke. However, taking into account the limitations of the analysis, further studies are needed to increase the level of evidence provided by the current meta-analysis.
METHODS: The study was a meta-analysis. Pooled odds ratios (ORs) with 95% confidence intervals (95% CIs) were calculated for the outcomes of stroke and wound haematoma among patients receiving or not receiving protamine after CEA. Meta-regression analysis was performed to examine whether the documented differences were modified by potentially meaningful patient related or procedure related predictors, namely publication year, general anesthesia used, number of patients treated, mean age (years), males, neurological symptoms, use of patch, and use of shunt.
RESULTS: Seven studies were included in the meta-analysis reporting on 3,817 patients receiving protamine after CEA and 6,070 patients not receiving protamine for heparin reversal. Only one study was randomised. A statistically significant reduction in wound haematoma requiring re-operation was recorded after heparin reversal with protamine in patients undergoing CEA (OR, 0.42, 95% CI, 0.22-0.80, p = .008). In contrast, no significant difference was observed in stroke rates between groups of patients that received and did not receive protamine (OR, 0.71, 95% CI, 0.49-1.03, p = .07). Meta-regression analysis did not reveal any significant effect mediated by the modifiers examined.
CONCLUSION: On the basis of the available data, heparin reversal with protamine seems to reduce the risk of wound haematoma, without increasing the risk of procedural stroke. However, taking into account the limitations of the analysis, further studies are needed to increase the level of evidence provided by the current meta-analysis.
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