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A best evidence topic in cardiac surgery was written according to a structured protocol. The question addressed was ‘Which cannulation (ascending aortic cannulation or peripheral arterial cannulation) is better for acute type A aortic dissection surgery?’ Altogether 393 papers were found using the reported search, of which 14 represented the best evidence to answer the clinical question. The authors, journal, date and country of publication, patient group studied, study type, relevant outcomes and results of these papers are tabulated. Femoral artery cannulation has the highest rate of mortality, stroke rate and other complications including retrograde cerebral embolization, organ malperfusion and perfusion of the false lumen. Five out of 14 papers were found to be reporting in favour of axillary (or subclavian) artery cannulation over femoral artery cannulation. In a total of 1829 patients evaluated in these studies …