The big question is whether the benefits of treatment with these drugs are offset by adverse effects, in particular thrombosis leading to an excess risk of heart attack and stroke. This has been a particular concern with aprotinin and some studies that did not use randomisation found an increased risk of these complications with this drug. However, this Cochrane Review of randomised controlled trials found no increase in the risk of thrombosis with aprotinin or tranexamic acid.
"Our review of over 200 clinical trials found that using anti-fibrinolytic drugs during surgery reduced bleeding and reduced the need for transfusions of red blood cells. Importantly they did not appear to increase the risk of serious adverse effects," says lead researcher Professor David Henry, of the University of Newcastle, Waratah, Australia.
"This is an extremely important finding," says Professor Mike Clarke, the UK Cochrane Centre Director. "It shows very strongly that anti-fibrinolytics, which are cheap, can dramatically reduce the need for blood transfusion. Blood is scarce, expensive and transfusions can be dangerous, so this is likely to be a very important finding globally."