In 2007, the Society of Thoracic Surgeons and the Society of Cardiovascular Anesthesiologists issued clinical practice guidelines on perioperative blood transfusion and blood conservation in cardiac surgery.1 In a 2009 follow-up survey of clinicians considered the primary target group of these guidelines, more than two-thirds of respondents indicated some degree of familiarity with the guidelines.2 However, reported changes in practice resulting from the guidelines were limited, and about half of the respondents indicated that they did not adhere to the recommended reduced hemoglobin cutoff points as transfusion triggers.
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