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The origin of hyperlactataemia during critical illness is complex but its presence can provide an indicator of inadequate tissue oxygen delivery. Cardiopulmonary bypass (CPB) represents a unique situation where systemic oxygen delivery can be directly measured and controlled. In the previous issue of Critical Care, Ranucci and colleagues use this phenomenon to identify independent variables associated with the development of hyperlactataemia during CPB. In doing so they highlight the complexity of interpreting hyperlactataemia during critical illness and provide further evidence of its association with worse postoperative morbidity.

The origin and interpretation of hyperlactataemia during low oxygen delivery states.