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  • Lactate as a marker of energy failure in critically ill patients: hypothesis.

Lactate as a marker of energy failure in critically ill patients: hypothesis.

Critical care (London, England) (2005-12-17)
Franco Valenza, Gabriele Aletti, Tommaso Fossali, Giorgio Chevallard, Francesca Sacconi, Manuela Irace, Luciano Gattinoni
ABSTRACT

Lactate measurement in the critically ill has been traditionally used to stratify patients with poor outcome. However, plasma lactate levels are the result of a finely tuned interplay of factors that affect the balance between its production and its clearance. When the oxygen supply does not match its consumption, organisms such as man who are forced to produce ATP for their integrity adapt in many different ways up to the point when energy failure occurs. Lactate, being part of the adaptive response, may then be used to assess the severity of the supply/demand imbalance. In such a scenario, the time to intervention becomes relevant: early and effective treatment may allow the cell to revert to a normal state, as long as the oxygen machinery (i.e. mitochondria) is intact. Conversely, once the mitochondria are deranged, energy failure occurs even in the presence of normoxia. The lactate increase in critically ill patients may therefore be viewed as an early marker of a potentially reversible state.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
L-(+)-Lactic acid solution, in H2O, ≥85%
Sigma-Aldrich
L-(+)-Lactic acid solution, ~40% in H2O
Sigma-Aldrich
L-(+)-Lactic acid solution, 30% in H2O (by weight)
Sigma-Aldrich
L-(+)-Lactic acid solution, meets analytical specification of Ph. Eur., BP, 88-92% total acid basis
Sigma-Aldrich
L-(+)-Lactic acid, BioXtra, ≥98% (titration)
Sigma-Aldrich
L-(+)-Lactic acid, ≥98%
Sigma-Aldrich
L-(+)-Lactic acid, 80%
Supelco
L-(+)-Lactic acid, analytical standard