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myocardial lactate extraction
Measurement of cardiac metabolic function by comparing arterial and coronary sinus lactate concentrations.
Full Definition
Myocardial lactate extraction assesses cardiac metabolism by measuring the difference between arterial lactate concentration and coronary sinus lactate concentration, expressed as a percentage of arterial lactate. Normal hearts extract lactate from arterial blood for energy production, while ischemic or failing hearts may produce lactate, resulting in negative extraction ratios. This measurement provides valuable information about myocardial viability and adequacy of oxygen delivery during cardiac surgery.
Usage
Usage note: Express as percentage and specify sampling technique when reporting extraction ratios.
In Context
- "Myocardial lactate extraction remained positive throughout the cross-clamp period." — Research study
- "Negative myocardial lactate extraction suggested inadequate myocardial protection." — Clinical assessment
Also known as
lactate extraction ratio
myocardial lactate uptake
Contrasted with
lactate production
lactate efflux
Don't confuse with
coronary sinus lactate
arterial lactate