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Blood Lactate Is a Useful Indicator for the Medical Emergency Team
Lactate has been thoroughly studied and found useful for stratification of patientswith sepsis, in the IntensiveCareUnit, and trauma care. However, little is known about lactate as a risk-stratificationmarker in theMedical Emergency Team- (MET-) call setting.We aimed to determine whether the arterial blood lactate level at the time of a MET-call is associated with increased 30-day mortality. This is an observational study on a prospectively gathered cohort at a regional secondary referral hospital. AllMET-calls during the two-year study period were eligible. Beside blood lactate, age and vital signs were registered at the call. Among the 211 calls included, there were 64 deaths (30.3%). Median lactate concentration at the time of the MET-call was 1.82mmol/L (IQR 1.16-2.7). We found differences between survivors and nonsurvivors for lactate and oxygen saturation, a trend for age, but no significant correlations between mortality and systolic blood pressure, respiratory rate, and heart rate. As compared to normal lactate (<2.44mmol/L), OR for 30-daymortality was 3.54 (p < 0.0006) for lactate 2.44-5.0mmol/L and 4.45 (p < 0.0016) for lactate > 5.0mmol/L. The present results support that immediate measurement of blood lactate inMET call patients is a useful tool in the judgment of illness severity.
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