Language: Spanish
References: 58
Page: 166-177
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ABSTRACT
Introduction: septic shock is a state of imbalance between oxygen supply and demand in the organism, dysregulation increases progressive cellular damage that ends in multiple organ failure; knowing and using preventive maneuvers allows avoiding further damage. Oxygen transport presents both the oxygen delivery component (DO
2) and the rate of oxygen consumption (VO
2). Low oxygen availability is called dysoxia, and its clinical expression is the presence of multiorgan dysfunction. It may be due to inadequate oxygen supply or a defect in oxygen utilization in the mitochondria, which is called cytopathic hypoxia. VO
2max (maximal oxygen uptake) is the ability to carry and consume oxygen during a stress event and can be a useful tool for early detection of patients with more severe disease.
Objective: to determine the maximum oxygen consumption (VO
2) in patients with septic shock criteria hospitalized in the intensive care unit (ICU) as a predictor of mortality.
Material and methods: single-center, descriptive prospective cohort analysis study, patients with diagnosis of septic shock were included which were admitted to ICU during December 2021-June 2022, mortality risk variables were studied, reason for ICU discharge, sequential organ failure assessment scale (SOFA), assessment scale for severe and chronic diseases (APACHE), VO
2max by Niels Uth formula VO
2max = 15 × (maximum heart rate for age/basal heart rate). Sample size was calculated with expected proportion formula with a sample of n = 80. At admission, heart rate was identified to calculate VO
2max based on the formula VO
2max = 15 × (maximum heart rate for age/basal heart rate), then SOFA and APACHE II mortality scales were calculated, and subsequently follow-up assessment was performed 12 hours after diagnosis of septic shock, calculating VO
2max, and outcome was followed up at discharge.
Results: a complete analysis was performed using the SPSS 22.0.0.0 statistical package. It was divided into two groups for analysis. One group consisted of patients who survived and were discharged due to improvement and the other consisted of patients who died. The analysis of VO
2max at 12 hours was divided into two risk groups using 19 mL/kg/min as the cohort point. A significant statistical difference was found with a p of 0.001. Of the patients in the low-risk group, 44 (100% of the patients in this group) were discharged due to improvement, and of the patients in the high-risk group at 12 hours, 2.3% were discharged due to improvement and 42 patients were discharged due to death (97.7% of the patients in the high-risk group). With a 47% risk difference in risk of death by maintaining a VO
2max below 19 mL/kg/min at 12 hours and a VO
2max above 19 mL/kg/h has a 51% risk difference for patient survival, with a sensitivity of 100% and a specificity of 76% with an RR of 0.74 with a p of 0.001.
Conclusion: VO
2max could be a useful tool to identify patients with adequate resuscitation. This study suggests that an increase in VO
2max at 12 hours above 19 mL/kg/min represents adequate resuscitation with a decrease in mortality of the patient with septic shock.
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