1. Association between delta anion gap/delta bicarbonate and outcome of surgical patients admitted to intensive care unit
- Author
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Pedro Ferro Lima Menezes, Ricardo Esper Treml, Tulio Caldonazo, Hristo Kirov, Bruno Caldin da Silva, Amanda Maria Ribas Rosa de Oliveira, Cristina Prata Amendola, Fábio Barlem Hohmann, Luiz M. Sá Malbouisson, and João Manoel Silva Jr
- Subjects
Anion gap ,Critical care ,Metabolic acidosis ,Surgery ,Intensive care ,Anesthesiology ,RD78.3-87.3 - Abstract
Abstract Background Patients undergoing high-risk surgeries with acid-based disorders are associated with poor outcomes. The screening of mixed acid-based metabolic disorders by calculating delta anion gap (AG)/delta bicarbonate (Bic) has a clinically relevant role in patients with high AG metabolic acidosis (MA), however its utility in individuals facing high-risk surgical procedures remains unclear. Objective Characterize metabolic acidosis using delta-AG/delta-Bic and its associations in patients undergoing high-risk surgeries with possible outcome-related complications. Design Prospective observational multicentric study. Setting Three tertiary hospitals in Brazil. Patients Patients undergoing high-risk surgeries, aged 18 years or older, requiring postoperative critical care. Main outcome measures Patients undergoing high-risk surgeries monitored during the postoperative phase across three distinct intensive care units (ICUs), with assessment encompassing laboratory analyses upon admission and 24 h thereafter. Patients with MA and with elevated AG within 24 h were separated into 3 subgroups: [G1 – delta-AG/delta-Bic 1.6] MA associated with alkalosis. Primary endpoint was 30-day mortality. The secondary endpoints were cardiovascular, respiratory, renal, neurological, coagulation and infective complications. Results From the 621 surgical patients admitted to ICU, 421 (51.7%) had any type of acidosis. After 24 h, 140 patients remained with MA with elevated AG (G1: 101, G2: 18, and G3: 21). When compared to patients from subgroups 1 and 3, the subgroup with no mixed disorders 2 showed higher 30-day mortality (adjusted HR = 3.72; 95% CI 1.11–12.89, p = 0.001), cardiovascular complications (p = 0.001), ICU mortality (p = 0.03) and sum of all complications during the ICU period (p = 0.021). Conclusion In the postoperative time, patients with metabolic acidosis and no mixed disorders present higher ICU-Mortality and higher cardiovascular postoperative complications when compared with patients with combined hyperchloremia or alkalosis. Delta-AG/delta-Bic can be a useful tool to evaluate major clinical outcomes in this population.
- Published
- 2024
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