Association between prehospital septic shock hemodynamic parameters improvement and 28-day mortality

Abstract

Objective: The early hemodynamic optimization of septic shock patients is a cornerstone of care to hope for a better outcome, e.g., mortality decrease. However, in the prehospital setting, hemodynamic evaluation is restricted to micro and macrocirculatory clinical parameters. This study aims to assess the relationship between micro and macrocirculatory hemodynamic parameters improvement and 30-days mortality among septic shock patients being taken care of for by a mobile intensive care unit (mICU) in the prehospital setting. Methods: We performed a retrospective multicenter study, from January 2015 to November 2019 including septic shock patients requiring pre-hospital mICU intervention. Results: Three hundred thirty-seven patients were analyzed. The mean age was 69 ± 15-years-old and 226 of which 67% were male patients. One hundred thirty-six patients (40%) had previous hypertension. Pulmonary infection was the main cause of septic shock (46%) and 30-days mortality reached 30%. After propensity score analysis, for the macrocirculation: when systolic blood pressure increased by at least 30mmHg the odd ratio (OR) for 30-days mortality was 0.77 [0.65-0.84], when diastolic blood pressure increased by at least 5mmHg, the OR for 30-days mortality was 0.95 [0.88-0.99], when mean blood pressure increased by at least 30%, the OR for 30-days mortality was 0.88 [0.77-0.92] and when the heart rate decreased by at least 30 bpm, the OR for 30-days mortality was 0.62 [0.55-0.76]. For microcirculation, when the mottling score decreased by at least 2 points, the OR for 30-days mortality was 0.83 [0.75-0.91]. Conclusion: In this study, we report that prehospital improvement in micro and macrocirculatory parameters are associated with 30-days mortality rate decrease.