Out of hospital sudden cardiac arrest as a prognostic factor for in-hospital mortality in patients admitted with cardiogenic shock

Abstract Funding Acknowledgements None. Background The mortality in cardiogenic shock (CS) is still high despite new comprehensive therapies. Cardiac arrest (CA) frequently complicates CS which can have an unfavourable effect on the course after admission. Purpose The study aimed to analyse the clinical characteristics and prognosis of patients admitted with CS after out-of-hospital cardiac arrest (OHCA) compared to the group without OHCA. Methods The studied group consisted of a total of 80 patients with an average age of 62 ± 13 years (81 % male) admitted to tertiary hospital with CS in the period 2021-2022. The severity of the shock according to the Society for Cardiac Angiography and Interventions (SCAI) SHOCK classification among the whole population was from C to E: 7 (9%), 38 (48%), and 35 (43%), respectively. The cohort was divided into 2 subgroups: the OHCA group consisted of 23 individuals (29%) and the without OHCA (non-OHCA group) consisted of 57 individuals. Results The groups did not differ in terms of demographic parameters and comorbidities. There were no differences in baseline heart rate 95 50;114 vs. 91 77;105 beats per minute and mean artery pressure 75 70;97 vs. 82 70;97 mmHg for OHCA vs. non-OHCA, respectively, all p 0.05. Patients from OHCA group had higher baseline creatinine level 1.65 1.35;1.88 vs. 1.37 1.08; 1.65 mg/dL, p=0.019, white blood cell count 12 9;16 vs. 17 12;23 × 109/L, p=0.015 and lower pH from blood gas analysis 7.0 6.9;7.2 vs. 7.3 7.2;7.4, p0.001). In the OHCA group, 90% of cases of CS were caused by acute coronary syndrome (ACS), while in the group without OHCA, 76% were due to ACS and 20 % due to the progression of chronic heart failure, p=0.032. Mechanical Circulatory Support (MCS) was used in almost every patient (98% non-OHCA vs. 95% OHCA), however, the OHCA group was more often treated with V-A ECMO 14 (64%) vs. 16 (28%) in the non-OHCA, p=0.004. The overall number of in-hospital deaths was 57 (71%). The OHCA group had significantly higher in-hospital mortality 22 (96%) compared to the non-OHCA patients 35 (61%), p=0.002. Conclusion Patients experiencing CS complicated by OHCA have more often ischaemic ethology of shock, have a greater degree of organ damage and a lower pH in blood gas analysis at admission, and have extremely high in-hospital mortality rates when compared with patients facing CS but without prior OHCA, which underscores the urgent need for improved prevention methods, interventions, and public awareness.