Factors associated with 30-day mortality in patients receiving mechanical circulatory support for cardiogenic shock

Abstract Introduction Mechanical circulatory support (MCS) is often deployed in patients with refractory cardiogenic shock complicating acute myocardial infarction (AMI-CS). Nevertheless, the mortality rate in these patients remains utterly high, around 50%. Purpose The aim of this study was to identify patient characteristics associated with 30-day mortality in patients receiving MCS for AMI-CS. Methods In the Netherlands, all patients undergoing percutaneous coronary intervention (PCI) are prospectively entered in the Netherlands Heart Registration (NHR). Additional data were retrieved for all CS patients between 2017-2021 in 14 Dutch hospitals, including MCS usage. Survivors and non-survivors amongst MCS treated patients were compared to identify patient characteristics associated with 30-day mortality. In addition, multivariate logistic regression analysis on imputed data was performed to quantify these associations in adjustment for confounders. Results MCS was deployed in 516 (23.3%) of all AMI-CS patients. MCS patients had a mean age of 64.2 (± 12.5) years and 74.6% were male. An intra-aortic balloon pump (IABP) was used in 49.0% of the patients. Impella, extracorporeal membrane oxygenation (ECMO) and multiple devices were used in 18.2%, 13.2% and 18.4% respectively. The overall 30-day mortality rate was 55.0%. At baseline, MCS survivors were younger (62.8 vs 65.2, p=0.03), had diabetes less often (18.4 vs. 28.0, p=0.02), and presented with a higher mean arterial pressure (MAP) (77.9 vs. 71.7, p<0.01). An out-of-hospital cardiac arrest (OHCA) preceded in 34.3% of the survivors versus 42.0% of the non-survivors (p=0.09). Survivors also had lower admission levels of lactate (5.0 vs. 7.8, p<0.01), glucose (12.1 vs. 15.2, p<0.01) and creatinine (94 vs. 115, p<0.01). Multivessel disease (MVD) was present less frequently in survivors compared to non-survivors (62.1% vs. 74.2%, p<0.01). In-hospital cardiac arrest (IHCA) occurred less often in survivors both prior to PCI (8.2% vs. 18.0%, p<0.01) and during PCI (22.8% vs. 34.6%, p<0.01). After multivariate logistic regression, higher age (OR 1.04, 95%CI: 1.02-1.05), resuscitation prior to (OR 2.11, 95 %CI: 1.09-4.09) or during PCI (OR 1.58, 95% CI: 1.01-2.47) and the presence of MVD (OR 2.07, 95% CI: 1.32-3.25) were independently associated with 30-day mortality in AMI-CS patients who received MCS. Conclusion In AMI-CS patients who received MCS, older age, the occurrence of an IHCA prior to or during PCI, and the presence of MVD were independently associated with an increased 30-day mortality.Figure 1.Table 1.