ST-Segment Elevation Myocardial Infarction Patients Complicated by Out-of-Hospital Cardiac Arrest May Not Benefit from Emergency Percutaneous Intervention

Background Studies have reported significant reduction in acute myocardial infarction–related hospitalizations during the coronavirus disease 2019 (COVID‐19) pandemic. However, whether these trends are associated with increased incidence of out‐of‐hospital cardiac arrest (OHCA) in this population is unknown. Methods and Results Acute myocardial infarction hospitalizations with OHCA during the COVID‐19 period (February 1–May 14, 2020) from the Myocardial Ischaemia National Audit Project and British Cardiovascular Intervention Society data sets were analyzed. Temporal trends were assessed using Poisson models with equivalent pre–COVID‐19 period (February 1–May 14, 2019) as reference. Acute myocardial infarction hospitalizations during COVID‐19 period were reduced by >50% (n=20 310 versus n=9325). OHCA was more prevalent during the COVID‐19 period compared with the pre–COVID‐19 period (5.6% versus 3.6%), with a 56% increase in the incidence of OHCA (incidence rate ratio, 1.56; 95% CI, 1.39–1.74). Patients experiencing OHCA during COVID‐19 period were likely to be older, likely to be women, likely to be of Asian ethnicity, and more likely to present with ST‐segment–elevation myocardial infarction. The overall rates of invasive coronary angiography (58.4% versus 71.6%; P <0.001) were significantly lower among the OHCA group during COVID‐19 period with increased time to reperfusion (mean, 2.1 versus 1.1 hours; P =0.05) in those with ST‐segment–elevation myocardial infarction. The adjusted in‐hospital mortality probability increased from 27.7% in February 2020 to 35.8% in May 2020 in the COVID‐19 group ( P <.001). Conclusions In this national cohort of hospitalized patients with acute myocardial infarction, we observed a significant increase in incidence of OHCA during COVID‐19 period paralleled with reduced access to guideline‐recommended care and increased in‐hospital mortality.

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Prehospital study of survival outcomes from out-of-hospital cardiac arrest in ST-elevation myocardial infarction in Queensland, Australia (the PRAISE study)

European Heart Journal Acute Cardiovascular Care ◽

10.1177/2048872620907529 ◽

2020 ◽

pp. 204887262090752

Author(s):

Brendan V Schultz ◽

Tan N Doan ◽

Emma Bosley ◽

Brett Rogers ◽

Stephen Rashford

Keyword(s):

Myocardial Infarction ◽

Cardiac Arrest ◽

Odds Ratio ◽

Adjusted Odds Ratio ◽

Univariate Analysis ◽

Survival Outcomes ◽

St Segment Elevation ◽

Segment Elevation Myocardial Infarction ◽

St Segment ◽

Hospital Cardiac Arrest

Aim Patients that experience an out-of-hospital cardiac arrest in the context of a paramedic-identified ST-segment elevation myocardial infarction are a unique cohort. This study identifies the survival outcomes and determinants of survival in these patients. Methods A retrospective analysis was undertaken of all patients, attended between 1 January 2013 and 31 December 2017 by the Queensland Ambulance Service, who had a ST-segment elevation myocardial infarction identified by the attending paramedic prior to deterioration into out-of-hospital cardiac arrest. We described the ‘survived event’ and ‘survived to discharge’ outcomes of patients and performed univariate analysis and multivariate logistic regression to identify factors associated with survival. Results In total, 287 patients were included. Overall, high rates of survival were reported, with 77% of patients surviving the initial out-of-hospital cardiac arrest event and 75% surviving to discharge. Predictors of event survival were the presence of an initial shockable rhythm (adjusted odds ratio 8.60, 95% confidence interval (CI) 4.16–17.76; P < 0.001) and the administration of prehospital medication for subsequent primary percutaneous coronary intervention (adjusted odds ratio 2.54, 95% CI 1.17–5.50; P = 0.020). These factors were also found to be associated with survival to hospital discharge, increasing the odds of survival by 13.74 (95% CI 6.02–31.32; P < 0.001) and 6.96 (95% CI 2.50–19.41; P < 0.001) times, respectively. The administration of prehospital fibrinolytic medication was also associated with survival in a subgroup analysis. Conclusion This subset of out-of-hospital cardiac arrest patients was found to be highly salvageable and responsive to resuscitative measures, having arrested in the presence of paramedics and presented with an identified reversible cause.

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