Austin Health

Title
The Impact of Out-of-Hours Presentation on Clinical Outcomes in ST-Elevation Myocardial Infarction.
Publication Date
2020-06
Author(s)
Biswas, Sinjini
Brennan, Angela
Duffy, Stephen J
Andrianopoulos, Nick
Chan, William
Walton, Antony
Noaman, Samer
Shaw, James A
Ajani, Andrew
Clark, David J
Freeman, Melanie
Hiew, Chin
Oqueli, Ernesto
Lefkovits, Jeffrey
Reid, Christopher M
Stub, Dion
Subject
Out-of-hours presentation
Outcomes
Primary percutaneous coronary intervention
ST-elevation myocardial infarction
Type of document
Journal Article
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DOI
10.1016/j.hlc.2019.05.184
Abstract
Systems of care have been established to ensure patients with ST-elevation myocardial infarction (STEMI) get timely access to primary percutaneous coronary intervention (PPCI). In this study, we evaluated whether patients undergoing PPCI both in-hours and out-of-hours experience similar care and clinical outcomes. Of 9,865 patients who underwent PCI for STEMI from 2005 to 2016 and were enrolled in the multi-centre Melbourne Interventional Group registry, patients who had initially presented to a non-PCI capable hospital, received thrombolysis or presented >12hourspost-symptom onset were excluded. Our final study cohort of 4,590 patients were dichotomised by whether PPCI was performed in-hours or out-of-hours, and compared. The primary outcome was 30-day mortality. The in-hours group included 1,865 patients (40.6%) while 2,725 patients (59.4%) had out-of-hours PPCI. Patients presenting out-of-hours had longer median door-to-balloon time (DTBT; 83 [IQR 61-109] vs. 60 [IQR 41-88] mins, p<0.01) and were more likely to receive a drug-eluting stent (p=0.001). Procedural characteristics were otherwise similar although rates of radial access were low overall (18.4%). No differences in in-hospital, 30-day or 12-month mortality were observed between the groups (p=NS). On Cox proportional hazards modelling, out-of-hours presentation was not an independent predictor of 30-day mortality (HR 0.94, 95% CI 0.71-1.22). A landmark analysis of data from 2012 did not change the primary outcome. Despite a slightly longer DTBT, patients undergoing PPCI out-of-hours experienced similar care and clinical outcomes to the in-hours group. Given the majority of patients with STEMI present out-of-hours, these data have implications for STEMI systems of care.
Link
Citation
Heart, Lung & Circulation 2020; 29(6): 814-823
Jornal Title
Heart, Lung & Circulation

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