Treatment Delay and Clinical Outcomes in Patients with ST-Segment Elevation Myocardial Infarction during the COVID-19 Pandemic.

Pandemic-specific protocols require additional time to prepare medical staff and catheterization laboratories. Thus, we sought to investigate treatment delay and clinical outcomes in COVID-19 positive and negative patients with ST-segment elevation myocardial infarction (STEMI) treated with percutaneous coronary intervention (PCI) during on- and off-hours. All consecutive patients with STEMI treated with PCI between 1 March and 31 December 2020 were enrolled in the analysis. A propensity score match was used to compare COVID-19 positive and negative patients for on- and off-hours. The study group was comprised of 877 paired patients treated during regular hours (every day 7:00 a.m. to 16:59 p.m.) and 418 matched pairs with PCI performed during off-hours (every day 17:00 p.m. to 06:59 a.m.) (ORPKI Polish National Registry). No difference in periprocedural mortality was observed between the two groups (on-hours: COVID-19 negative vs. COVID-19 positive: 17 (1.9%) vs. 11 (1.3%); = 0.3; off-hours: COVID-19 negative vs. COVID-19 positive: 4 (1.0%) vs. 7 (1.7%); = 0.5). Additionally, a similar rate of periprocedural complications was reported. Patients diagnosed with COVID-19 were exposed to longer time from first medical contact to angiography (on-hours: 133.8 (±137.1) vs. 117.1 (±135.8) (min); = 0.001) (off-hours: 148.1 (±201.6) vs. 112.2 (±138.7) (min); = 0.003). However, there was no influence of COVID-19 diagnosis on mortality and the prevalence of other periprocedural complications irrespective of time of intervention.