Lower pacemaker implantation rates for atrioventricular block during COVID-19

Abstract

Funding AcknowledgementsType of funding sources: None.IntroductionThe first wave of the COVID-19 crisis was associated with a reduction of patients presenting with acute cardiovascular disease. However, there is only limited data showing the trend of pacemaker implantations and their indications.PurposeTo evaluate pacemaker implantations before, during and after the first COVID-19 wave, stratified by indication.MethodsWe analysed the weekly rates of pacemaker implantation at our centre during the first national lockdown for COVID-19 at the between 16 March 2020 and 29 April 2020 (weeks 12-17 / 2020), compared to the implantation rates 6 weeks before (weeks 6-11 / 2020), 6 weeks afterwards (weeks 18-23 / 2020), and the same time frame in 2017-2019. To reduce bias due to postponed planned procedures, we stratified pacemaker implantations into the following groups: total implantations (including box changes), new pacemaker implantations, implantation due to AV block, implantation due to supraventricular conduction disturbances, and other implantations.ResultsThe total number of total weekly implantations was reduced from 10.7 (weeks 6-11 / 2020) to 4.2 (weeks 12-17 / 2020; -60.1%, p = 0.02). We found no significant reduction in the same time frame in 2017-2019 (6.5 vs. 6.1 per week, p = 0.29). We found a similar effect in "new" pacemaker implantations (8.5 vs. 3.2 per week, -62.7%, p = 0.02) and AV block (5.0 vs. 1.5 per week, -70%, p = 0.03). There was no reduction in pacemaker implantation due to sick sinus syndrome (2.5 vs. 0.8 per week, -66.7%, p = 0.12) and other indications (1.0 vs. 0.8 per week, -16.7%, p = 0.86).In the six following weeks (18-23 / 2020), the total numbers (6.0 per week) and indications other than AV block rose to baseline (p > 0.05), but patients with AV block were still less prevalent (1.7 per week, p = 0.04).ConclusionThe reduction of total and new pacemaker implantations during the COVID-19 lockdown was mainly based on a reduced pacemaker implantation rate for AV block. This effect persisted even after the national lockdown. This analysis implies that a significant number of patients with AV block may have avoided medical contact during and after the lockdown and therefore have experienced increased mortality.