Incidence of primary care chest pain consultations during the COVID-19 pandemic: an interrupted time series analysis with routine care data.

Background: The COVID-19 lockdown had profound effects on society and healthcare. Cardiology departments reported declines in chest pain evaluations and acute coronary syndrome (ACS) diagnoses. However, the pattern of chest pain in primary care is not clear yet. This study aims to assess the impact of the COVID-19 lockdown on the number of patients presenting with chest pain in primary care.

Methods: Routine primary care data from the Extramural LUMC (Leiden University Medical Center) Academic Network (ELAN) in the Netherlands were used. Chest pain consultations from January 2017 to December 2020 were included. An interrupted time series analysis was performed to compare the incidence rate (IR) of chest pain consultations during the COVID-19 lockdown to the expected IR. Secondary outcomes were the type of consultations, referral proportions, and the IR of registered ACS diagnoses.

Results: In total 9,908 chest pain consultations were included. During the COVID-19 lockdown the IR was 6.16 per 1000 person-years while the expected IR was 7.55 (95% CI 7.03-8.12). The immediate effect of the lockdown yielded an incidence rate ratio (IRR) of 0.62 (95% CI 0.50-0.77). A similar decrease was seen for ACS diagnoses (IRR 0.62, 95% CI 0.48-0.79), with no compensatory increase after the lockdown (IRR 1.04, 95% CI 0.89-1.21). Face-to-face consultations shifted to telephone consultations (p < 0.001) and hospital referrals decreased (9.9% vs. 19.0% (p < 0.001)).

Conclusions: During the COVID-19 lockdown the number of chest pain consultations and registered ACS diagnoses in primary care decreased significantly. In addition, fewer patients were assessed face-to-face and fewer patients were referred to the hospital.