Differences in Antihypertensive Medication Prescription Profiles Between 2009 and 2021: A Retrospective Cohort Study of CARTaGENE

Abstract

Background: Although blood pressure (BP) control is critical to prevent cardiovascular diseases, hypertension control rates in Canada are in decline. Objective: To assess this issue, we sought to evaluate the differences in antihypertensive medication prescription profiles in the province of Quebec between 2009 and 2021. Design: This is a retrospective cohort study. Setting: We used data from the CARTaGENE population–based cohort linked to administrative health databases. Patients: Participants with any drug claim in the 6 months prior to the end of follow-up were included. Measurements: Guideline-recommended antihypertensive drug prescription profiles were assessed at the time of enrollment (2009-2010) and end of follow-up (March 2021). Methods: Prescriptions practices from the 2 time periods were compared using Pearson’s chi-square tests. A sensitivity analysis was performed by excluding participants in which antihypertensive drugs may not have been prescribed solely to treat hypertension (presence of atrial fibrillation/flutter, ischemic heart disease, heart failure, chronic kidney disease, or migraines documented prior to or during follow-up). Results: Of 8447 participants included in the study, 31.4% and 51.3% filled prescriptions for antihypertensive drugs at the beginning and end of follow-up. In both study periods, guideline-recommended monotherapy was applied in most participants with hypertension (77.9% vs 79.5%, P =.3), whereas optimal 2 and 3-drug combinations were used less frequently (62.0% vs 61.4%, P =.77, 51.9% vs 46.7%, P =.066, respectively). Only the use of long-acting thiazide-like diuretics (9.5% vs 27.7%, P