What is already known on this topic

Depression is a public health threat, particularly due to its bidirectional, adverse associations with common chronic conditions including coronary artery disease (CAD). The American Heart Association recognises depression among the major risk factors for morbidity and mortality following an acute coronary event.1 Depression in older adults is associated with greater risk of potentially preventable medical hospitalisations—such as those for angina—and early rehospitalisation after myocardial infarction.2 Yet, little is known about whether depression treatment could mitigate cardiovascular risk or associated service use.