The Challenges of Identifying Patients With Peripheral Artery Disease Utilizing Administrative Databases

Peripheral artery disease (PAD) carries a high burden of morbidity when identified in patients with coronary artery disease (CAD). How-ever, identification of patients with concomitant CAD and PAD remains challenging. Using linked administrative databases of 207,026 in-dividuals with CAD between 2002 and 2019 (median follow-up, 4.7 years), a model for PAD was applied to identify baseline PAD and the development of PAD during follow-up. Both baseline PAD and future PAD models demonstrated poor calibration and discrimination (c-sta-tistic 0.618 and 0.583). In the absence of additional variables, the present models are unable to identify patients with concomitant CAD and PAD.