Study Cohort
ICD-10-CM/PCS codes were used to search discharges in the 2016 NRD who had a principle diagnosis of AMI (including ST and non-ST elevation AMIs) and a principle procedure of either PR or SR during the index hospitalization; baseline characteristics, comorbidities, in-hospital procedural complications, and endpoints of interest were subsequently extracted. To differentiate post-procedural complications from chronic conditions, the 2016 NRD has a present-on-admission indicator for chronic conditions that present on admission. We also utilized the ICD-10-CM codes used in the Elixhauser comorbidity index to identify comorbid conditions and utilized ICD-10-CM codes that are specific for post-procedural complications, Supplemental Table 1.[17] We excluded patients that did not have AMI as a principle diagnosis and AMIs that were not treated invasively (i.e. PR or SR) or when the revascularization was not the principle procedure. We also excluded AMIs that were treated with a combination of both PR and SR during the same indexed admission. The NRD excludes discharges with missing age, missing or questionable linkage numbers or from hospitals with more than 50% of their discharges excluded because of these criteria, as patients treated in these hospitals may not be reliably tracked over time.[16] All HCUP recommendations and best practices to use the HCUP datasets highlighted by Khera et al were followed.[18]