Impact of coronary CT angiography on the hospital outcome among patients admitted with AMI undergoing revascularization procedures in theUS

Abstract Background Coronary CT angiography (CCTA) is gaining popularity as a diagnostic modality for risk stratification among patients hospitalized with acute myocardial infarction (AMI). However, its impact on the hospital outcomes among this population of patients remains to be determined. Methods Using national inpatient sample database, admission cases with a diagnosis of AMI who underwent revascularization procedures were identified from 2016-2020. The prevalence of CCTA was determined among the patient population and stratified based on the type of AMI (STEMI vs. NSTEMI) and revascularization procedure (PCI vs. CABG). Hospital outcomes were compared among the study strata. Results A total of 862,064 admission cases for STEMI and 3,586,944 admission cases for NSTEMI were identified out of which 661,958 cases underwent revascularization procedures. The utilization of CCTA was roughly 10 times higher among AMI cases undergoing PCI than those undergoing CABG (0.5% vs. 0.06%, p<0.0001). Prior CCTA increased the odds of receiving PCI by 79.3 times and the odds of undergoing CABG by 2.8 times. Among STEMI patients undergoing PCI, prior CCTA was associated with a lower mortality rate and non-home disposition (13.8% vs. 21.2%, p<0.0001) compared to no CCTA (3% vs. 5.5%, p=0.01). For NSTEMI patients undergoing PCI, CCTA was associated with a lower non-home disposition (16.5% vs. 20.6%, p=0.003) but not a significantly lower mortality rate. CCTA did not demonstrate any statistically significant differences for AMI patients undergoing CABG. On the other hand, CCTA increased the cost of hospitalization by $15,130.7 for STEMI patients undergoing PCI, length of stay (9 days) and hospital cost for STEMI patients undergoing CABG ($302,802), and total hospital cost for NSTEMI patients undergoing PCI by $8,705. Conclusions Using CCTA helps in risk stratifying AMI patients for revascularization procedures, allocating PCI to those admitted with STEMI and CABG to those with NSTEMI. Although CCTA reduces the risk of death and non-home disposition among STEMI patients undergoing PCI, it also increases hospital charges for patients receiving revascularization procedures.