Abstract: Objective To explore the relationship between  the Chinese myocardial infarction registration study-ST segment elevation myocardial infarction (CAMI-STEMI), global registry of acute coronary event (GRACE) score, white blood cell/mean platelet volume (WMR) and the short-term prognosis of patients with acute ST-segment elevation myocardial infarction (STEMI) after percutaneous coronary intervention(PCI). 
 Methods Retrospective analysis was performed on clinical data of 92 STEMI patients. Multivariate logistic regression analysis was used to identify the risk factors for short-term poor prognosis after PCI in STEMI patients. 
 Results According to the incidence of major adverse cardiovascular events (MACE) in the hospital after PCI, patients were divided into a good prognosis group (n=60) and a poor prognosis group (n=32). The proportion of ST segment descent, CAMI-STEMI score, GRACE score, and WRM level in patients with poor prognosis were ［14 (43.75%), (6.37±2.15) points, (193.15±20.13) points, and (1 654.21±150.54)］×10-6/L2］, which were significantly higher than those in good prognosis group ［14 (23.33%), (3.14±1.04) points, (139.23±18.57) points, and (1 413.35±118.76)×10-6/L2］, showing significant difference (P＜0.05). The receiver operating curve (ROC) analysis showed that the area under the ROC curve (AUC) of CAMI-STEMI, GRACE score, and WMR in predicting short-term poor prognosis in STEMI patients after PCI were 0.967, 0.959, and 0.912, respectively (P＜0.05). Multivariate Logistic regression analysis showed that ST segment descent, CAMI-STEMI score ≥4.720 points, GRACE score ≥165.605 points, WMR ≥1 555.770×10-6/L2 were risk factors for short-term poor prognosis of STEMI patients after PCI (P＜0.05). 
 Conclusion The short-term poor prognosis of STEMI patients after PCI is affected by ST segment descent, CAMI-STEMI, GRACE score and WMR level, which have high predictive value for the short-term prognosis of STEMI patients. 

Key words: ST elevation myocardial infarction, percutaneous coronary intervention, prognosis