Abstract：ObjectiveTo investigate the clinical characteristics of patients with myocardial infarction with nonobstructive coronary arteries (MINOCA) in different ECG manifestations. MethodsWe selected 361 patients diagnosed with MINOCA from those with acute myocardial infarction undergoing coronary angiography. According to ECG manifestations of STsegment elevation myocardial infarction (STEMI) or non-ST-segment elevation myocardial infarction (NSTEMI), they were divided into STEMI group (n=84) and NSTEMI group (n=277). The general clinical data, laboratory examination results and coronary angiography results of the two groups were retrospectively analyzed. ResultsCompared with the STEMI group, the mean age of disease onset was greater in the NSTEMI group, while the proportion of females, and patients with hypertension and diabetes were all higher; the proportion of cases with smoking history was higher in the STEMI group, all with statistically significant differences (all P<0.05). The white blood cell count, neutrophil count, and platelet count in the STEMI group were all higher than those in the NSTEMI group, and the differences were statistically significant (P<0.05). Platelet distribution width and left ventricular ejection fraction were higher in the NSTEMI group with statistically significant differences (P<0.05). Plaque rupture, coronary spasm and thrombosis accounted for the majority of the disease causes in the STEMI group while the proportion of disease causes of oxygen supply imbalance and unknown etiology were higher in the NSTEMI group with statistically significant differences (P<0.05). ConclusionNSTEMI was the most common ECG change in MINOCA patients. Compared with MINOCA patients with ECG manifestations of STEMI, patients in the NSTEMI group had a greater age of disease onset, and more females are in the group, while these patients had a higher proportion of clinical risk factors, lower inflammatory and platelet indicators, and oxygen supply imbalance and unknown etiology account for higher proportion of disease causes.
