This study focused on the delay of patients, analyzed the epidemiological and clinical characteristics of patients with acute ST segment elevation myocardial infarction from onset to call 120, and discussed the influencing factors of the delay of patients from onset to call 120.

The clinical data of 1238 patients with acute ST segment elevation myocardial infarction treated at Tianjin emergency Center in 2020 were collected and retrospectively analyzed. Patients with chest pain up to 120 minutes were divided into two groups based on the duration from onset to call 120: ≤30 minutes and >30 minutes. Using age, gender, onset time, symptoms at onset, blood pressure at onset, and oxygen saturation as research variables, univariate and multivariate logistic regression analyses were performed to identify the influencing factors of call delay.

The average age onset was (66.5±13.5) years old, 730 cases (59%) were ≤69 years old, 913 (73.7%) were male, and 759 (61.2%) lived in six districts of the city. There were 625 cases (50.5%) with cardio-cerebrovascular disease or peripheral vascular disease, 815 (65.8%) with chest and back pain when calling for help, 507 (40.9%) with disease onset at 21:00~7:00, 375 (30.3%) with disease onset on weekends, 490 (49.8%) with acute inferior myocardial infarction, 595 (48.1%) with first medical contact systolic blood pressure <120 mmHg, 150 (12.1%) with blood oxygen saturation <90%, and 583 (47%) who took more than 30 minutes from prehospital onset to call 120. The results showed that female gender [odds ratio (OR)=1.406; 95% CI: 1.011~1.956; P = 0.043], age >69 years old (OR=1.635; 95% CI: 1.213~2.203; P=0.001), and first medical contact systolic blood pressure ≥120 mmHg (OR=1.501; 95% CI: 1.124~2.004; P=0.006) were risk factors for delay from onset to call 120, while onset time of 7:00~21:00 (OR=0.733; 95% CI: 0.553~0.972; P=0.031) and disturbance of consciousness as the main symptom when calling 120 (OR=0.442; 95% CI: 0.205~0.953; P=0.037) were protective factors for patients to call 120 in time.

Female gender, age >69 years old, onset time at 21:00~7:00, unconsciousness as the main symptom when calling 120, and systolic blood pressure ≥120 mmHg at onset are independent risk factors for delayed call for help in patients with acute ST segment elevation myocardial infarction. It is necessary to pay more attention and strengthen propaganda and education in order to identify acute myocardial infarction as soon as possible, prevent the delay of call for help in time, and reduce death and disability.