Pre-hospital first aid for acute myocardial infarction (AMI) is an important way to save patients. However, there are still some disputes about the way of pre-hospital first aid. Therefore, this paper provides a Meta-analysis to evaluate the efficacy and prognosis of different prehospital care for AMI with left heart failure. By searching the published studies in the databases, the literature related to the pre-hospital first aid for patients with AMI and left heart failure was screened out. The quality of the literature was evaluated according to the Newcastle-Ottawa scale (NOS), and the corresponding data were extracted for meta-analysis. Meta-analysis was performed on 7 outcome indicators (clinical effect of patients after treatment, respiratory rate, heart rate, systolic blood pressure (SBP), diastolic blood pressure (DBP), survival status, and incidence of complications). A funnel plot and Egger's test were used to test risk of bias. A total of 16 articles were finally included, comprising a total of 1,465 patients. The literature quality evaluation found that 8 literatures were rated as low risk of bias, and 8 literatures were rated as medium risk of bias. The meta-analysis results showed that the clinical effect of the first aid and then transportation group was better than that of the transportation and then first aid group [risk ratio (RR) =1.35, 95% confidence interval (CI): 1.27 to 1.45, P<0.01]; the respiratory rate decreased [mean difference (MD) =-4.84, 95% CI: -6.50 to -3.18, P<0.01]; the heart rate decreased (MD =-11.34, 95% CI: -12.69 to -9.99, P<0.01); SBP decreased (MD =-6.00, 95% CI: -10.00 to -2.00, P<0.01); the DBP decreased (MD =-3.54, 95% CI: -4.45 to -2.64, P<0.01); the survival status of the patients improved (RR =1.29, 95% CI: 1.18 to 1.41, P<0.01); the incidence of complications was reduced (RR =0.31, 95% CI: 0.20 to 0.48, P<0.01). Pre-hospital first aid and then transportation can significantly improve the clinical treatment effect of patients. However, considering that the literatures included in this paper are non-randomized controlled studies and the overall quality of the included literatures is not high and the number of studies is limited, further exploration is needed.
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