Abstract: ［Abstract］ Objective〖HTSS〗〓To investigate the effects of different postural intervention on cardiac electrophysiology and gastrointestinal function in patients with acute myocardial infarction(AMI).
〖HTH〗〖WTHZ〗Methods〖HTSS〗〓One hundred and four patients with acute myocardial infarction who were treated were divided into control group(conventional 30 ° supine position) and study group(ladder semirecumbent position) . The differences of myocardial oxygen consumption, heart rate variability, QT dispersion(QTd) and gastrointestinal reaction were compared between the two groups in the supine position(t0), just to adjust semirecumbent predetermined angle(t1), semirecumbent 1min(t2), semirecumbent 5 min(t3), semirecumbent 10 min(t4).
〖HTH〗〖WTHZ〗Results〖HTSS〗〓The myocardial oxygen consumption in group 2 was significantly increased from t1 to t4, but was decreased more in the study group. The standard diviation of NN intervals(SDNN) and the square root of the mean squared difference of successive of NN intervals from t2 to t4 and the study group were decreased less. The ΔQTd and ΔQTcd of the two groups were decreased gradually from t2 to t4, but the study group had lower ΔQTd and ΔQTcd at t0, so the decrease of the study group was smaller and more stable. There were significant differences in the intergroup, interpoint and intergroup interaction between time points between the two groups(P<0.05). The patients in the study group had less abdominal distension and belching than the control group, and the increase of bowel movements and the number of first defecation in 3 days were more than that in the control group. The first defecation time and defecation were shorter than the control group, the difference was statistically significant(P<0.05). The numbers in study group showed constipation, difficulty in urinating and visual analogue scale(VAS), Hamilton anxiety scale(HAMA) were lower than those of the control group, the difference was statistically significant(P<0.05). 〖HTH〗〖WTHZ〗Conclusion〖HTSS〗〓The use of ladder semirecumbent helps to reduce early AMI myocardial oxygen consumption, reduce the incidence of gastrointestinal discomfort and other complications, so as to facilitate rehabilitation of patients.

Key words: myocardial infarction； cardiac electrophysiology, position nursing, gastrointestinal reactions