BACKGROUND Recent advances in treatment have led to long-term survival after myocardial infarction (MI), but subsequent complications such as heart failure have also increased, and, therefore, the relationship between prognosis and self-care needs to be investigated. AIMS This study aimed to confirm the relationship of potential variables affecting self-care of patients after MI and to determine whether self-care predicts left ventricular systolic function. METHODS Using a descriptive study design, a hypothetical model was constructed based on previous studies, and 191 post-MI patients were recruited from three university hospital outpatient clinics in Korea. The modified model was verified by constructing a structural equation model using AMOS version 24.0. The exogenous variables were illness perception, social support, and depression symptoms. The endogenous variables were self-efficacy, self-care compliance, and changes in left ventricular ejection fraction (LVEF). RESULTS The average patient age and disease duration were 66.3 (±11.5) years and 62.1 (±56.6) months, respectively. Self-care compliance was directly influenced by self-efficacy and indirectly affected by social support. Self-care compliance had a direct effect on LVEF changes, which was indirectly associated with illness perception, social support, and self-efficacy. CONCLUSION This study confirmed the direct effect of self-care compliance on changes in LVEF in patients under follow-up after MI. It is necessary to periodically monitor the degree of self-care in outpatients who are undergoing follow-up after MI to prevent a decrease in cardiac function. Counseling and education may be effective forms of social support to improve disease awareness and self-efficacy among patients with low self-care compliance.

中文翻译：

---

心肌梗死后随访患者左心室收缩功能的自我保健及相关因素

背景技术最近的治疗进展已导致心肌梗死（MI）后的长期生存，但随后的并发症如心力衰竭也有所增加，因此需要研究预后与自我保健之间的关系。目的 本研究旨在确认影响 MI 后患者自我护理的潜在变量之间的关系，并确定自我护理是否能预测左心室收缩功能。方法 使用描述性研究设计，在以往研究的基础上构建假设模型，从韩国三所大学医院门诊招募 191 名 MI 后患者。通过使用 AMOS 24.0 版构建结构方程模型来验证修改后的模型。外生变量是疾病感知、社会支持和抑郁症状。内源性变量是自我效能、自我护理依从性和左心室射血分数（LVEF）的变化。结果患者平均年龄和病程分别为66.3（±11.5）岁和62.1（±56.6）个月。自我保健依从性直接受自我效能影响，间接受社会支持影响。自我保健依从性对 LVEF 变化有直接影响，这与疾病感知、社会支持和自我效能感间接相关。结论 本研究证实了自我护理依从性对心肌梗死后随访患者 LVEF 变化的直接影响。对于心梗后正在接受随访的门诊患者，有必要定期监测自我保健的程度，以防止心功能下降。