• coronary artery disease;
  • depression;
  • metabolic syndrome;
  • quality of life;
  • type 2 diabetes

Aims.  To examine the relationships between depression, coronary artery disease, type 2 diabetes, metabolic syndrome and quality of life in Taiwanese adults from a cardiovascular department of a major hospital in Taiwan.

Background.  Research suggests associations between depression, metabolic syndrome and quality of life. Despite this fact, few studies have investigated these relationships among Taiwanese.

Design.  A cross-sectional descriptive correlational design was used to conduct this study.

Methods.  A convenience sample of 140 adults participated in the study. Data were analysed with descriptive statistics, Pearson’s correlations, hierarchical regression and t-tests.

Results.  Almost a half of the subjects (46·5%) had metabolic syndrome. The most common combination of metabolic syndrome criteria was elevated blood glucose, central obesity and high blood pressure (23·7%). A greater number of individuals had coronary artery disease (72·9%), type 2 diabetes (35%) and/or depression (21·4%). Type 2 diabetes and depression were significant predictors of overall quality of life (β = −0·16, p < 0·01 and β = −0·63, p < 0·001, respectively). In addition, there were significant differences between individuals with and without type 2 diabetes and/or depression regarding overall quality of life scores; t (138) = 3·50, p < 0·01); and t (138) = 7·80, p < 0·001), respectively.

Conclusions.  Coronary artery disease, type 2 diabetes and depression were common among our sample of individuals with metabolic syndrome. Those with diabetes and/or depression had worse quality of life than those without those diseases.

Relevance to clinical practice.  Nurses need to be prepared to assess and intervene in preventing or treating depression among patients with chronic diseases, especially those with coronary artery disease, type 2 diabetes and metabolic syndrome. When individuals are treated for depression, they are more likely to engage in self-management of their diseases, which will prevent complications and improve their quality of life.