Health-related quality of life in coronary heart disease: a systematic review and meta-analysis mapped against the International Classification of Functioning, Disability and Health.

BACKGROUND: Health-related quality of life (HRQoL) is an important outcome in coronary heart disease (CHD). However, variability in HRQoL indicators suggests a need to consider domain coverage. This review applies a globally accepted framework, the International Classification of Functioning, Disability and Health (ICF), to map HRQoL measures that are reliable and valid among people with CHD.

METHODS: The Embase, Pubmed and PsycInfo databases were searched, with 10 observational studies comparing HRQOL among 4786 adults with CHD to 50949 controls identified. Study reporting quality was examined (QualSyst). Hedges' g statistic (with 95% CIs and p values) was used to measure the effect size for the difference between group means (≤ 0.2 small, ≤ 0.5 medium, ≤ 0.80 large difference), and between-study heterogeneity (tau, I2 test) examined using a random effects model.

RESULTS: Adults with CHD reported lowered HRQoL (gw  = - 0.418, p < 0.001). Adjusted mean differences in HRQoL ratings, controlling for socio-demographics, were smaller but remained significant. Large group differences were associated with individual measures of activity and participation (WHOQOL g = - 1.199, p < 0.001) and self-perceived health (SF 36 g = - 0.616, p < 0.001).

CONCLUSIONS: The ICF provides a framework for evaluating and understanding the impact of CHD on HRQoL. The results demonstrate that HRQoL goes beyond physical symptoms, with activity limitations, social support and participation, and personal perceptions identified as key ICF domains in CHD assessment. Further investigations are needed to unravel the dynamic and inter-relationships between these domains, including longitudinal trends in HRQoL indicators.