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Psychological inflexibility refers to the attempt to decrease internal distress even when doing so is inconsistent with life values, and has been identified as a potential barrier to making and maintaining health behavior changes that are consistent with a heart-healthy lifestyle. Disease- and behavior-specific measures of psychological inflexibility have been developed and utilized in treatment research. However, no specific measure has been created for patients with heart disease. Thus, the CardioVascular Disease Acceptance and Action Questionnaire was developed. The present study is aimed to evaluate the psychometric properties of the CardioVascular Disease Acceptance and Action Questionnaire and to explore its association with measures of psychological adjustment and cardiovascular risk factors in an Italian sample of 275 cardiac patients. Exploratory factor analysis showed a structural one-factor solution with satisfactory internal consistency and test-retest reliability. The relation with other measures was in the expected direction with stronger correlations for the theoretically-consistent variables, supporting convergent and divergent validity. CardioVascular Disease Acceptance and Action Questionnaire scores were associated with general psychological inflexibility, anxiety and depression and inversely correlated with psychological well-being. Moreover, the results showed that CardioVascular Disease Acceptance and Action Questionnaire scores are associated with two relevant risk factors for cardiac patients, namely low adherence to medication and being overweight. In sum, results suggest that the CardioVascular Disease Acceptance and Action Questionnaire is a reliable and valid measure of heart disease-specific psychological inflexibility with interesting clinical applications for secondary prevention care.

Objectives The main objective of the study is to investigate the short-term efficacy of Acceptance and Commitment Therapy (ACT) on the simultaneous modification of biological indicators of risk and psychological well-being in patients with coronary heart disease attending cardiac rehabilitation (CR).Design This was a two-arm randomised controlled trial comparing a brief, manualised, ACT-based intervention with usual care (UC).Setting The study was conducted in an outpatient CR unit in Italy. Data collection took place from January 2016 to July 2017.Participants Ninety-two patients were enrolled and randomised, following an unbalanced randomisation ratio of 2:1 to the ACT group (n=59) and the control group (n=33). Eighty-five patients completed the ACT (n=54) and the UC (n=31) interventions and were analysed.Interventions The control group received UC, a 6 weeks multidisciplinary outpatient CR programme, encompassing exercise training, educational counselling and medical examinations. The experimental group, in addition to UC, participated in the Acceptance and Commitment Therapy on HEART disease (ACTonHEART) intervention encompassing three group sessions based on ACT.Outcomes The primary outcomes were Low Density Lipoproteins (LDL)cholesterol, resting systolic blood pressure, body mass index (BMI) and psychological well-being measured by the Psychological General Well-Being Index (PGWBI). Outcome measures were assessed at baseline and at the end of CR.Results Based on linear mixed models, no significant group × time interaction was observed for either the primary outcomes (β, 95% CI: PGWBI =−1.13, –6.40 to –4.14; LDL cholesterol =−2.13, –11.02 to –6.76; systolic blood pressure =−0.50, –10.76 to –9.76; diastolic blood pressure =−2.73, –10.12 to –4.65; BMI =−0.16, –1.83 to –1.51, all p values >0.05) or the secondary outcomes (all p values >0.05). A significant time effect was found for the PGWBI total (beta=4.72; p=0.03).Conclusions Although analyses revealed null findings, the results can inform the design of future ACT-based CR interventions and can help researchers to strike a balance between the idealised implementation of an ACT intervention and the structural limitations of existing CR programmes.Trial registration number NCT01909102.