Research urrent guidelines for cardiovascular disease (CVD) prevention advocate the use of absolute risk (AR) assessment to guide the use of preventive medication, rather than treating blood pressure and cholesterol separately. 2-5 Age, sex, smoking, diabetes, systolic blood pressure and cholesterol ratio are used to estimate the risk of a cardiovascular event in the next 5 years. Preventive medication is recommended if AR is higher than 15%, or 10%-15% with other risk factors. 2,3 Reviews suggest that the AR approach may improve the clinical management of CVD without harm to patients. 6,7 Basing treatment decisions on high AR rather than high individual risk factors may prevent overtreatment of patients with isolated risk factors but low to moderate overall risk, and undertreatment of patients with high overall risk. 8,9 However, international 10-13 and Australian 14-18 research suggests that CVD risk management is not consistently based on AR. Possible barriers to general practitioners using AR assessment include lack of time, accessibility, knowledge and trust; conflicting guidelines; difficulty understanding and explaining AR; and focusing on individual risk factors that may not be included in AR models.10-18 According to the "behaviour change wheel" framework, these factors may act as barriers to the use of AR assessment through three determinants of behaviour: opportunity (eg, access), capability (eg, knowledge) and motivation (eg, trust).
19Little is known about how and why GPs do use AR in CVD risk assessment, and the alternative strategies employed when AR is not the focus of assessment. We aimed to investigate GPs' views and experiences of CVD risk assessment to identify factors that influence the extent to which Australian AR assessment guidelines are used.
MethodsWe used purposive sampling to recruit participants, aiming for maximum variation among a set of characteristics known to influence CVD risk management (Box 1). [20][21][22] Invitation letters were posted to all 3743 members of eight Divisions of General Practice in metropolitan New South Wales. Of 55 GPs who returned expression of interest forms, we allocated 25 to this study. GPs signed a consent form before participating in person (two participants) or via telephone (23 participants). They received $100 for their time. Preliminary analysis suggested saturation of key themes related to the range of CVD risk assessment strategies described by GPs, so no further recruitment was conducted.23 Ethics approval was obtained through the Sydney Local Health District Human Research Ethics Committee.A semi-structured interview schedule covering CVD risk assessment and management was developed (Appendix 1; online at mja.com.au), piloted with two GPs, and clarified. Interviews lasted between 22 and 55 minutes, and de-identified audiorecordings were transcribed verbatim. Between October 2011 and May 2012, interviews were conducted by two of us (C B, S M) who have qualifications in public health.We used a framework analysis method 24 and summarised data w...