Clinical characteristics of patients with raised BNP referred from primary care to an outpatient heart failure with potential heart failure using NICE guidelines

Abstract Introduction UK NICE guidelines (1) mandate the referral of patients with potential heart failure (signs, symptoms and raised BNP) for specialist opinion including diagnostic echocardiography. We have analysed the demographic and clinical characteristics of 233 consecutive referrals over a nine month period of such patients from primary care to our outpatient cardiology service. Purpose To identify any differences between those who are subsequently identified as having reduced LV systolic function (HFrEF) and those with preserved LV systolic function. We have further explored any potential differences between those with moderately raised (>440 <2000ng/L) and those with grossly raised levels (>2000ng/L) of BNP as NICE guidance proposes a difference in urgency of assessment for these two patient cohorts. Methods All patients had diagnostic echocardiography following the British Society of Echocardiography guidelines (2) and were clinically assessed by a consultant cardiologist and specialist heart failure nurse. Results Of the 233 patients, 64 (27%) were identified as having HFrEF with the remaining 169 having preserved LV systolic function. In patients with HFrEF the majority had grossly raised BNP (62.5%) whereas with preserved LV systolic function the majority had moderately raised BNP (70.5%); Table 1. Within the referred population, demographics and clinical characteristics were broadly similar for patients with HFrEF and those with preserved LV systolic function for age and cardiovascular comorbidities (IHD, diabetes mellitus, hypertension) but were different for gender and heart rhythm. Patients with HFrEF and moderately raised BNP were twice as likely to be in sinus rhythm (75%) than those with grossly raised BNP (37.5%). In patients with moderately raised BNP those with preserved LV systolic function were more likely to be in AF than those with HFrEF (41% v. 25%). No gender difference was seen in patients with preserved LV systolic function whereas patients with HFrEF were twice as likely to be male; Table 2. Conclusions 1. The majority of patients with raised BNP and potential heart failure referred from primary care do not have HFrEF (72.5%) 2. Regardless of their LV systolic function those patients with the highest BNP levels are more likely to be in AF 3. Of patients with a raised BNP and HFrEF twice as many are male whereas no gender difference is seen in those with a raised BNP and preserved LV systolic 4. Whilst the mean age of both groups (preserved and reduced LV systolic function) is the same, in both groups those with grossly raised BNP are on average 5 years older than those with moderately raised BNP.