Understanding of seasonal influenza immunisation and its cardiovascular benefits among cardiology patients

Abstract

Abstract Background Seasonal influenza immunisation reduces the risk of cardiovascular events. Patients with established cardiovascular disease (CVD) derive a greater benefit than those without yet up to 50% globally do not take up the immunisation. Purpose To describe the understanding and perceptions of seasonal influenza immuni2ation among patients CVD. Methods A cross sectional, voluntary and anonymous survey was administered to cardiology inpatients and outpatients attending a large health system in Australia during the 2022 influenza season, May 1st 2022 to August 31st 2022. Demographics, educational and employment status and prior immunisation behaviours were collected. Questions on perceptions and beliefs around seasonal influenza immunisation and influenza-related illness were presented with 5-point Likert scale (strongly disagree through to strongly agree). Results A total of 181 surveys were completed; median age was 64 (50.5% <65 years), 65.0% (115/177) of the population were inpatients, 82.2% (143/174) had completed high school or more; 35.0% (63/180) were female and 24.2% (43/178) spoke a language other than English at home. Over one third of respondents did not receive the seasonal influenza immunisation in the prior year (63/181, 34.5%). Only half (97/179, 54.2%) of patients agreed that their heart condition placed them at higher risk of complications and serious illness if they contracted influenza. While 73.3% (132/180) agreed that immunisation would help prevent risk of serious illness, only 26.8% (48/179) agreed that it would help to prevent myocardial infarction. Nearly a quarter of patients (24.0%, 43/179) were concerned about side effects while 1 in 10 (12.8%, 23/179) patients raised cost as a barrier despite being free-of-charge to all patients with CVD in Australia. If asked to receive the seasonal influenza immunisation, 86% (154/179) patients would agree if their cardiologist recommended it. Conclusions Despite guideline recommendations, most cardiology patients are uninformed of the cardiovascular benefits of seasonal influenza immunisation with many unaware they are at higher risk of influenza-related, preventable illness. The vast majority of patients would accept the immunisation if recommended by their cardiologist highlighting their important role in improving uptake among this high-risk group.