RT Journal Article SR Electronic T1 Rise and fall of the eosinophils in heart failure: a rare but important phenomenon seen with cardiomyopathy JF BMJ Case Reports FD BMJ Publishing Group Ltd SP bcr-2017-221081 DO 10.1136/bcr-2017-221081 VO 2018 A1 Danish Ali A1 David Snead A1 Vijay Anand Dhakshinamurthy A1 Prithwish Banerjee YR 2018 UL http://casereports.bmj.com/content/2018/bcr-2017-221081.abstract AB A 65-year-old lady and a 69-year-old gentleman, both with a background history of adult-onset asthma, presented with clinical features of heart failure (HF). High-sensitivity cardiac troponin T and eosinophils were significantly raised, along with poor left ventricular (LV) systolic function on cardiac imaging. Endocardial and skin biopsy (in cases 1 and 2, respectively) showed eosinophilic infiltration. This in combination with the clinical features confirmed the diagnosis of eosinophilic myocarditis (EM) secondary to eosinophilic granulomatosis with polyangiitis in case 1. Both cases were managed with high-dose intravenous corticosteroids and conventional HF medication. Case 1 successfully responded clinically with improvement in LV systolic function. Case 2 required further immunosuppressive therapy (rituximab) and cardiac resynchronisation therapy, but eventually died of septic shock secondary to immunosuppressives. Our cases highlight the importance of early diagnosis and treatment of EM and ongoing monitoring of patients on immunosuppressive therapy.