Hypereosinophilic syndrome: cardiac diagnosis and management

Hypereosinophilic syndrome (HES) is a heterogeneous group of conditions that is defined at its core by hypereosinophilia (HE) (blood eosinophil count of >1.5×10⁹/L) and organ damage directly attributable to the HE. Cardiac dysfunction occurs frequently in all forms of HES and is a major cause of morbidity and mortality. Once a significantly elevated eosinophil count is identified, it must be confirmed on repeat testing and the...