Reversible Systolic Heart Failure in a Patient on Ibrutinib Chemotherapy.

Ibrutinib is an irreversible Bruton tyrosine kinase inhibitor that is approved for the treatment of mantle cell lymphoma, chronic lymphocytic leukemia, small lymphocytic lymphoma, Waldenström macroglobulinemia, marginal zone lymphoma, and mantle cell lymphoma. However, it is associated with significant cardiotoxic effects, with hypertension and atrial fibrillation being the most common. We present the case of a 42-year-old female with a medical history significant for lymphoplasmacytic lymphoma who presented with non-arrhythmic, non-ischemic cardiomyopathy after four months of chemotherapy with ibrutinib. In addition, her left ventricular ejection fraction improved markedly within a few days of stopping ibrutinib. We propose that the use of ibrutinib may be associated with reversible non-ischemic cardiomyopathy even in the absence of cardiac arrhythmias. Therefore, clinicians should be cognizant of the signs and symptoms of cardiomyopathy in patients on ibrutinib chemotherapy.