Question category: Cardiology
A 50 year old female presents with shortness of breath on exertion. She has completed chemotherapy for breast cancer approximately 6 months ago. On examination her apex beat is displacede and there is evidence of a 3rd heart sound and bibasal crackles. A CXR is requested and reveals cardiomegaly and bilateral small pleural effusions, interstitial oedema and upper lobe diversion. What chemotherapy may have lead to the heart failure?