Study of Cardiopulmonary Exercise Testing in Women Who Have HER2-Positive Breast Cancer With Mild Cardiotoxicity

All enrolled participants will undergo a cardiopulmonary exercise test (CPET). The CPET will be conducted using an electronic motorized treadmill with 12-lead ECG monitoring performed by ACSM-certified exercise physiologists.

Resting assessment of LVEF and GLS will be evaluated through Conventional 2D and Doppler echocardiograms will be performed per protocol using a commercially available ultrasound scanner, according to the American Society of Echocardiography (ASE) recommendations for a comprehensive examination.

As soon as possible following completion of the CPET, subjects will be placed in the supine position and 2D echocardiographic images will be obtained in the apical 4-/ 3-/2-chamber views.