Implantable mechanical circulatory support systems, known as left ventricular assist devices (LVADs), provide long-term, life-saving cardiac support to patients with end-stage heart failure (HF). With the current state of the art, the devices used to quantify a patient's medical HF therapeutics and their interactions of the LVAD with the cardiovascular system are not well studied. Therefore, this paper presents the results with a novel method using the LVAD pump as a sensor. The LVAD system used in this study is the Abbott HeartMate 3 (HM3), currently in clinical use. This observational work aims to establish a link between the HM3 pump data collected non-invasively and the hemodynamic data obtained in the intensive care unit (ICU).