You are a seeker too man!
Despite artificial heart issue (you asked a good question !) remain.
"Science of the Heart" researched by HeartMath Institute maybe just first step of comprehensive study of heart using scientific approach by a large organization from spirituality point of view.
We all can feel feeling such as unconditional love, compassion, sincere caring etc ALL related with our Heart, so from spirituality point of view, or just from our intuitive or direct Knowing , Heart is not just an organ (so is brain ), it is also an spiritual organ used by human to express above mentioned feelings, Heart still have many more mysterious aspect we still unknown today.