The heart is a hollow, muscular organ in vertebrates responsible for pumping blood through the blood vessels by repeated, rhythmic contractions, or a similar structure in annelids, mollusks, and arthropods.
I'm new to this board, but not to DS. Ever since May of this year, my heart rate and blood pressure have both been way too high, and the doctors are talking about doing a sinus node ablation. Does anyone know anything about this? Any and all info would be welcome.