"The mechanisms by which closed chest cardiac massage produces and maintains blood flow during cardiopulmonary resuscitation are still debated. To date, two main theories exist: the “cardiac pump”, which assumes that blood flow is driven by direct cardiac compression and the “chest pump”, which hypothesizes that blood flow is caused by changes in intrathoracic pressure."⠀⠀ ⠀⠀ Cipani S, Bartolozzi C, Ballo P, Sarti A. Blood flow maintenance by cardiac massage during cardiopulmonary resuscitation:
