Introduction: knowledge retention at medium and long term in cardiac-pulmonary resuscitation is a problem in education systems worldwide. Objective: to determine the level of knowledge retention about basic cardiac-pulmonary resuscitation in medical students. Method: prospective longitudinal research; developed at the University of Medical Sciences Cienfuegos. https://www.revivedfurnitureandhomedecores.shop/product-category/xmas-wall-art/