[Digitalic therapy. Historical outline].

The action of medical drugs obtained from many vegetables aroused a great interest of naturalists and physicians in all time. Moreover, it was always required that those persons destined to medical practice have a good knowledge of botany. Among the medicinal plants utilized by ancient peoples of the Anahuac, yoloxochitl or heart flower (Talauma mexicana) is mentioned, which seems to have a digitalis-like action. Research in our century demonstrated a positive inotropic and bradycardic effect of the leavels of Magnolia grandiflora or Talauma mexicana extract. Since the end of the XVIII century, digitalis was employed. It was considered initially as a diuretic and later as a cardiotonic agent. The action of digitalic glycosides upon the cardiac tissues was studied experimentally in Mexico. At the present-time there are positive inotropic agents derived from pyridine, as is the case of Milrinone, which have a beneficial action on the failing human myocardium. However, following the opinion of distinguished pharmacologists, "in the case of heart failure associated to atrial fibrillation, digitalis cannot be substituted".