Fludd's Pulsus seu nova et arcana pulsuum historia contain's Fludd's chief medical writings. Dated 1629, but issued in this form, Fludd's Pulsus was the first published endorsement of Harvey's theory of the circulation of the blood. Fludd and Harvey were colleagues and friends. Both were also concerned with the problem of blood flow, but Harvey pursued the problem mostly from a rational, experimental perspective with some attention to the mystical, while Fludd took a primarily mystical approach. When it was time to publish De motu cordis Harvey used Fludd's publisher in Frankfurt, William Fitzer. See Allen Debus, "Harvey and Fludd: The irrational factor in the rational science of the 17th century," J. Hist. Biol., 3 (1970) 81-105. Also, Walter Pagel, William Harvey's biological ideas, 113-115. Digital facsimile from Wellcome Collection.org at this link.

(Thanks to W. Bruce Fye for insight into this work.)