Avicenna

Avicenna summarizes: (1) why every pulse beat consists of four moments; (2) a list of ten types of pulse condition with descriptions of symptoms that permit diagnosis of each; (3) explanation of the causes of these ten types of varieties and sub-varieties to be found in each: long pulse, short pulse in conditions identifiable by the length of the beat, rapid and slow in conditions identifiable by its frequency, even and uneven in conditions identifiable by the symmetry or dissymmetry of the beats. He also discusses regular and irregular pulse behavior and enumerates varieties and names of composite pulse conditions. Encyclopedia Iranica, "Avicenna xi. Persian Works."