1) Irregularity of the pulse 
• (n.) A secondary notch in the pulse curve, obtained in a sphygmographic tracing.
(ә-nak´rә-tiz-әm) a pulse anomaly evidenced by a prominent notch on the ascending limb of the pulse tracing. adj., anacrot´ic., adj.
A·nac'ro·tism noun [ Greek ..., up, again + ... a stroke.] (Physiol.) A secondary notch in the pulse curve, obtained in a sphygmographic tracing. 
Type: Term Pronunciation: ă-nak′rō-tizm Definitions: 1. Peculiarity of the pulse wave. Synonyms: anadicrotism See: anacrotic pulse
Anacrotism is an irregularity of the pulse.