Ma'anar ƙamus na "ƙarashin bugun jini" shine adadin lokutan bugun zuciyar mutum a cikin minti daya, wanda yawanci ana auna ta ta hanyar jin bugun bugun jini a wuyan hannu, wuya, ko wani sashe na jiki. Yana da mahimmancin nuni ga lafiyar mutum gaba ɗaya kuma yana iya bambanta dangane da abubuwa kamar shekaru, aikin jiki, da yanayin likita. Adadin bugun bugun jini na yau da kullun ga manya yana tsakanin bugun 60 zuwa 100 a cikin minti daya, amma wannan na iya bambanta dangane da yanayin mutum.