Ma'anar ƙamus na "ruwan nodal" wani nau'in bugun zuciya ne wanda ya samo asali daga kumburin sinoatrial (SA) ko kumburin zuciya (AV). Ƙwaƙwalwar ƙwanƙwasa ce ta yau da kullun wacce ke da saurin bugun zuciya na 40-60 a cikin minti ɗaya kuma yawanci ana haɗa shi da wasu yanayin zuciya kamar ciwon sinus na rashin lafiya ko toshewar zuciya. Za a iya gano sautin nodal ta hanyar electrocardiogram (ECG) kuma yawanci ana sarrafa shi da magani ko, a lokuta masu tsanani, tare da maganin bugun zuciya.