English to French Medical Medical: Cardiology heart beats

There are two sounds heard during each heart beat. These are called Lub-Dub noises by doctors. When the valves between the upper chambers (atria) and lower chambers (ventricles) close, a "lub" sound is heard. When the valves in the pulmonary and aortic arteries leaving the heart close, a "dub" sound is heard followed by a longer pause.

Existe t-il une traduction en Français, ou s'agit-il d'une onomatopée ? Merci