[Pre-systolic deflexion in pressure recordings of the right ventricle and pulmonary artery (author's transl)].

The authors demonstrated experimentally that the origin of the pre-systolic deflexion, previously observed by many investigators in pressure recordings of the right ventricle and the pulmonary artery, is due to the effective atrial contraction, which, besides the pressure change, produces a blood flow from the ventricle towards the artery. This flow must possibly exert an important role in the maintenance of the cardiac output when a failure of the right ventricle is established.