[Fetal mechanocardiogram studied by systolic time intervals in ultrasonic doppler fetal heart valve signals using new multistylus recorder system (author's transl)].
Continuous and on-line recording of ultrasonic Doppler fetal heart valve signals were investigated simultaneously with FHR and uterine contraction during labor in 57 cases using new multistylus recorder system 1) Electromechanical intervals of normal cases were found in FHR-baseline that T-Ao, Mc-Ac, T-Ac and Ao-Ac showed prolongation with FHR decrease when starting point of cardiac cycle was exposed by "T", but T-Mc, Mc-Ao and Ac-Mo had no particular relation to FHR. T-Ao showed large variation, but no relation to gestational age. Ac-Mo was almost constant. Early deceleration showed elongation of T-Ao during FHR decrease in 2 cases but no change in 1. Small variation of Ao-Ac was noted in each FHR range. Mild variable deceleration showed elongated T-Ao, Mc-Ao and T-Mc in 13 cases but unchanged in 1. Ao-Ac had large variation in each FHR range. At the acceleration, 2 cases had T-Ao prolongation but a case no change. Ac-Mo values were almost constant during deceleration and acceleration. 2) In 5 abnormal cases diagnosed by late deceleration, severe variable deceleration or bradycardia, 4 showed continuous shortening of T-Ao. One had prolongation after its shortening. Two cases showed abnormal Ao-Ac values in some FHR range.
D003201:Computers; D005260:Female; D005318:Fetal Heart / Q000502:physiology*; D006339:Heart Rate; D006351:Heart Valves; D006801:Humans; D007702:Kinetocardiography / Q000379:methods; D007743:Labor, Obstetric; D011247:Pregnancy; D012212:Rheology; D013599:Systole; D014463:Ultrasonography