中村 百合

Yuri NAKAMURA

鳥取大学医学部産科婦人科学教室

Department of Obstetric and Gynecology, Tottori University School of Medicine

キーワード : fetal mechanocardiogram, ultrasound Doppler, fetal PEP, fetal VET, pregnancy

　Fetal systolic time intervals during pregnancy between 35 and 42 weeks were recorded continuously, by multistyli recorder, noninvasively, using ultrasonic Doppler fetal cardiac valve signals and the trigger of abdominal lead FECG. Such time intervals as isovolumetric contraction time (IVC) and ventricular ejection time (VET), determined by Mc-Ao and Ao-Ac respectively, were directly obtained, but pre-ejection period (PEP), the time between Q-Ao, and Q-Mc were corrected values of those between the trigger and Ao, and between that and Mc. Since abdominal lead fetal ECG was difficult to obtain in the labor, the time intervals were recorded during fetal NST in antepartum period. 1) PEP=58.4±5.1 ms, VET=152.6±8.1 ms, IVC=40.3±5.2 ms, PEP/VET=0.38±0.04, and FHR=143.8±7.2 bpm. 2) FHR, IVC and PEP/VET correlated significantly with PEP. The relations were noted between VET and FHR, as well as Q-Mc and PEP/VET too. 3) The correlation coefficient of VET to FHR was larger than that between PEP and FHR. Constant minute volume will be maintained by the reduction of stroke volume in the case of increased FHR, and in the results, it is estimated that VET is more closely related to FHR than PEP. Since PEP and PEP/VET showed close relation, PEP/VET may express fetal cardiac function as well as PEP itself.