本文用M型超声心动图连续测定生后5天内四组新儿生的右室收缩时间间期(RVSTI),发现:(1) 正常产儿随着时龄增长,RPEP、RICT缩短,RET延长,RPEP/RET、RICT/RET降低;(2) 剖宫产儿与正常产儿有类似趋势,仅RPEP/RET下降略晚于正常产儿;(3) 器械助娩儿组RPEP/RET和RICT/RET的下降较均正常产儿晚;(4) 肺疾患新生儿组两比值下降最晚。表明选择性剖宫产、胎头吸引器及产钳助娩、有肺部疾患的新生儿早期肺循环压力和阻力的下降都受到了影响。 In this study, we measured the right ventricular systolic time (RVSTI) of four newborns within 5 days after birth by M-mode echocardiography and found that: (1) With the increase of age, RPEP and RICT were shortened, RET prolonged, RPEP / RET and RICT / RET decreased; (2) There was a similar trend in cesarean section with that in normal children, but only RPEP / RET decreased slightly later than normal children; (3) Decreased compared with normal late infants; (4) lung disease neonatal group the ratio of the two decline the latest. Show selective cesarean section, fetal head suction forceps and forceps delivery, neonatal lung disease with early pulmonary pressure and resistance to the decline have been affected.