Riggs T, Hirschfeld S, Bormuth C, Fanaroff A, Liebman J
Pediatrics. 1977 Mar;59(3):338-44.
Serial echocardiograms were performed in the first three days of life on 38 normal full-term infants. Right ventricular systolic time intervals were measured from the pulmonic valve echogram and left ventricular systolic time intervals were determined from the aortic valve echogram. The heart rate, left ventricular pre-ejection period (LPEP), left ventricular ejection time (LVET), and LPEP/LVET ratio showed insignificant variation with increasing postnatal age. The right ventricular pre-ejection period (RPEP) shortened, the right ventricular ejection time (RVET) lengthened, and the RPEP/RVET ratio decreased with increasing age. The findings suggested that alterations in the RPEP/RVET ratio reflected the decreasing pulmonary artery diastolic pressure and pulmonary vascular resistance of the early neonatal period and may be valuable in the noninvasive evaluation of the newborn's pulmonary vascular bed.
对38名正常足月婴儿在出生后的头三天进行了系列超声心动图检查。从肺动脉瓣超声心动图测量右心室收缩时间间期，从主动脉瓣超声心动图确定左心室收缩时间间期。心率、左心室射血前期（LPEP）、左心室射血时间（LVET）和LPEP/LVET比值随出生后年龄增加变化不显著。右心室射血前期（RPEP）缩短，右心室射血时间（RVET）延长，且RPEP/RVET比值随年龄增加而降低。这些发现提示，RPEP/RVET比值的改变反映了新生儿早期肺动脉舒张压和肺血管阻力的降低，可能对新生儿肺血管床的无创评估有价值。
