Echocardiographic Assessment of Systolic Time Intervals in Vaginal and Cesarean Delivered Neonates

Echocardiographic assessments of fetal and neonatal systolic time intervals were made to determine differences in circulatory changes in 40 neonates delivered vaginally and 30 delivered by elective cesarean section. Left preejection period (LPEP), left ventricular ejection time (LVET), LPEP/LVET, right preejection period (RPEP), right ventricular ejection time (RVET), RPEP/RVET, and heart rate were determined at various time points from antenatal to 120 hours after delivery. There were no significant changes in left systolic time intervals between the two groups at any various time points. However, RPEP and RPEP/RVET values were significantly higher in the cesarean section group than in those in normal vaginal delivery group within 12 hours after delivery. These results suggest that the transient pulmonary hypertension after delivery is prolonged in babies delivered by elective cesarean section.

[1]  O. Hjalmarson,et al.  Epidemiological Analysis of the Increased Risk of Disturbed Neonatal Respiratory Adaptation after Caesarean Section , 1986, Acta paediatrica Scandinavica.

[2]  B. Carson,et al.  Respiratory Morbidity Benefit of Awaiting Onset of Labor After Elective Cesarean Section , 1985, Obstetrics and gynecology.

[3]  J. S. Rawlings,et al.  Transient tachypnea of the newborn. An analysis of neonatal and obstetric risk factors. , 1984, American journal of diseases of children.

[4]  B. T. Jackson,et al.  Plasma catecholamines during hypoxemia in fetal lamb. , 1982, The American journal of physiology.

[5]  A. Sato,et al.  [Intrauterine growth of live-born Japanese infants between 28 and 42 weeks of gestation]. , 1982, Nihon Sanka Fujinka Gakkai zasshi.

[6]  H. Lagercrantz,et al.  Fetal and Maternal Plasma Catecholamine Levels at Elective Cesarean Section under General or Epidural Anesthesia Versus Vaginal Delivery , 1982, American journal of obstetrics and gynecology.

[7]  R. Bland,et al.  Labor decreases the lung water content of newborn rabbits. , 1979, American journal of obstetrics and gynecology.

[8]  J. Torday,et al.  The effect of epinephrine on tracheal fluid flow and surfactant efflux in fetal sheep. , 1978, The American review of respiratory disease.

[9]  S. Kaplan,et al.  The Echocardiographic Assessment of Pulmonary Artery Pressure and Pulmonary Vascular Resistance , 1975, Circulation.

[10]  T. Hata.  M-mode echocardiographic and electrocardiographic assessments of fetal right and left ventricular systolic time intervals during antenatal and early neonatal periods , 1987 .

[11]  S. Chow,et al.  Increased catecholamine levels in cord venous plasma of distressed fetuses. , 1984, Biological research in pregnancy and perinatology.