Abstract
Objective: To measure right and left ventricular function in neonates with congenital diaphragmatic hernia (CDH) and persistent pulmonary hypertension of the newborn (PPHN) before and after surgical repair.
Methods: Ten newborns with CDH and PPHN before and after surgical repair and 24 normal newborns underwent Doppler echocardiographic measurements of the systolic time intervals (STI) and the index of myocardial performance (IMP) or Tei Index to assess pulmonary hypertension and ventricular function, respectively.
Results: In newborns with CDH and PPHN before surgical repair, STI pre-ejection time/ejection time ratio and pre-ejection time/acceleration time ratio (0.39 ± 0.19 and 1.22 ± 0.6) were significantly prolonged when compared to newborns with CDH and PPHN after surgical repair (0.21 ± 0.05 and 0.80 ± 0.2) and normal newborns (0.20 ± 0.04 and 0.59 ± 0.2), respectively (all p < 0.001). Left IMP and right IMP were also significantly prolonged in newborns with CDH and PPHN before surgery (0.38 ± 0.16 and 0.53 ± 0.25) when compared to newborns with CDH and PPHN after surgery (0.30 ± 0.07 and 0.28 ± 0.13) and normal newborns (0.26 ± 0.09 and 0.20 ± 0.10), respectively (p < 0.05, left IMP) and (p < 0.001, right IMP).
Conclusions: Significant pulmonary hypertension and abnormal left and right ventricular function were found in newborns with CDH and PPHN before surgical repair when compared to the newborns with CDH and PPHN after surgical repair and normal newborns. The STI and the IMP or Tei index can accurately estimate the consequences of pulmonary hypertension and left and right ventricular function in neonates with CDH and PPHN, which may affect management in these critically ill neonates.
- Congenital diaphragmatic hernia
- persistent pulmonary hypertension
- neonate
- ventricular function
- systolic time intervals
- index of myocardial performance
Footnotes
Richard Chambers performed this work at Ochsner prior to his employment at Pfizer Global Research and Development, 235 E. 42nd Street, New York, NY 10017.
- Ochsner Clinic and Alton Ochsner Medical Foundation