Abstract
Persistent pulmonary hypertension of the newborn is a clinical syndrome associated with a variety of cardiopulmonary diseases. Serial evaluation of pulmonary circulation and cardiac function is important, but available imaging techniques have been limited. A new Doppler index combining systolic and diastolic time intervals (the Tei index, which is a simple and noninvasive measurement) has been reported to be useful for the assessment of global cardiac function in adults and children. The purpose of this study was to test the effectiveness of the Tei index in prospectively assessing ventricular function and pulmonary circulation in a newborn piglet model with hypoxic pulmonary hypertension. One-day-old piglets (1.1–1.6 kg) were intubated and prepared for the experiments under room air and hypoxia. A complete two-dimensional Doppler echocardiographic examination was performed. Common hemodynamic variables were measured continuously throughout the study. The right ventricle (RV) Tei index under hypoxia (fraction of inspired oxygen = 0.10) was significantly higher than the value under air ventilation (medians, 0.38 versus 0.56;p < 0.05). Moreover, there was a significant correlation between RV Tei index and mean pulmonary artery pressure and positive linear correlation between individual changes in RV Tei index and changes in mPAP (r2 = 0.799, p < 0.05). We conclude that the Tei index is useful for assessing the function of the RV and the left ventricle and pulmonary circulation in a newborn piglet model with hypoxic pulmonary hypertension. These results suggest that the Tei index will become an objective method of assessing patients with persistent pulmonary hypertension of the newborn.
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Abbreviations
- PPHN:
-
persistent pulmonary hypertension of the newborn
- RV:
-
right ventricle
- LV:
-
left ventricle
- PAP:
-
pulmonary artery pressure
- HR:
-
heart rate
- mPAP:
-
mean pulmonary artery pressure
- SBP:
-
systemic blood pressure
- mSBP:
-
mean systemic blood pressure
- CVP:
-
central venous pressure
- TR:
-
tricuspid regurgitation
- PDA:
-
patent ductus arteriosus
- PFO:
-
patent foramen ovale
- ROC:
-
receiver-operating characteristic
- RVPEP/RVEP:
-
right ventricular preejection period/right ventricular ejection period
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Sugiura, T., Suzuki, S., Hamed Hussein, M. et al. Usefulness of a New Doppler Index for Assessing Both Ventricular Functions and Pulmonary Circulation in Newborn Piglet With Hypoxic Pulmonary Hypertension. Pediatr Res 53, 927–932 (2003). https://doi.org/10.1203/01.PDR.0000061540.81669.2A
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DOI: https://doi.org/10.1203/01.PDR.0000061540.81669.2A
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