Abstract
42 term neonates with transient tachypnea (TTN) underwent echocardiography and determination of systolic time intervals before the age of 4 hours. Based on initial measurement of right ventricular systolic time intervals (RVSTIs) the patients were divided in two groups: neonates with RVSTI ratios less than or equal to 0.50 (Group I) (n = 35) and neonates with RVSTI ratios greater than 0.50 (Group II) (n = 7). Group II neonates also had significantly more prolonged left ventricular systolic time intervals (LVSTIs) than Group I neonates. Group II neonates developed markedly more severe form of TTN than Group I neonates. Initially prolonged RVSTI was best predictor of the development of severe TTN (relative risk ratio 17.5, p less than 0.001): clinical characteristics and oxygen requirements at the admission had limited predictive value.
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