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[Dynamics of hemodynamic parameters in the early neonatal period]
1Detská klinika Jeseniovej lekárskej fakulty UK, Slovakia.
Background:
The fetal circulation is subdued to alteration after birth. Fetal vascular communications enclose (ductus arteriosus Botalli and foramen ovale) and vascular resistance of the lungs and pressure in the pulmonary artery decrease. Low-resistance placenta is excluded from the systemic circuit, leading thus to abrupt pressure elevation and to its further increase.
Objectives:
The aim of the study is to judge the dynamics of alterations during the postnatal period by means of Doppler's echocardiography:--the left ventricular ventricle,--parameters characterizing circulation in the pulmonary bed.
Methods:
23 healthy randomly selected newborn infants born at full term were examined on the 1st and 2nd day of their life.
Results:
Parameters of the left ventricular function did not change between the 1st and 2nd days of life. Parameters from the outflow tract of the right ventricle on the 5th day of life of infants: the ratio of PEP (preejection period) to AT (acceleration time) significantly decreased, the ratio of PEP to ET(ejection time) did not change. Parameters of the pulmonary artery on the 5th day of life of infants: significant decrease of the ratio PEP/AT, as well as of PEP/ET, the peak and mean velocity of blood flow significantly increased.
Conclusions:
The left ventricular function is not subdued to alterations during early postnatal period. The parameters characterizing the pulmonary circulation prove a decrease of pressure in the pulmonary bed on the 5th day of life. MEANING FOR PRACTICE AND THEORY: The results are utilizable in interpretation of echocardiographic examination in postnatal age. (Fig. 8, Ref. 19.).