Cerebral oxygenation and cerebral oxygen extraction in the preterm infant: the impact of respiratory distress syndrome

Experimental Brain Research
Petra M A LemmersFrank van Bel

Abstract

Haemodynamic factors play an important role in the etiology of cerebral lesions in preterm infants. Respiratory distress syndrome (RDS), a common problem in preterms, is strongly related with low and fluctuating arterial blood pressure. This study investigated the relation between mean arterial blood pressure (MABP), fractional cerebral oxygen saturation (ScO2) and fractional (cerebral) tissue oxygen extraction (FTOE), a measure of oxygen utilisation of the brain, during the first 72 h of life. Thirty-eight infants (gestational age < 32 week) were included, 18 with and 20 without RDS. Arterial oxygen saturation (SaO2), MABP and near infrared spectroscopy-determined ScO2 were continuously measured. FTOE was calculated as a ratio: (SaO2-ScO2)/SaO2. Gestational age and birth weight did not differ between groups, but assisted ventilation and use of inotropic drugs were more common in RDS infants (P<0.01). MABP was lower in RDS patients (P<0.05 from 12 up to 36 h after birth), but increased in both groups over time. ScO2 and FTOE were not different between groups over time, but in RDS infants ScO2 and FTOE had substantial larger variance (P<0.05 at all time points except at 36-48 h for ScO2 and P<0.05 at 12-18, 18-24, 36-48 and 48-6...Continue Reading

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