title: Comparison of the effects of antenatal magnesium sulphate and ritodrine exposure on circulatory adaptation in preterm infants.
abstract: We examined the effects of maternal magnesium sulphate (MgSO4) and ritodrine treatments on the autonomic cardiovascular control in preterm neonates with respiratory distress syndrome during the first 2 days of life. Serial measurements of heart rate (HR), blood pressure (BP) and respirogram were performed during the first 2 days of life in 28 preterm infants below 33 weeks of gestation with antenatal exposure to MgSO4 (n = 13) or ritodrine (n = 15), and in 12 nonexposed preterm controls. Spectral analysis was used for the quantification of HR and BP variability. Although antenatal MgSO4 exposure had no effect on HR or the systolic, diastolic or mean BP, it was associated with significant decreased beat-to-beat changes in BP. In contrast, ritodrine exposure had no consistent effects on the autonomic cardiovascular control during the first 2 days of life. Our data suggest that maternal MgSO4 treatment decreases the neonatal high frequency changes in BP. This early vascular stabilizing effect of antenatal MgSO4 exposure may contribute to a lowered risk of cerebral vascular catastrophes, in the vulnerable areas of the brain, among the preterm infants with respiratory distress syndrome.
authors: Research Centre of Applied and Preventive Cardiovascular Medicine, Department of Paediatrics, University of Turku, Finland.
authors: T H
authors: TH
authors: Rantone
authors: J U
authors: JU
authors: Grönlund
authors: J O
authors: JO
authors: Jalonen
authors: U U
authors: UU
authors: Ekblad
authors: P O
authors: PO
authors: Kääpä
authors: P O
authors: PO
authors: Kero
authors: I A T
authors: IA
authors: Välimäki
mesh_terms: D000222:Adaptation, Physiological / Q000187:drug effects*; D000375:Aging / Q000502:physiology; D001775:Blood Circulation / Q000187:drug effects* / Q000502:physiology; D001794:Blood Pressure / Q000187:drug effects; D005333:Fetus / Q000187:drug effects*; D006339:Heart Rate / Q000187:drug effects; D006439:Hemodynamics / Q000187:drug effects; D006801:Humans; D007231:Infant, Newborn; D007234:Infant, Premature; D008278:Magnesium Sulfate / Q000627:therapeutic use*; D012312:Ritodrine / Q000627:therapeutic use*; D015149:Tocolytic Agents / Q000627:therapeutic use*
chemical_list: D015149:Tocolytic Agents; D008278:Magnesium Sulfate; D012312:Ritodrine