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Blood pressure responses to care procedures in ventilated preterm infants
Insights
Routine care procedures in preterm infants can cause blood pressure changes. Modified care, including preoxygenation and reduced endotracheal suctioning, lessened blood pressure drops in ventilated newborns.
Area of Science:
- Neonatal physiology
- Pediatric critical care
Background:
- Routine care procedures in neonatal intensive care units (NICUs) can significantly impact hemodynamic stability in vulnerable preterm infants.
- Understanding blood pressure responses to these interventions is crucial for optimizing patient management and preventing complications.
Purpose of the Study:
- To investigate the effects of routine care procedures on mean aortic blood pressure in ventilated preterm infants during the first three days of life.
- To compare the blood pressure responses between infants receiving standard care and those undergoing modified care protocols.
Main Methods:
- Mean aortic blood pressure was monitored daily in 22 ventilated preterm infants over the first 72 hours of life.
- Two groups were studied: standard care (n=11) and modified care (n=11) involving preoxygenation, omission of chest physiotherapy, and reduced endotracheal suctioning.
- A total of 259 blood pressure responses were analyzed.
Main Results:
- Blood pressure responses were generally biphasic, with an initial drop followed by a more sustained rise.
- Baseline and peak blood pressures increased with gestational and postnatal age.
- Modified care procedures significantly reduced the pronounced blood pressure drops observed in infants requiring intensive ventilatory support.
- The blood pressure rise was attenuated in infants receiving pancuronium and phenobarbitone.
- Infants with intraventricular hemorrhage exhibited more pronounced blood pressure drops during care procedures on the first day of life.
Conclusions:
- Routine care procedures induce significant, biphasic blood pressure changes in preterm infants.
- Modified care protocols can mitigate adverse blood pressure drops, enhancing hemodynamic stability.
- Gestational and postnatal age, as well as specific medications and pre-existing conditions like intraventricular hemorrhage, influence these cardiovascular responses.
Abstract:
Responses of mean aortic blood pressure to sequences of routine care procedures in 22 ventilated, preterm infants were studied daily for the first 3 days of life. In the first 11 infants standard care procedures were used, whereas the next 11 infants were preoxygenated by a preceding 10% increase in inspired oxygen concentration; in these infants, chest physiotherapy was entirely omitted while the frequency of endotracheal suctioning was reduced. A total of 259 blood pressure responses were recorded. In general, responses were biphasic, consisting of an initial blood pressure drop followed by a greater blood pressure rise of longer duration. Baseline blood pressure, as well as the minimum and maximum blood pressure during the care procedures, increased with gestational age and with postnatal age. The blood pressure drop was most pronounced in the infants requiring the most intensive ventilatory support and was reduced by modifying the care procedures. The blood pressure rise was the least in the infants receiving pancuronium and phenobarbitone. Eight infants, 4 in each group, had intraventricular haemorrhage; in these infants, the care procedures induced more pronounced blood pressure drops in the first day of life when compared to the infants without haemorrhage.