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Catecholamine response to chest physiotherapy and endotracheal suctioning in preterm infants
Insights
Chest physiotherapy and endotracheal suctioning significantly increase adrenaline and noradrenaline in preterm infants. Phenobarbitone reduced the adrenaline response, while acidosis did not affect catecholamine levels.
Area of Science:
- Neonatal Physiology
- Pediatric Critical Care
Background:
- Neonatal intensive care often involves procedures like chest physiotherapy and endotracheal suctioning.
- These interventions can elicit physiological stress responses in vulnerable preterm infants.
Purpose of the Study:
- To investigate the impact of chest physiotherapy and endotracheal suctioning on catecholamine levels in preterm infants.
- To examine the influence of acidosis and phenobarbitone treatment on these stress responses.
Main Methods:
- Measurement of plasma adrenaline and noradrenaline before and after procedures in 13 ventilated preterm infants.
- Recording of mean aortic blood pressure.
- Analysis using multiple linear regression to assess effects of phenobarbitone and acidosis (blood pH < 7.30).
Main Results:
- Catecholamine levels were five-fold higher in infants with acidosis (pH < 7.30).
- Both adrenaline and noradrenaline significantly increased post-procedure compared to baseline.
- Adrenaline response (two-fold increase) was significantly greater than noradrenaline response.
- Phenobarbitone reduced the adrenaline response but did not affect the noradrenaline response.
Conclusions:
- Chest physiotherapy and endotracheal suctioning induce significant adrenergic stress in preterm neonates.
- Acidosis exacerbates catecholamine release, while phenobarbitone may attenuate the adrenaline response.
- These findings highlight the physiological impact of common neonatal procedures and potential modulatory effects of medication and metabolic state.
Abstract:
Adrenaline and noradrenaline was measured just before and just after chest physiotherapy and endotracheal suctioning in 13 preterm, ventilated, newborn infants. Mean aortic blood pressure was also recorded. Eight of the infants received phenobarbitone. Catecholamine levels were five-fold higher in the 5 infants with blood pH less than 7.30 compared to the other 8 infants. After the procedure, both adrenaline and noradrenaline were significantly higher than baseline levels. The adrenaline response to the procedure was a two-fold increase and significantly greater than the noradrenaline response. Analysis of the effects of phenobarbitone treatment and acidosis on catecholamine responses by multiple linear regression demonstrated that the adrenaline response was reduced by phenobarbitone while the noradrenaline response was unaffected. There were no associations of blood pressure, responses with catecholamine responses, with acidosis or with phenobarbitone treatment.