Cardiorespiratory response to feeding in newborn infants

Area of Science:

• Neonatal Medicine
• Pediatric Respiratory Medicine
• Infant Nutrition

Background:

• Infants with respiratory distress often require nutritional support via nasogastric tubes.
• The impact of feeding volumes on cardiorespiratory stability in these vulnerable infants is critical.

Purpose of the Study:

• To investigate the cardiorespiratory effects of milk feeds in infants with respiratory distress.
• To determine the influence of feeding volume on physiological parameters in neonates.

Main Methods:

• 14 infants with respiratory distress received milk feeds via nasogastric tubes.
• Cardiorespiratory parameters (PaO2, PaCO2, respiratory rate, pH, heart rate, blood pressure) and pressures (portal sinus, central venous) were monitored.
• Feeds of human milk, cow's milk, or distilled water at 5 ml/kg were compared with smaller feeds (2-5 ml/kg).

Main Results:

• Larger feeds (5 ml/kg) caused transient decreases in PaO2, increased respiratory rate, and decreased PaCO2.
• Portal sinus and central venous pressures increased after larger feeds.
• Smaller feeds (2-5 ml/kg) did not produce consistent cardiorespiratory changes.

Conclusions:

• Cardiorespiratory disturbances in infants with respiratory distress appear related to stomach volume displacement from feeding.
• Adverse effects can potentially be mitigated by administering smaller, more frequent feeds to neonates.
• Further research is needed to clarify the relationship between central venous pressure, shunting, and respiratory distress syndrome.