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Vagal response to feeding tube insertion in preterm infants: has the key been found?
E Q Haxhija1, H Rosegger, H F Prechtl
1Department of Obstetrics and Gynecology, University of Graz, Austria.
Insights
Feeding tube insertion in preterm infants can cause significant heart rate and oxygen saturation drops. Slowing the insertion process to at least 15 seconds may help avoid these concerning physiological responses.
Area of Science:
- Neonatal physiology
- Pediatric gastroenterology
Background:
- Feeding tube insertion is a common procedure in neonatal care.
- Understanding the physiological response to this intervention is crucial for infant well-being.
Purpose of the Study:
- To investigate the vagal response to orogastric feeding tube insertion in preterm infants.
- To correlate physiological changes with the duration and quality of tube insertion.
Main Methods:
- Prospective study of 8 healthy preterm infants over the first three weeks of life.
- Continuous monitoring of heart rate, oxygen saturation, respiration, and cerebral blood flow velocities.
- Video recording of feeding tube insertion for behavioral and procedural analysis.
Main Results:
- A significant correlation was found between the duration of tube insertion and heart rate decrease (P = 0.000).
- Maximal oxygen saturation decrease correlated with the degree of heart rate deceleration (P = 0.009).
- Cerebral blood flow velocity alterations occurred when heart rate dropped below 80 beats/min.
Conclusions:
- The duration of feeding tube insertion significantly impacts vagal response in preterm infants.
- Episodes of bradycardia and associated physiological compromise may be preventable.
- A minimum insertion time of 15 seconds is suggested to mitigate adverse events.
Abstract:
We prospectively studied the vagal response to feeding tube insertion in eight healthy preterm infants, on three occasions in each infant during the first three weeks of life. Heart rate, oxygen saturation, respiration and cerebral blood flow velocities were assessed before, during and immediately after insertion of an orogastric feeding tube. The whole procedure was recorded on video. The duration and quality of tube insertion and the behaviour of the infant were evaluated from the recordings. Twenty-one measurements in eight infants were evaluated. The heart-rate decrease observed immediately after tube insertion correlated significantly with the duration of tube insertion, the quicker the manipulation, the greater the heart-rate decrease (P = 0.000). The maximal decrease of oxygen saturation after tube insertion correlated with the degree of heart rate deceleration (P = 0.009). Significant alterations of the flow velocities were observed only when the heart rate fell below 80 beats/min. We speculate that such episodes of bradycardia can be avoided by carefully inserting the feeding tube over a period of at least 15 s.