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Apnea duration is related to ventilatory oscillation characteristics in newborn infants
Insights
Premature infants exhibit more frequent and intense oscillatory breathing patterns, strongly linked to prolonged apneas. These breathing irregularities are not isolated events but part of a larger underlying pattern in preterm infants.
Area of Science:
- Neonatal physiology
- Respiratory control in infants
Background:
- Short apneas in full-term infants are linked to oscillatory breathing patterns.
- Premature infants experience more frequent and longer apneas.
Purpose of the Study:
- To investigate the relationship between breathing patterns and apneas in premature infants.
- To characterize respiratory patterns in premature infants.
Main Methods:
- Respiration was monitored in 14 premature infants using a face mask and pneumotachograph.
- Tidal volume, breath duration, and ventilation were analyzed using digital band pass filters.
- Breathing patterns were detected and characterized.
Main Results:
- Premature infants showed more frequent and higher amplitude oscillatory breathing patterns than full-term infants.
- 94% of apneas (≥3s) and 100% of longer apneas (≥10s) occurred during the minimum phase of oscillatory breathing.
- Apnea duration correlated with the strength and cycle time of breathing patterns.
Conclusions:
- Apnea in premature infants is intrinsically linked to underlying oscillatory breathing patterns.
- These findings suggest apnea is not an isolated event but a manifestation of a broader respiratory control issue in preterm infants.
Abstract:
The occasional short apneas seen in full-term infants within the first postnatal week are related to the minimum phase of oscillatory breathing patterns. To determine the relationship between breathing patterns and the longer and more frequent apneas seen in premature infants, we monitored respiration in 14 premature infants using a face mask and pneumotachograph. Tidal volume, breath duration, and ventilation were calculated on a breath by breath basis, converted to time-axis data strings, and filtered with a comb of zero phase shift digital band pass filters to detect breathing patterns. Compared with full-term infants, premature infants had breathing patterns that occurred more often and had twice the average amplitude. Of 182 apneas greater than or equal to 3 s long, 94% occurred at the minimum phase of oscillatory breathing patterns. All of the 38 apneas greater than or equal to 10 s long occurred at the minimum phase of oscillatory breathing patterns. Duration of apnea was related to breathing pattern characteristics, e.g., longer apneas were related to stronger, longer cycle-time breathing patterns. Apnea in the premature infant is not an isolated event but is one aspect of an underlying pattern.