Related Experiment Videos
Ventilatory failure during resistive loaded breathing in the newborn primate
D E Mayock1, T A Standaert, J F Watchko
1Department of Pediatrics, University of Washington School of Medicine, Seattle 98195-6320, USA.
Pediatric Pulmonology
|December 22, 1998
Summary
Newborn monkeys fail to maintain tidal volume against inspiratory resistive loading (IRL), indicating peripheral, not central, respiratory failure. This contrasts with older infants, highlighting developmental differences in respiratory control during critical illness.
Area of Science:
- Neonatal Physiology
- Respiratory Control
- Ventilatory Mechanics
Background:
- Infant primates experience central respiratory failure under inspiratory resistive loading (IRL).
- The response of more immature newborns to IRL remains less understood.
Purpose of the Study:
- To investigate the mechanisms of ventilatory failure in 2-day-old monkeys exposed to IRL.
- To differentiate between central and peripheral respiratory system contributions to failure.
Main Methods:
- Measurements included minute ventilation, blood gases, diaphragmatic EMG activity, and airway pressure in unanesthetized 2-day-old monkeys.
- Animals were subjected to varying levels of IRL until ventilatory failure or sustained normocapnia.
Main Results:
- In successful trials, ventilation and tidal volume were maintained with increased EMG activity and airway pressure.
- During failure, tidal volume decreased despite increased diaphragmatic EMG activity and airway pressure.
- Respiratory frequency remained unchanged, and no diaphragmatic fatigue was detected.
Conclusions:
- Ventilatory failure in 2-day-old monkeys during IRL is attributed to an inability to sustain tidal volume.
- This suggests a peripheral limitation rather than central respiratory center failure in neonates.