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Pulmonary physiotherapy in neonates: physiologic changes and respiratory management
Insights
Chest physiotherapy involving suctioning and hyperventilation can cause significant hypoxemia (low oxygen) in neonates. This study suggests these interventions are not routinely recommended for infants recovering from respiratory issues.
Area of Science:
- Neonatal Physiology
- Respiratory Medicine
- Pediatric Critical Care
Background:
- Chest physiotherapy is commonly used in neonates with respiratory compromise.
- The physiological effects of specific physiotherapy techniques, such as suctioning and hyperventilation, require careful evaluation.
Purpose of the Study:
- To investigate the impact of chest physiotherapy, including suctioning and hyperventilation, on respiratory function in neonates.
- To assess changes in arterial blood gases, respiratory patterns, lung mechanics, and functional residual capacity.
Main Methods:
- Measurements were taken in 13 neonates (1.25-3.20 kg) during a control period, after chest vibration and suctioning, after hyperventilation, and 2 hours post-suctioning.
- Parameters included arterial blood gases (PO2, PCO2), respiratory rate, lung mechanics (resistance, compliance), tidal volume, and functional residual capacity.
Main Results:
- Mean PO2 significantly decreased after suctioning (to 43 mm Hg) and increased after hyperventilation (to 78 mm Hg).
- Inspiratory resistance significantly decreased post-suctioning, returning to baseline after hyperventilation. Respiratory rate increased significantly after suctioning.
- Functional residual capacity, dynamic lung compliance, tidal volume, PCO2, and base excess showed no significant changes.
Conclusions:
- Suctioning and hyperventilation can lead to significant hypoxemia and altered respiratory mechanics in neonates.
- Routine use of suctioning and hyperventilation in infants recovering from respiratory diseases is not supported due to the risk of severe hypoxemia.
Abstract:
To investigate physiologic alterations in respiratory function associated with chest physiotherapy, arterial blood gases, respiratory patterns, lung mechanics, and functional residual capacity were measured in 13 neonates (weights 1.25 to 3.20 kg) during the control period, after vibration of the chest and suctioning, after hyperventilation, and two hours after suctioning. Compared to control values, mean PO2decreased significantly after suctioning to 43 mm Hg and increased significantly after hyperventilation to 78 mm Hg. There was a significant decrease in inspiratory resistance and a trend toward decrease in expiratory resistance after suctioning, with return to control levels after hyperventilation. Respiratory rate increased significantly after suctioning. Functional residual capacity, dynamic lung compliance, and tidal volume, as well as PCO2 and base excess, were not changed appreciably throughout the protocol. Because of potentially severe hypoxemia, this study suggests that suctioning and hyperventilation are not warranted on a routine basis in infants recovering from respiratory diseases.