grunting
Audible sound made during expiration as a compensatory mechanism to maintain lung volume and improve oxygenation.
Full Definition
Grunting is an audible expiratory sound produced by neonates as a physiological compensatory mechanism to maintain functional residual capacity and improve gas exchange. The sound results from partial closure of the glottis during expiration, creating positive end-expiratory pressure that helps keep alveoli open and prevents lung collapse. Grunting is often one of the earliest signs of respiratory distress in newborns and may indicate conditions such as pneumonia, respiratory distress syndrome, or other pulmonary pathology. While grunting represents the infant's attempt to self-recruit lung volume, its presence indicates significant respiratory compromise requiring immediate evaluation and potential intervention.
Usage
Usage note: Important early sign of respiratory distress in newborns.
In Context
- "The infant exhibited audible grunting with each expiration." — Physical examination finding
- "Grunting resolved after administration of surfactant therapy." — Treatment response documentation