Neonatal Respiratory Distress Syndrome

Clinical Definition and Key Features

Respiratory distress in newborns is defined as any signs of breathing difficulties characterized by tachypnea, grunting, nasal flaring, retractions, and cyanosis, representing the infant's physiological attempt to maintain adequate gas exchange and lung volume 1, 2
Grunting represents repetitive sounds during early expiration, reflecting the infant's attempt to generate positive end-expiratory pressure and maintain functional residual capacity 2
Nasal flaring manifests as consistent outward movement of the ala nasi during inspiration, indicating the infant's effort to reduce inspiratory resistance 2
Cyanosis indicates inadequate oxygenation, with hypoxemia objectively defined as low oxygen saturation (adjusted for altitude) 2

Severe respiratory distress requires immediate escalation of care and is characterized by head nodding, tracheal tugging, and pronounced lower chest wall indrawing 2
Severe tachypnea is defined as a high respiratory rate (≥70 breaths/minute in infants 2-11 months or ≥60 breaths/minute in children 12-59 months) 2
Persistent low oxygen saturation despite supplemental oxygen is a sign of severe respiratory distress 2

Infants born at ≤27 weeks gestation have the highest incidence of respiratory distress, with 90-92% requiring surfactant therapy even after antenatal steroid exposure 1
Infants born at <30 weeks gestation have the highest incidence of respiratory distress syndrome due to surfactant deficiency 1

Respiratory distress syndrome due to surfactant deficiency is the predominant cause in preterm infants born at <30 weeks gestation 1
Approximately 80% of children with primary ciliary dyskinesia have a history of neonatal respiratory distress as term newborns, defined as need for supplemental oxygen or positive pressure ventilation for >24 hours without clear explanation 3

Prematurity, particularly in infants <30 weeks gestation, is a key risk factor for respiratory distress 1
Multiple gestation pregnancies increase the risk of respiratory distress 1
Absence of antenatal corticosteroid administration in preterm deliveries increases the risk of respiratory distress 1

Respiratory distress syndrome is the primary precursor to bronchopulmonary dysplasia, a chronic condition that evolves after premature birth 1
Survivors demonstrate persistent airway obstruction and hyperreactivity into childhood, with average lung function approximately 80% of control subjects at 6-15 years of age 1

Delayed recognition of respiratory distress signs, particularly subtle grunting or nasal flaring in the first hours of life, can lead to inadequate treatment 2
Inadequate respiratory rate assessment using brief spot checks rather than counting over a full minute can lead to underdiagnosis of respiratory distress 2
Failure to use pulse oximetry for objective assessment of low oxygen saturation in all infants with suspected respiratory distress can lead to delayed diagnosis and treatment 2