Nocturnal Supplemental Oxygen Therapy

Primary Indications by Disease Category

The American Thoracic Society recommends supplemental oxygen for chronic hypoxemia from pulmonary diseases, nocturnal desaturation in pulmonary arterial hypertension, sleep-disordered breathing with severe hypoxemia when positive airway pressure cannot be tolerated, and chronic lung disease of infancy with nocturnal oxygen desaturation 1, 2, 3
For patients with Chronic Obstructive Pulmonary Disease (COPD), long-term oxygen therapy (LTOT) is indicated when resting PaO2 ≤7.3 kPa (55 mm Hg) or oxygen saturation ≤88%, which provides survival benefit and improves pulmonary hemodynamics 4
The European Respiratory Society suggests LTOT should be prescribed when resting PaO2 is ≤8 kPa (60 mm Hg) with evidence of peripheral edema, polycythemia, or pulmonary hypertension 4
Nocturnal desaturation occurs in 77% of patients with Pulmonary Arterial Hypertension (PAH), primarily related to underlying gas exchange disturbances rather than sleep apnea 1, 6, 7
The American Academy of Pediatrics recommends supplemental oxygen to maintain saturation ≥95% in infants with Chronic Lung Disease of Infancy (CLDI) to promote growth and lung repair, provide adequate exercise tolerance, and diminish pulmonary artery hypertension 2, 8
For patients with sleep-disordered breathing and severe nocturnal hypoxemia, nocturnal oxygen is suggested when positive airway pressure cannot be tolerated or is awaiting surgical treatment 3

Nocturnal hypoxemia triggers hypoxia-induced pulmonary vasoconstriction, worsening preexistent pulmonary hypertension and right ventricular strain 1, 6, 7
Maintaining adequate oxygenation prevents activation of the renin-angiotensin system and reduces salt and water retention 4

Pulse oximetry is the primary method for assessing oxygen levels, with multiple determinations during rest, sleep, feeding, and high activity 2, 11
The American Thoracic Society defines chronic hypoxemia in infants as ≥5% of recording time with SpO2 ≤93% on continuous recording, or at least three separate findings of SpO2 ≤93% on intermittent measurements 3
Overnight pulse oximetry should include at least 8 hours of sleep for reliable prediction of oxygen needs 10

For most adults with chronic lung disease, the target oxygen saturation level is ≥90% during sleep 1, 6, 7
For infants and children with PAH, the target oxygen saturation level is ≥92% during sleep 1, 6, 7
For infants with CLDI/BPD past the age of oxygen-induced retinopathy risk, the target oxygen saturation level is ≥95% 2, 8

COPD patients with moderate resting hypoxemia (SaO2 89-93%) or isolated exercise desaturation without severe resting hypoxemia do not benefit from supplemental oxygen in terms of survival, hospitalizations, or quality of life 5
The American College of Chest Physicians recommends monitoring for adequate treatment, including screening for undertreatment during sleep, poor compliance, congenital cardiac defects, upper airway obstruction, or chronic aspiration with gastroesophageal reflux 2, 8