nocturnal oxygen therapy trial


noc·tur·nal ox·y·gen ther·a·py tri·al

(NOTT) (nok-tŭr'năl ok'si-jĕn thār'ă-pē trī'ăl) Assessment used in patients with advanced stages of COPD that compares the effect of oxygen delivered over a 24-hour period with therapy for shorter periods.