Introduction DomNIV in patients with chronic Type 2 respiratory failure results in improved survival. HOT-HMV study produced encouraging results in patients with COPD treated with home oxygen and DomNIV. [Murphy et al, JAMA, 317(21), 2177–2186] DomNIV usage with or without oxygen has been prevalent in our hospital setting over for 10 years.
Objective Our primary aim was to look at the indications for prescription of DomNIV in our local hospital. Our secondary aim was to look at overall unadjusted mortality in this cohort and in particular any relationship with different types of oxygen provision.
Methods We collected data on all patients who have received DomNIV from 2008–2018 with or without oxygen prescription from our local database. Data on mortality was obtained from our Clinical Portal. We used MS Excel and Vassar stats (http://vassarstats.net/) for statistical analysis.
Results 105 patients commenced DomNIV; 60% were female with a mean (SD) age of 61 (13) years. Indications were Obesity hypoventilation (OH), Overlap syndrome, COPD, Neuromuscular disease, Bronchiectasis and others. 40% of patients did not receive oxygen with DomNIV (wO2), 36% received long term oxygen therapy (LTOT), 15% received overnight oxygen (OO2) and the rest received PRN oxygen.
43% of patients (N=45) died during the study period, of these 40% (N=18) died within the first 12 months. 29% died with LTOT versus 17% wO2 and 0% with OO2 in the first 12 months. This was statistically significant between LTOT and OO2 groups: RR 0.71 (95% CI 0.58–0.87), and also between wO2 and OO2 groups: RR 0.83 (95% CI 0.72–0.95).
Majority of patients received DomNIV treatment for OH;
36% (N=38) had received long term oxygen therapy (LTOT) along with DomNIV;
Patients receiving overnight oxygen with DomNIV survived longer compared to those who had it as LTOT or who didn’t have any oxygen at all.
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