title: Insufficient oxygen concentration obtained at domiciliary controls of eighteen concentrators.
abstract: The oxygen concentration (O2%) produced by 12 type A concentrators, with a working time of 28-18,099 h, and 6 type B concentrators, with a working time of 0-3,033 h, was measured over a 12 month period in the user's home, at a flow rate of 2 l.min-1. One hundred and two measurements of O2% (mean 82.9), made at least once monthly by a visiting nurse, showed that type A concentrators were usually delivering less than 92% expected O2. Four concentrators were delivering less than 40% O2 after a working time of only 4,000 h. Sixty two measurements made by the manufacturer confirmed these findings (mean 86.8). The 18 measurements performed by the nurse on the type B concentrators showed expected O2% values (mean 93.1). Our study demonstrates the necessity of regular clinical and technical surveillance, at the user's home, during long-term domiciliary oxygen therapy and the need for the manufacturer to incorporate an alarm system monitoring the O2% into oxygen concentrators.
authors.affiliation: Centre Antituberculeux, Hôpital Cantonal Universitaire, Geneve, Switzerland.
authors.forename: J P
authors.initials: JP
authors.lastname: Bongard
authors.forename: C
authors.initials: C
authors.lastname: Pahud
authors.forename: R
authors.initials: R
authors.lastname: De Haller
mesh_terms: D006699:Home Care Services / Q000592:standards*; D006801:Humans; D010100:Oxygen / Q000032:analysis*; D010102:Oxygen Inhalation Therapy / Q000295:instrumentation / Q000592:standards*; D011446:Prospective Studies
chemical_list: D010100:Oxygen