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Natrox ™  topical oxygen therapy (TOT) ( Inotec AMD Ltd, Cambridgeshire, UK) employs a small battery-powered “oxygen generator” to concentrate atmospheric oxygen and feeds pure, moist, oxygen through a fine, soft tube to a dressing-like “oxygen distribution system”, which is placed over the wound and is held in place by a conventional dressing. The aim was to determine the effectiveness of Natrox ™  for non-healing diabetic foot ulcers (DFU) over a 3-month period.Longitudinal, single-arm, open prospective registry study using 12 weeks of TOT using a 4 week run-in period. 20 patients recruited to OTONAL had chronic DFU greater than 3 months duration or minor amputation sites with less than 50% healing in 4 weeks.There were 13 (65%) males and the mean age was 65.7 (±11.6) years. The mean glycated haemoglobin (HbA1c) was 6.9 (±1.3) mmol mol −1  and mean wound duration before TOT was 114 (±79.1) days. 18/20 (90.0%) patients had concomitant lower limb revascularization angioplasty for chronic limb threatening ischaemia. The mean size of the foot ulcer at baseline was 11.3 ± 14.8 cm 2  and mean transcutaneous oxygen measurement value was 34.1 (±19.6) mm Hg. Wound closure of &gt;75% was observed in 14/20 (70.0%) patients. There was a 91.3% (±14.9%) wound area reduction by 3 months (P = .001) and mean time for 100% closure was 77.6 ± 32.5 days. Mean pain scores reduced from 2.4 (±1.8) at baseline to .5 (±1.0) at 3 months (P = .008). All patients were very satisfied using the ambulatory device. Use of TOT in chronic diabetic foot wounds stimulates a healing state, underpinning the concept that oxygen plays a central role in wound healing. Our results are more compelling if you consider they started with relatively large-sized DFUs and majority of patients were frail with underlying peripheral artery disease. (NCT03863054)

the international journal of lower extremity wounds/international journal of lower extremity wounds

An Observational Clinical Trial Examining the Effect of Topical Oxygen Therapy (Natrox<sup>™</sup>) on the Rates of Healing of Chronic DiAbetic Foot Ulcers (OTONAL Trial)

An Observational Clinical Trial Examining the Effect of Topical Oxygen Therapy (Natrox™) on the Rates of Healing of Chronic DiAbetic Foot Ulcers (OTONAL Trial)

An Observational Clinical Trial Examining the Effect of Topical Oxygen Therapy (Natrox^™) on the Rates of Healing of Chronic DiAbetic Foot Ulcers (OTONAL Trial)