Improvement of arterial oxygenation using the double trunk mask above low flow nasal cannula: a pilot study

Systems on Top of Nasal Cannula Improve Oxygen Delivery in Patients with COVID-19: a Randomized Controlled Trial

“…Our findings collected with the double-trunk mask are supported by other trials using the same mask or variant masks with tubes inserted on each side. 17,[20][21][22] More recently, we have shown that the double-trunk mask was able to preserve a target oxygenation level while reducing the oxygen output by more than 50% of the output required by conventional oxygen delivery systems. 7 The oxygen-boosting effect of the doubletrunk mask is likely explained by its storing capacity.…”

“…15 Because of the above-mentioned concerns, there is an imperative need to improve the performance of patients' oxygen delivery with easy-to-perform procedures with the objective of reducing oxygen consumption. For instance, studies showed that the double-trunk mask, an aerosol mask in which two tubes have been fixed in each of the side holes, had the potential to improve the performance of the nasal cannula [16][17][18] (Figure E1 and online data supplement). More recently, Montiel et al have observed that the placement of a surgical facemask in patients already treated with a high-flow nasal cannula improved their oxygenation without relevant side effects.…”

A Modified Aerosol Mask Could Significantly Save Oxygen Supplies during SARS COV 2 Pandemic

“…This set up may have the advantage of increasing the fraction of inspired oxygen for a given oxygen flow delivered by NC, without clinically significant arterial CO 2 increase. 5 Hence, for this fraction of inspired oxygen, the addition of the MAM allows lower oxygen flows and thereby saves oxygen supplies. The MAM can spare up to 50% of oxygen flow while preserving a target arterial oxygen pressure.…”

Impact of an Improvised System on Preserving Oxygen Supplies in Patients With COVID-19

“…Eleven subjects were needed to detect a mean difference of 2 L/min 11 (SD, 1.8 L/min) in oxygen output (α-risk, 0.05; power, 90%). Because SpO 2 may inaccurately reflect arterial oxygen saturation (SaO 2 ) and therefore interfere with our design, patients were retrospectively excluded from the analysis if SpO 2 -SaO 2 mismatch exceeded the expected error of 4%.…”

“…Although evaluation of its place relative to the non-rebreathing mask, high-flow oxygen therapy or non-invasive ventilation was not within the scope of this study, we believe the DTM could also be considered when SpO 2 falls below the target value with standard LFOT systems. 7 , 11 Consequently, the need for non-invasive respiratory support, which increases risks of generating aerosols, 6 may possibly be avoided.…”