Evaluation of a new face mask concept for oxygen administration: a crossover study in healthy volunteers
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Evaluation of a new face mask concept for oxygen administration: a crossover study in healthy volunteers Takashi Kondo1 · Noboru Saeki1 · Sachiko Otsuki2 · Yasuo M. Tsutsumi1 Received: 6 August 2020 / Accepted: 26 September 2020 © Japanese Society of Anesthesiologists 2020
Abstract We developed a new face mask concept for oxygen administration using non-woven textiles. The aim of this study was to evaluate whether the new mask improves acceptability without compromising O 2 delivery and C O2 elimination. 10 healthy adult volunteers were randomized to either the conventional plastic face mask–first group or the new face mask–first group. Participants were asked to wear the assigned mask with O2 at 3 L/min for 10 min while seated. End tidal O2 concentration (et-O2) and end tidal CO2 concentration (et-CO2) were measured via a sampling tube located at the mouth. After a 10-min rest period, the other mask was tested in the same manner. Mask discomfort was evaluated using a 100 mm visual analog scale (VAS) where 0, comfortable and 100, uncomfortable. The results showed that use of the new mask caused less discomfort than the conventional mask (new, 11; conventional, 33) (P = 0.002). Median et-O2 with the new mask was 33%, compared with 30% with the conventional mask (P = 0.008). There were no significant differences in et-CO2 by mask type (new, 32 mmHg; conventional, 30 mmHg). In conclusion, the new mask was more comfortable and provided higher et-O2 than the conventional mask. Keywords Face mask · Oxygen mask · Oxygen delivery system · Airway management · Crossover study Plastic face mask (Hudson mask) is widely used for oxygenation in patients with spontaneous breathing. However, some patients remove the mask due to discomfort [1–3]. Previous studies have shown that conventional masks are less comfortable than other O 2 delivery devices such as nasal cannulas due to feelings of claustrophobia, which can lead to mask removal [4, 5]. Since displacement of the face mask can lead to hypoxemia [6], improving comfort is an important issue. Non-woven textiles are comfortable materials that have long been used for masks worn for long periods; therefore, we developed a new face mask concept for O2 administration using non-woven textiles (an international application No. PCT/JP2015/073276) [7]. In this study, we evaluated whether the new mask improves acceptability without compromising O2 delivery and CO2 elimination. * Takashi Kondo kondo320@hiroshima‑u.ac.jp 1
Department of Anesthesiology and Critical Care, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
Department of Anesthesiology and Critical Care, Hiroshima University Hospital, Hiroshima, Japan
2
The appearance of the new mask is shown in Fig. 1. A pleated polyethylene sheet is placed in front of the nonwoven textile face mask. The O2 delivery tube is inserted and fixed in a layer between the sheet and the mask, where delivered O2 is stored. This space is designed to be an O 2 rese
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