Blake Denise F, Crowe Melissa, Lindsay Daniel, Brouff Annie, Mitchell Simon J, Leggat Peter A, Pollock Neal W
Emergency Department, The Townsville Hospital, Townsville, Queensland, Australia.
Marine Biology and Aquaculture, James Cook University, Townsville, Queensland, Australia.
Diving Hyperb Med. 2020 Mar 31;50(1):34-42. doi: 10.28920/dhm50.1.34-42.
Divers with suspected decompression illness require high concentration oxygen (O₂). There are many different O₂ delivery devices, with few data comparing their performance. This study evaluated O₂ delivery, using tissue O₂ partial pressure (PO₂), in healthy divers breathing O₂ via three different delivery devices.
Twelve divers had PO₂ measured at six limb sites. Participants breathed O₂ from: a demand valve using an intraoral mask with a nose clip (NC); a medical O₂ rebreathing system (MORS) with an oronasal mask and with an intraoral mask; and a non-rebreather mask (NRB) at 15 or 10 L·min⁻¹ O₂ flow. In-line inspired O₂ FO₂) and nasopharyngeal FO₂ were measured. Participants provided subjective ratings of device comfort, ease of breathing, and overall ease of use.
PO₂ values and nasopharyngeal FIO₂ were similar with the demand valve with intraoral mask, MORS with both masks and the NRB at 15 L·min⁻¹. PO₂ and nasopharyngeal FO₂ values were significantly lower with the NRB at 10 L·min⁻¹. The NRB was rated as the most comfortable to wear, easiest to breathe with, and overall the easiest to use.
Of the commonly available devices promoted for O₂ delivery to injured divers, similar PtcO₂ and nasopharyngeal FO₂ values were obtained with the three devices tested: MORS with an oronasal or intraoral mask, demand valve with an intraoral mask and NRB at a flow rate of 15 L·min⁻¹. PO₂ and nasopharyngeal FO₂ values were significantly lower when the flow rate using the NRB was decreased to 10 L·min⁻¹.
疑似患有减压病的潜水员需要高浓度氧气（O₂）。有许多不同的氧气输送设备，但比较它们性能的数据很少。本研究通过三种不同的输送设备，对健康潜水员呼吸氧气时的组织氧分压（PO₂）进行评估，以确定氧气输送情况。
12名潜水员在六个肢体部位测量PO₂。参与者通过以下方式呼吸氧气：使用带有鼻夹（NC）的口内面罩的需求阀；带有口鼻面罩和口内面罩的医用氧气再呼吸系统（MORS）；以及在氧气流量为15或10 L·min⁻¹时使用的非再呼吸面罩（NRB）。测量了管路内吸入氧气分数（FIO₂）和鼻咽部FIO₂。参与者对设备舒适度、呼吸 ease和总体易用性进行主观评分。
使用口内面罩的需求阀、两种面罩的MORS以及流量为15 L·min⁻¹的NRB时，PO₂值和鼻咽部FIO₂相似。流量为10 L·min⁻¹时，NRB的PO₂和鼻咽部FIO₂值显著降低。NRB被评为佩戴最舒适、呼吸最轻松且总体最易用的设备。
在推广用于向受伤潜水员输送氧气的常用设备中，测试的三种设备：带有口鼻或口内面罩的MORS、带有口内面罩的需求阀和流量为15 L·min⁻¹的NRB，获得了相似的经皮氧分压（PtcO₂）和鼻咽部FIO₂值。当NRB的流量降至10 L·min⁻¹时，PO₂和鼻咽部FIO₂值显著降低。
