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Impact of Gas Masks on the Work of Breathing and Breathing Pattern in Subjects With Stable COPD

机译：气体面罩对稳定COPD呼吸呼吸模式工作的影响

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BACKGROUND: The gas mask constitutes the main respiratory protective equipment in a chemical. biological, radiological, or nuclear environment. The aim of the study was to evaluate the impact of the gas mask on respiratory pattern, gas exchange, and indexes of respiratory effort in patients with moderate to severe stable COPD. METHODS: Crossover evaluation with 3 randomized-order, 10-min conditions: at rest and with and without a gas mask using 2 different filtered cartridges, each with a distinct inspiratory resistance (cartridge A = 3.5 cm H2O; cartridge B = 2.2 cm H2O, both at 1 L/s). The study involved 8 subjects with COPD, and breathing patterns, indexes of respiratory effort, and capillary blood gases were evaluated. Comparisons of these parameters were made between the tested conditions. RESULTS: Mean subject age was 69 y, and mean FEV1 = 1.3 L (47% predicted). Short-term utilization of the gas mask was associated with a significant increase in the indexes of effort in comparison to baseline without a mask. The esophageal product-time product significantly increased in comparison with baseline (cartridge A = 281 +/- 65 cm H2O/s/min, cartridge B = 253 +/- 47 cm H2O/s/min, and baseline = 184 +/- 46 cm H2O/s/min, P < .001). There were negligible changes in the breathing pattern and gas exchange. CONCLUSIONS: Indexes of respiratory effort increased slightly in subjects with stable COPD while using a gas mask. This effect was likely related to increased inspiratory resistance when the mask was worn. These data are reassuring for the potential short-duration use of such protection for patients with moderate to severe COPD.
机译：背景：防毒面具构成了化学物质的主要呼吸保护设备。生物学，放射性或核环境。该研究的目的是评估防毒面具对中度至严重稳定COPD患者呼吸模式，气体交换和呼吸努力指标的影响。方法：用3个随机顺序的交叉评估，10分钟的条件：静止和使用2个不同的过滤盒的防毒面具，每个都具有明显的吸气阻力（盒A = 3.5cm H2O;盒B = 2.2cm H2O ，均为1卢比）。该研究涉及8种具有COPD的受试者，并评估呼吸效力指标和毛细血气的呼吸模式。在测试条件下进行了这些参数的比较。结果：平均主题年龄为69 y，平均值为FEV1 = 1.3 L（预测47％）。与没有面膜的基线相比，气体掩模的短期利用与努力指标的显着增加有关。与基线相比，食管产品时间产品显着增加（墨盒A = 281 +/- 65cm H 2 O / S / min，墨盒B = 253 +/- 47cm H2O / s / min，以及基线= 184 +/- 46厘米H2O / s / min，p <.001）。呼吸模式和气体交换的变化可以忽略不计。结论：使用防毒面具时，在稳定的COPD的受试者中呼吸努力指标略有增加。这种效果可能有关，而佩戴面膜时的吸气阻力可能有关。这些数据正在放心，用于对中度至严重COPD的患者进行这种保护的潜在短期使用。

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