Selecting a Suitable Portable Oxygen Carrier for Patients with Moderate to Severe Chronic Obstructive Pulmonary Disease: Difference between a Cylinder Cart and Backpack
- *Corresponding Author:
- Terada J
Department of Respirology, Graduate School of Medicine
Chiba University 1-8-1 Inohana Chuou-ku, Chiba 260-8670, Japan
E-mail: [email protected]
Received date: October 3, 2016; Accepted date: October 24, 2016; Published date: November 1, 2016
Citation: Inagaki T, Yahaba M, Terada J, Kawata N, Asano Y, et al. (2016) Selecting a Suitable Portable Oxygen Carrier for Patients with Moderate to Severe Chronic Obstructive Pulmonary Disease: Difference between a Cylinder Cart and Backpack. J Clin Respir Dis Care 2:120. doi:10.4172/2472-1247.1000120
Copyright: © 2016 Inagaki T, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Background: Long-term oxygen therapy, including ambulatory oxygen, has been widely used for patients with COPD having chronic respiratory failure. However, factors important for selecting suitable carriers of ambulatory oxygen, such as a cylinder cart or backpack, remain unclear for patients with moderate-to-severe COPD. Methods: Twelve patients with moderate-to-severe COPD (mean age, 69.6 ± 7.3 years) performed a six-minute walk test (6MWT) with a cylinder cart and backpack in random order. The parameters of 6MWT with each carrier, pulmonary function test results, and a questionnaire about the preference of each carrier after 6MWTs were analyzed. Results: The Δ distance (distance walked with a backpack - that waked with a cylinder cart) positively correlated with FEV1 (r=0.678, P=0.02) and lung diffusing capacity for carbon monoxide (DLCO) (r=0.606, P=0.048). Patients who could walk longer with a backpack were significantly higher in FEV1 (1.3 ± 0.8 vs. 0.8 ± 0.1 L, P=0.040) and DLCO (13.6 ± 2.1 vs. 8.2 ± 3.3 ml/min/mmHg, P=0.02) than those who walked longer with a cylinder cart. Additionally, patients who could walk longer with a backpack showed a lower maximum pulse rate and pulse rate after 6MWT than those who walked longer with a cylinder cart. Further, patients who preferred a backpack were significantly higher in percentage of predicted FVC (%FVC; 94.4 ± 17.2 vs. 65.5 ± 11.6% P=0.02) and lower in residual volume (2.7 ± 0.8 vs. 4.0 ± 0.6 L, P=0.042) than those who preferred a cylinder cart. Conclusions: FEV1, DLCO, and pulse rate during and/or after 6MWT can be important factors in the selection of proper ambulatory oxygen transport carriers for greater exercise capacity in patients with COPD having chronic respiratory failure.