During the initial setting of BiPAP, most of our patients seemed unable to tolerate an I PAP of more than 10 cm H20. Acclimation and practice seemed also to be important factors during nasal ventilation, frequently mentioned in negative pressure ventilation (NPV).-’ This observation is supported by the study of Strumpf and coworkers in which […]
In this study, we used surface electrodes to record EMGdi. Doubt could be raised that the EMG might be contaminated by the activities of intercostal or abdominal muscles; nevertheless, this kind of contamination can be negligible in both normal subjects and COPD patients. Actually, good correlation between surface and esophageal EMG has been described by […]
The characteristics of 11 patients are demonstrated in Table 1. All were male with an average age of 69 ± 5 years. Average FEV, was 0.71 ± 0.21 L (28 percent ± 9 percent of predicted values). Mild hypoxemia (Pa02, 66 ± 13.7 mm Hg) and minimal hypercapnea (PaC02, 45.1 ± 10.8 mm Hg) were […]
The signals of RC and AB were replayed to form “Lissajous figures” (Fig 1) on software (Lotus version 2). A “phase angle” 0 was calculated as an index of TAA. 0 can be measured from a Lissajous figure, in which AB and RC motion are plotted on the x and у axis, respectively, with time […]
All the experiments were conducted in a well-isolated room. Recording devices were set up as in Figure 1. Oxygen saturation (Sa02) was monitored by a pulse oximeter (Ohmeda Biox 3700, Englewood, Colo). End-tidal CO, (etC02) was monitored continuously via a nasal cannula (during iron lung ventilation) or a small tube attached to the nasal mask […]
Respiratory muscle fatigue may contribute to exercise limitation and respiratory failure in patients with severe chronic obstructive pulmonary disease (COPD). Conventional mechanical ventilation has been successful in supporting ventilation and resting the respiratory muscles when severe respiratory muscle fatigue or failure occurs, but severe complications may ensue from repeated and long-term endotracheal intubation. Noninvasive ventilators […]