1. Volume 101, Issue 2, Pages 385-391 (February 1992)
Physiologic Evaluation of Pressure Support Ventilation by Nasal Mask in Patients with Stable COPD 
N. Ambrosino, M.D., S. Nava, M.D., P. Bertone, P.T., C. Fracchia, M.D., C. Rampulla, M.D. 
CHEST 
Volume 101, Issue 2, Pages (February 1992)
DOI: /chest
Copyright © 1992 The American College of Chest Physicians Terms and Conditions

2. FIGURE 1 BIPAP device used to deliver NPSV.
CHEST  , DOI: ( /chest )
Copyright © 1992 The American College of Chest Physicians Terms and Conditions

3. FIGURE 2
Changes in ventilatory pattern (mean [SD]) observed during NPSV delivered by BIPAP device (upper panel) and Bird 6400ST (lower panel). Solid line and open bars represent baseline data. Dashed line and solid bars represent data obtained during ventilation.
CHEST  , DOI: ( /chest )
Copyright © 1992 The American College of Chest Physicians Terms and Conditions

4. FIGURE 3
Polygraphic recordings during spontaneous breathing (baseline) and NPSV by BIPAP device in a representative patient. Top to bottom: Airflow (inspiration downward), airway pressure, integrated surface diaphragmatic electromyography (Edi), and VT from sum signal of RIP (inspiration upward).
CHEST  , DOI: ( /chest )
Copyright © 1992 The American College of Chest Physicians Terms and Conditions

5. FIGURE 4
The effect of NPSV by BIPAP device on the mean amplitudes of diaphragmatic surface EMG is shown for six individual patients. Measurements performed during spontaneous breathing (CTR) and at the 3rd, 10th, and 20th min of NPSV are shown.
CHEST  , DOI: ( /chest )
Copyright © 1992 The American College of Chest Physicians Terms and Conditions