Volume 85, Issue 6, Pages (June 1984)

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Volume 85, Issue 6, Pages 733-738 (June 1984) High-Frequency Jet Ventilation vs Continuous Positive Airway Pressure for Postoperative Respiratory Support D. Benhamou, M.D., J.L. Bourgain, M.D., J.J. Rouby, M.D., P. Viars, M.D. CHEST Volume 85, Issue 6, Pages 733-738 (June 1984) DOI: 10.1378/chest.85.6.733 Copyright © 1984 The American College of Chest Physicians Terms and Conditions

Figure 1 Circuit for HFJV. 1, Oxygen analyzer; 2, ventilator (VS-600), (F = 600/mn; I/E = 0.25; driving pressures of 20, 36, and 44 psig; and Fio2 = 0.6; 3, air-filled catheter for measuring Paw; its distal tip is placed more than 3 cm from distal opening of injector lumen; 4, uncompliant Teflon tube of ventilator connected to proximal opening of injector; and 5, endotracheal tube connection. CHEST 1984 85, 733-738DOI: (10.1378/chest.85.6.733) Copyright © 1984 The American College of Chest Physicians Terms and Conditions

Figure 2 Example of Paw tracing recorded in patient 1 at paper speed of 50 mm/min; a and b represent, respectively, end-expiratory Paw and inspiratory Paw (eye-fitted). Jet pulse swings (10 Hz) are indicated as c. Mean Paw was obtained by electronic damping of signal. CHEST 1984 85, 733-738DOI: (10.1378/chest.85.6.733) Copyright © 1984 The American College of Chest Physicians Terms and Conditions

Figure 3 Stability of transmural filling pressures when mean Paw is increased with either CPAP (C1, C2, and C3) or HFJV (H1, H2, and H3). RAP, Right atrial pressure; PCWP, pulmonary capillary wedge pressure. CHEST 1984 85, 733-738DOI: (10.1378/chest.85.6.733) Copyright © 1984 The American College of Chest Physicians Terms and Conditions

Figure 4 Comparison of venous admixture ( Q . s / Q . t ) expressed as percentage of control value with increasing mean Paw on CPAP (C1, C2, and C3) and on HFJV (H1, H2, and H3). Asterisk indicates p<0.05 vs control. CHEST 1984 85, 733-738DOI: (10.1378/chest.85.6.733) Copyright © 1984 The American College of Chest Physicians Terms and Conditions

Figure 5 Comparison of PaCO2 expressed as percentage of control value with increasing mean Paw with CPAP (C1, C2, and C3) and with HFJV (H1, H2, and H3). Asterisk indicates p<0.05 vs control; and dot indicates p<0.05 comparing C and H at same level of mean Paw. CHEST 1984 85, 733-738DOI: (10.1378/chest.85.6.733) Copyright © 1984 The American College of Chest Physicians Terms and Conditions

Figure 6 Comparison of end-expiratory Paw (EAWP) and inspiratory Paw (IAWP) with increasing mean Paw during CPAP (C1, C2, and C3) and HFJV (H1, H2, and H3). Height of horizontal dashed lines represent Paw amplitude. Double asterisks indicate statistical significance at 5 percent between end-expiratory Paw values at identical mean Paw; diamond indicates statistical significance at 5 percent between inspiratory Paw values at identical mean Paw; and single asterisk indicates statistical significance at 5 percent between Paw amplitudes (end-expiratory vs inspiratory Paw values) at identical mean Paw. CHEST 1984 85, 733-738DOI: (10.1378/chest.85.6.733) Copyright © 1984 The American College of Chest Physicians Terms and Conditions