scholarly journals Optimal efficiency of high-frequency chest wall oscillations and links with resistance and compliance in a model of the lung

2021 ◽  
Vol 33 (12) ◽  
pp. 121909
Author(s):  
Michaël Brunengo ◽  
Barrett R. Mitchell ◽  
Antonello Nicolini ◽  
Bernard Rousselet ◽  
Benjamin Mauroy
Keyword(s):  
Chest Wall ◽  
High Frequency ◽  
Optimal Efficiency

A comparison of high frequency chest wall oscillation and intrapulmonary percussive ventilation for airway clearance in pediatric patients with tracheostomy

2016 ◽  
Vol 129 (2) ◽  
pp. 276-282 ◽  
Author(s):  
Aneela Bidiwala ◽  
Linda Volpe ◽  
Claudia Halaby ◽  
Melissa Fazzari ◽  
Christina Valsamis ◽  
...  
Keyword(s):  
Chest Wall ◽  
High Frequency ◽  
Pediatric Patients ◽  
Airway Clearance ◽  
Wall Oscillation

Influence of Tracheal Obstruction on the Efficacy of Superimposed High-frequency Jet Ventilation and Single-frequency Jet Ventilation

2015 ◽  
Vol 123 (4) ◽  
pp. 799-809 ◽  
Author(s):  
Robert Sütterlin ◽  
Antonella LoMauro ◽  
Stefano Gandolfi ◽  
Rita Priori ◽  
Andrea Aliverti ◽  
...  
Keyword(s):  
Gas Exchange ◽  
Chest Wall ◽  
High Frequency ◽  
Blood Gases ◽  
Single Frequency ◽  
Jet Ventilation ◽  
Lung Volumes ◽  
High Frequency Jet Ventilation ◽  
Tracheal Obstruction

Abstract Background: Both superimposed high-frequency jet ventilation (SHFJV) and single-frequency (high-frequency) jet ventilation (HFJV) have been used with success for airway surgery, but SHFJV has been found to provide higher lung volumes and better gas exchange than HFJV in unobstructed airways. The authors systematically compared the ventilation efficacy of SHFJV and HFJV at different ventilation frequencies in a model of tracheal obstruction and describe the frequency and obstruction dependence of SHFJV efficacy. Methods: Ten anesthetized animals (weight 25 to 31.5 kg) were alternately ventilated with SHFJV and HFJV at a set of different fHF from 50 to 600 min−1. Obstruction was created by insertion of interchangeable stents with ID 2 to 8 mm into the trachea. Chest wall volume was measured using optoelectronic plethysmography, airway pressures were recorded, and blood gases were analyzed repeatedly. Results: SHFJV provided greater than 1.6 times higher end-expiratory chest wall volume than HFJV, and tidal volume (VT) was always greater than 200 ml with SHFJV. Increase of fHF from 50 to 600 min−1 during HFJV resulted in a more than 30-fold VT decrease from 112 ml (97 to 130 ml) to negligible values and resulted in severe hypoxia and hypercapnia. During SHFJV, stent ID reduction from 8 to 2 mm increased end-expiratory chest wall volume by up to 3 times from approximately 100 to 300 ml and decreased VT by up to 4.2 times from approximately 470 to 110 ml. Oxygenation and ventilation were acceptable for 4 mm ID or more, but hypercapnia occurred with the 2 mm stent. Conclusion: In this in vivo porcine model of variable severe tracheal stenosis, SHFJV effectively increased lung volumes and maintained gas exchange and may be advantageous in severe airway obstruction.

Peripheral mucociliary clearance with high-frequency chest wall compression

1985 ◽  
Vol 58 (4) ◽  
pp. 1157-1163 ◽  
Author(s):  
D. Gross ◽  
A. Zidulka ◽  
C. O'Brien ◽  
D. Wight ◽  
R. Fraser ◽  
...  
Keyword(s):  
Phase I ◽  
Chest Wall ◽  
High Frequency ◽  
Cuff Pressure ◽  
Region Of Interest ◽  
Peripheral Region ◽  
Phase Iii ◽  
Mucus Clearance ◽  
Spontaneously Breathing ◽  
Tracheal Mucus

We investigated the effects of high-frequency chest wall compression (HFCWC) on peripheral and tracheal mucus clearance in anesthetized spontaneously breathing dogs. HFCWC was achieved by oscillating the pressure in a thoracic cuff with a piston pump. Regional lung retention of a technetium-99m sulfur colloid aerosol was monitored with a gamma camera. A peripheral mucus clearance index (PMCI) was defined for each region of interest. The tracheal mucus clearance rate (TMCR) was determined by bronchoscopic visualization of marker particle transport. Phase I: In seven dogs, 30 min of HFCWC at 13 Hz with peak cuff pressure (Pcuff) 100–120 cmH2O was found to significantly enhance PMCI in regions immediately under the cuff. (delta PMCI = 24.4 +/- 4.6 in the basal peripheral region.) Phase II: Because of subpleural hemorrhage in phase I, the effect of HFCWC on TMCR at various Pcuff levels was studied in five dogs. The enhancement of TMCR by HFCWC reached a plateau level at Pcuff = 50 cmH2O. Phase III: HFCWC at 13 Hz with Pcuff = 50–60 cmH2O was found to significantly enhance PMCI in five dogs without the consequence of hemorrhage. Correlations were found between the enhancement of PMCI and TMCR by HFCWC. These results demonstrate that HFCWC is effective in enhancing both peripheral and central mucus clearance in dogs and safe when moderate pressures are applied.

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