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Tracheal gas insufflation during pressure-control ventilation: Effect of using a pressure relief valve

Gowski, DT and Delgado, E and Miro, AM and Tasota, FJ and Hoffman, LA and Pinsky, MR (1997) Tracheal gas insufflation during pressure-control ventilation: Effect of using a pressure relief valve. Critical Care Medicine, 25 (1). 145 - 152. ISSN 0090-3493

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Abstract

Objectives: Pressure-control ventilation minimizes alveolar overdistention by limiting peak airway pressure, but a consequence of this pressure limitation may be a reduction in tidal volume with subsequent hypercarbia. Tracheal gas insufflation (TGI) can be used in combination with pressure-control ventilation to augment CO2 elimination. During pressure- control ventilation with continuous TGI, we observed that peak airway pressure increased above the set inspiratory pressure. Based on this observation, we investigated the ability of the pressure-control ventilator circuit to compensate for continuous TGI and the effect of insertion of a pressure relief valve to eliminate over-pressurization. Setting: University research laboratory. Design: Using an artificial lung model, we studied the effects of continuous TGI with varying catheter flows (0, 2, 6, and 10 L/min); ventilator frequencies (10 and 20 breaths/min); inspiratory duty cycles (0.33, 0.50, and 0.67); lung compliance (0.01, 0.02, and 0.04 L/cm H2O); and airway resistance (5, 20, and 50 cm H2O/L/sec) on: a) peak airway pressure; b) total inspiratory tidal volume; c) ventilator-derived tidal volume; and d) intrapulmonary pressure at end-exhalation (auto-PEEP). Tests were performed with and without a pressure relief valve whose threshold 'pop- off' pressure was adjusted to match the set inspiratory pressure (35 cm H2O) for a total of 432 experimental conditions. Measurements and Main Results: Our data demonstrate that pressure-control ventilation augmented with continuous TGI can increase peak airway pressure above set inspiratory pressure due to delivery of a higher than intended tidal volume. Predisposing conditions include catheter flow rates of 6 and 10 L/min, long inspiratory time, low compliance, and low resistance. With the pressure relief valve, peak airway pressure was maintained at the set inspiratory pressure and total inspiratory tidal volume remained constant. Conclusion: A pressure relief valve is a necessary adjunct to maintain peak airway pressure at set inspiratory pressure and keep total inspiratory tidal volume constant when continuous TGI is administered in conjunction with pressure-control ventilation.


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Details

Item Type: Article
Status: Published
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Gowski, DT
Delgado, E
Miro, AM
Tasota, FJ
Hoffman, LAlhof@pitt.eduLHOF
Pinsky, MRpinsky@pitt.eduPINSKY
Date: 1 January 1997
Date Type: Publication
Journal or Publication Title: Critical Care Medicine
Volume: 25
Number: 1
Page Range: 145 - 152
DOI or Unique Handle: 10.1097/00003246-199701000-00027
Schools and Programs: School of Medicine > Critical Care Medicine
Refereed: Yes
ISSN: 0090-3493
PubMed ID: 8989191
Date Deposited: 05 Mar 2012 19:56
Last Modified: 24 Jun 2018 05:55
URI: http://d-scholarship.pitt.edu/id/eprint/11245

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