| Effect of airway diameter, suction catheters, and the bronchofiberscope on airflow in endotracheal and tracheostomy tubes. | |
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MedLine Citation:
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PMID: 1063116 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Pressure-flow relationships of an artificial airway-mechanical ventilator system were investigated. Endotracheal tubes varying from 7 to 9.5 mm. internal diameter and tracheostomy tubes from 7 to 10 mm. internal diameter were tested over flow-rates from 0.3 to 1.4 L. per second using a tidal volume of 500 ml. The effect of partial obstruction within these airways by suction catheters and the bronchofiberscope was examined. Depending on the internal diameter and the flow-rate, the driving pressure necessary to overcome the resistance of the tubes ranged from 5 to 20 cm. H2O. Partial obstruction of the artificial airways by suction catheters further increased this pressure. The introduction of the bronchofiberscope through an endotracheal tube of 7.5 mm. internal diameter, leaving an effective diameter of 4.9 mm., produced a driving pressure as high as 70 cm. H2O and reduced the flow rate to 50 per cent and the tidal volume to 80 per cent of its set value. Attention should be paid to duration of tracheobronchial suction while the patient is removed from the respirator since a high-grade resistance is created by passage of a suction catheter through an endotracheal tube. Bronchofiberscopy should be cautiously performed through cuffed artificial airways with at least 8 mm. internal diameter because the airway may be too comprised even if mechanical ventilatory assistance is employed. |
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Authors:
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H Baier; R Begin; M A Sackner |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Heart & lung : the journal of critical care Volume: 5 ISSN: 0147-9563 ISO Abbreviation: Heart Lung Publication Date: 1976 Mar-Apr |
Date Detail:
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Created Date: 1976-07-06 Completed Date: 1976-07-06 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 0330057 Medline TA: Heart Lung Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 235-8 Citation Subset: IM |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Bronchoscopes Bronchoscopy* Catheterization Drainage / instrumentation* Fiber Optic Technology Humans Intubation, Intratracheal / instrumentation* Pulmonary Ventilation* Tracheotomy Ventilators, Mechanical |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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