Document Detail

New equipment to prevent carbon dioxide rebreathing during eye surgery under retrobulbar anaesthesia.
MedLine Citation:
PMID:  10502572     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Carbon dioxide concentration under ophthalmic drapes increases during eye surgery under local anaesthesia. A new prototype has been designed which combines continuous suction of carbon dioxide enriched air and continuous oxygen insufflation under ophthalmic drapes to prevent carbon dioxide accumulation in spontaneously breathing patients undergoing cataract surgery. METHODS: In a prospective randomised single blind study the effectiveness of this new prototype was examined in 50 unpremedicated elderly patients. In 25 patients suction was applied under ophthalmic drapes, whereas in the other 25 patients no suction was used. In all cases oxygen was insufflated under the drapes at a constant flow of 2 l/min. Carbon dioxide concentration in the ambient air surrounding the patient's head under ophthalmic drapes, transcutaneous partial pressure of carbon dioxide, respiratory rate, and oxygen saturation were measured. RESULTS: Carbon dioxide concentration under the drapes, transcutaneous partial pressure of carbon dioxide, and respiratory rate remained unchanged in the suction group, whereas in the non-suction group these values increased significantly. Oxygen saturation rose significantly in both groups without differences between the groups. CONCLUSION: Application of this new prototype for continuous aspiration of carbon dioxide enriched air prevents carbon dioxide rebreathing and subsequent hypercapnia associated with an elevated respiratory rate. This new equipment may therefore be useful in patients undergoing ophthalmic surgery under retrobulbar anaesthesia.
A Schlager; H Staud
Publication Detail:
Type:  Clinical Trial; Journal Article; Randomized Controlled Trial    
Journal Detail:
Title:  The British journal of ophthalmology     Volume:  83     ISSN:  0007-1161     ISO Abbreviation:  Br J Ophthalmol     Publication Date:  1999 Oct 
Date Detail:
Created Date:  2000-01-11     Completed Date:  2000-01-11     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  0421041     Medline TA:  Br J Ophthalmol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  1131-4     Citation Subset:  IM; S    
Department of Anaesthesia and General Intensive Care Medicine, Division of Anaesthesia, The Leopold Franzens University of Innsbruck, Austria.
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MeSH Terms
Aged, 80 and over
Anesthesia, Local*
Carbon Dioxide / analysis*
Cataract Extraction*
Hypercapnia / prevention & control*
Intraoperative Care / instrumentation*
Intraoperative Complications / prevention & control
Middle Aged
Oxygen Inhalation Therapy
Prospective Studies
Single-Blind Method
Suction / instrumentation
Reg. No./Substance:
124-38-9/Carbon Dioxide

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