Document Detail

Effectiveness of oxygenation and suction in cataract surgery: is suction of CO2-enriched air under the drape during cataract surgery necessary?
MedLine Citation:
PMID:  12579174     Owner:  NLM     Status:  MEDLINE    
PURPOSE: To investigate the effectiveness of aspiration of expired air by a suction system on peripheral oxygen saturation (SpO(2)) and end tidal carbon dioxide (EtCO(2)) during cataract surgery. MATERIALS AND METHODS: In total, 160 pre-medicated patients aged between 40 and 70 years (ASA I-III, classification of patients according to the American Society of Anesthesiologists) scheduled for cataract surgery under retrobulbar or peribulbar block were examined in a randomised, single-blind manner. The patients were sedated with 3 mg midazolam i.v. 15 min before operation and were monitored with an anaesthesia monitor. Heart rate (HR), non-invasive mean arterial pressure (MAP), SpO(2) and EtCO(2) were continuously measured using a standardised monitor. The first group (non-suction group, n = 80) received 4 L min(-1) O(2) with nasal cannule while the second group (suction group, n = 80) received 4 L min(-1) O(2) with nasal cannule, and the expired air was aspired with a Y-piece suction system. EtCO(2) was measured with the line of the sampling tube in the anaesthesia monitor. Respiratory rate (RR) was counted for a period of 1 min at each measurement time with thoracic excursions. The results were evaluated by unpaired t-test and analysis of variance. RESULTS: Severe reduction of SpO(2) and raising of EtCO(2) were observed significantly in the first group during the operation. RR, HR and MAP increased due to hypoxaemia. In the second group, SpO(2) was stabilised at high levels and EtCO(2) did not increase. RR, HR and MAP levels remained within the normal limits. Differences between the two groups were statistically significant (P < 0.05). CONCLUSION: During cataract surgery with local anaesthesia, SpO(2) decreases and RR, HR and MAP increase because of reinspiration of expired air under the drape. Insufflation of O(2) and aspiration of expired air with a suction system have prevented severe reduction of SpO(2) and raising of EtCO(2). It was suggested that O(2) delivery and use of an aspiration system decreased the risk of hypoxaemia significantly in the patients undergoing the cataract surgery.
U U Inan; R G Sivaci; F Oztürk
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Publication Detail:
Type:  Clinical Trial; Journal Article; Randomized Controlled Trial    
Journal Detail:
Title:  Eye (London, England)     Volume:  17     ISSN:  0950-222X     ISO Abbreviation:  Eye (Lond)     Publication Date:  2003 Jan 
Date Detail:
Created Date:  2003-02-11     Completed Date:  2003-03-05     Revised Date:  2009-11-03    
Medline Journal Info:
Nlm Unique ID:  8703986     Medline TA:  Eye (Lond)     Country:  England    
Other Details:
Languages:  eng     Pagination:  74-8     Citation Subset:  IM    
Department of Ophthamology, Kocatepe University School of Medicine, Afyon, Turkey.
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MeSH Terms
Anesthesia, Local
Anoxia / prevention & control
Carbon Dioxide / physiology
Intraoperative Care / methods*
Middle Aged
Monitoring, Intraoperative / methods
Oxygen / blood
Oxygen Inhalation Therapy*
Partial Pressure
Single-Blind Method
Reg. No./Substance:
124-38-9/Carbon Dioxide; 7782-44-7/Oxygen
Comment In:
Eye (Lond). 2004 Aug;18(8):789, author reply 789-90   [PMID:  15002030 ]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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