Anatomic Features of the Neck and Preoperative Tests as Predictive Markers of Difficult Laryngoscopy
NCT ID: NCT02957084
Last Updated: 2016-11-07
Study Results
The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.
Basic Information
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COMPLETED
1142 participants
OBSERVATIONAL
2013-03-31
2014-12-31
Brief Summary
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The anatomic features of the neck measured were head extension, mouth opening, upper lip bite, Mallampati class, thyromental distance, sternomental distance, ratio of height to thyromental, neck circumference, thyrosternal distance, hyomental distance at full head extension (FHE) and at neutral position (NP), ratio of neck circumference to thyromental distance and ratio of hyomental distance FHE to hyomental distance NP.
Detailed Description
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The sample consisted of adult patients scheduled to receive general anaesthesia. Anatomic features of the neck were measured pre-operatively.
The anatomic features of the neck measured were thyromental distance, sternomental distance, ratio of height to thyromental, neck circumference, thyrosternal distance, hyomental distance at full head extension (FHE) and at neutral position (NP), ratio of neck circumference to thyromental distance and ratio of hyomental distance FHE to hyomental distance NP. The commonly used predictive tests head extension, mouth opening, upper lip bite test and Mallampati class were also measured.
The laryngoscopic view was classified according to the Cormack-Lehane Grade (1-4). Difficult laryngoscopy was defined as Cormack-Lehane Grade 3 or 4. Years of experience of the anaesthesiologists were recorded, as well as the number of tries needed to intubate the patient.
The optimal cut-off points for each predictive tests were identified by using receiver operating characteristic analysis. Sensitivity, specificity and positive predictive value and negative predictive value (NPV) were calculated for each test. Multivariate analysis with logistic regression, including all variables, was used to create a predictive model. Comparisons between genders were also performed to explore possible differences in diagnostic value and cut-off points. Finally, the years of experience of the clinician and the number of tries needed to intubate the patient were compared to assess risk of bias.
Conditions
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Keywords
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Study Design
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COHORT
PROSPECTIVE
Eligibility Criteria
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Inclusion Criteria
* BMI less than 35 kg/m2
* No known neck or airway pathology
* Scheduled for surgical procedures under general anaesthesia with tracheal intubation
Exclusion Criteria
* BMI higher than 35 kg/m2
* Obvious airway malformations
* Need for rapid sequence induction/intubation under cricoid pressure
* Awake intubation
* Cervical spine pathology requiring specific manipulation
* Obstetric cases
18 Years
ALL
No
Sponsors
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National and Kapodistrian University of Athens
OTHER
Responsible Party
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Chara Liaskou
RN, Msc, Phd(c)
Principal Investigators
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Chryssoula Staikou, MD, PhD, Assistant Professor
Role: STUDY_DIRECTOR
National and Kapodistrian University of Athens, 1st Department of Anaesthesia, Aretaieio Hospital
References
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Greek Society for Airway management, Basic and Advanced Management of the Airway, 2nd edition, Athens, 2011
Other Identifiers
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10634
Identifier Type: -
Identifier Source: org_study_id