The investigators will study to what extent insufflation of oxygen via the suction channel of a flexible bronchoscope can help with making access from the mouth to the trachea easier when there is blood or secretions in the way. We provide the oxygen-flow from the circle-system of an anaesthesia-machine and in this way we can limit the pressure to 30 and 40 cm H2O which are relatively safe pressure-levels. The endoscopy is performed on a plastic manikin and artificial sputum mixed with artificial blood is used. The procedure will be performed by 64 anaesthetists that will be randomised to use either oxygen-insufflation or not. The setup is cross-randomised so that each participant will perform two attempts, one with insufflation and one without. The procedures will be video-taped and evaluated by a blinded observer regarding a) success/failure of advancing the scope to the mid trachea under vision, b) the duration of the procedure. Additionally, subjective scores regarding the benefit of using insufflation will be obtained
The investigators will study to what extent insufflation of oxygen via the suction channel of a flexible bronchoscope can help with making access from the mouth to the trachea easier when there is blood or secretions in the way. We provide the oxygen-flow from the circle-system of an anaesthesia-machine and in this way we can limit the pressure to 30 and 40 cm H2O which are relatively safe pressure-levels. The endoscopy is performed on a plastic manikin and artificial sputum mixed with artificial blood is used. The procedure will be performed by 64 anaesthetists that will be randomised to use either oxygen-insufflation or not. The setup is cross-randomised so that each participant will perform two attempts, one with insufflation and one without. The procedures will be video-taped and evaluated by a blinded observer regarding a) success/failure of advancing the scope to the mid trachea under vision, b) the duration of the procedure. Additionally, subjective scores regarding the benefit of using insufflation will be obtained
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
SINGLE
Enrollment
64
addition of oxygeninsufflation via working channel of flexible scope in order to improve visibility when advancing the flexible scope
no-oxygen insufflation added to the flexible scope while advancing it
Rigshospitalet, Unoversity Hospital of Copenhagen
Copenhagen, The Capital Region, Denmark
The fraction of bronchoscopic advancements that result in a view of vocal cords (Fully or partial) without the view being obstructed by saliva or blood during the advancement
The fraction in whom The flexible scope is advanced to the trachea with maintained visibility all the time until vocal cord is seen
Time frame: 90 seconds
The scope is advanced to the trachea within 2 minutes
The flexible scope is advanced to the trachea with or without maintained visibility
Time frame: 2 minutes
Duration until the tip of the scope is in the trachea
Time from the tip of the scope passes the teeth until it is in the trachea
Time frame: 0-2 minutes
Operation percieved ease of advancing the scope to the trachea with maintained visibility
Operation percieved ease of advancing the scope to the trachea with maintained visibility, on a visual analogue scale from 1-10, 1 = very easy, 10 = almost impossible, lowest is best
Time frame: 2 minutes
Operation percieved ease of advancing the scope to the trachea, overall
Operation percieved ease of advancing the scope to the trachea overall, , on a visual analogue scale from 1-10, 1 = very easy, 10 = almost impossible, lower score is best.
Time frame: 2 minute
The scope is advanced to the trachea within 1 minute
The flexible scope is advanced to the trachea with or without maintained visibility
Time frame: 1 minute
unobstructed advancement to the trachea in two minutes
The flexible scope is advanced to the trachea with maintained visibility
Time frame: 2 minute
unobstructed advancement to the trachea in 90 seconds
The flexible scope is advanced to the trachea with maintained visibility
Time frame: 90 seconds
Obtaining a view of vocal cord(s) without obstruction of the view, obtained in 30 seconds
The fraction of participants in each group who obtain a view of vocal cord(s) without the view being obstructed at any point
Time frame: 30 sekunds
Obtaining a view of vocal cord(s) without obstruction of the view, obtained in one minute
The fraction of participants in each group who obtain a view of the vocal cord(s) without the view being obstructed at any point
Time frame: 1 minute
Obtaining a view of the vocal cord(s) without obstruction of the view, obtained in 90 seconds
The fraction of particip in each group who obtain a view of the vocal cord(s) without the view being obstructed, Obtained in 90 seconds
Time frame: 90 seconds
The fraction of brochoscopic advancements that results in Unobstructed advancement to the trachea in one minute
The fraction of the attempts when the flexible scope is advanced to the trachea with maintained visibility
Time frame: 1 minute
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