Difficult tracheal intubation is a cause of severe patient damage and death. There is not a good method to predict it. The McGrath Series 5 video laryngoscope can improve visualization of the glottic structures one to two grades. Moreover unlike a classical laryngoscope with a Macintosh blade, the McGrath provides a view of the glottis without requiring alignment of the oral, pharyngeal and laryngeal axes. In this study, the investigators will use it to compare the Cormack-Lehane score in sedation and anesthesia condition. It helps to know the role of videolaryngoscope in predicting difficult intubation.
* The enrolled patients were given a bolus of sufentanil 0.3-0.5μg/kg to achieve Ramsay sedation score 2-3. The Cormack-Lehane score in sedation was evaluated by McGrath videolaryngoscope. * Then the patients were induced with propofol. A bolus of rocuronium was given to facilitate intubation. The Cormack-Lehane score in anesthesia was recorded when intubated by McGrath videolaryngoscope. * BMI, mouth opening, thyromental distance, intubation duration and ramsay sedation score were also recorded. * To compare the Cormack-Lehane score in sedate and anesthesia condition
Study Type
INTERVENTIONAL
Allocation
NA
Purpose
DIAGNOSTIC
Masking
SINGLE
Enrollment
97
A kind of portable videolaryngoscopes, produced by Aircraft Medical. It has been used for difficult airway.
Tongji Hospital, Huazhong University of Science and Technology
Wuhan, Hubei, China
Cormack-Lehane score in sedation condition
Based on the Modified Cormack-Lehane classification. 5 degrades. 1-5
Time frame: 5 minutes after administration of sufentanil
Cormack-lehane score in anesthesia condition
Based on the Modified Cormack-Lehane classification. 5 degrades. 1-5
Time frame: 1 minute after administration of rocuronium
Duration of intubation
The duration of intubation is defined as the time from inserting videolaryngoscope, intubating a tube, to withdrawing videolaryngoscope using a stopwatch.
Time frame: At intubation
Sedation score
by Ramsay sedation score 1-6. The higher score, the deeper sedation
Time frame: 5 minutes after administraion of sufentanil
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