Oral Surgery, Maxillofacial Surgery
Conditions
Brief summary
Videolaryngoscope is useful to improve the laryngeal view, especially during difficult intubation. There are several kinds of videolaryngoscopes and it is applicable during nasotracheal intubation. In this study, the investigators will compare the McGrath videolaryngoscope and Pentax-AWS with Macintosh laryngoscope for nasotracheal intubation in patients with manual in-line stabilization.
Interventions
PROCEDUREMILS
MILS(Manual in-line stabilization) will be applied during intubation. With MILS, different kinds of laryngoscope will be evaluated in a simulated difficult airway.
McGrath videolaryngoscope will be used for intubation
Pentax AWS videolaryngoscope will be used for intubation
DEVICEMacintosh laryngoscope
Macintosh laryngoscope will be used for intubation
Sponsors
Ajou University School of Medicine
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
OTHER
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
19 Years to 60 Years
Healthy volunteers
No
Inclusion criteria
* oral or maxillofacial surgery * ASA class I, II
Exclusion criteria
* anticipated difficult intubation * necessity for rapid sequence induction * cervical spine injury * bleeding tendency
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| time for intubation | from holding the laryngoscope until the 1st ventilation after intubation, within 90 seconds | — |
| Cormack Lehane Laryngeal view | when laryngoscope is appropriately placed during intubation, approximately 2 seconds | — |
| POGP score | when laryngoscope is appropriately placed during intubation, approximately 2 seconds | Percentage of glottic opening(POGO) |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| numeric rating scale for intubation | during intubation, approximately 90 seconds | 0-10 (0; no difficulty, 10: hardest) |
| external laryngeal manipulation | when laryngoscope is appropriately placed during intubation, approximately 2 seconds | When the laryngeal view is insufficient during laryngoscope, another physician can manipulate the larynx externally to improve the laryngeal view. The necessity of external laryngeal manipulation will be recorded. |
| grade of bleeding | 10 seconds after completion of intubation | After confirmation of successful intubation, Yankauer suction was introduced to access the intraoral bleeding during intubation. Grade is 4 points scale (none/trace/moderate/severe). |
| magill forceps | when laryngoscope is appropriately placed during intubation, approximately 5 seconds | when the nasotracheal tube can not introduced to vocal cord manually, magill forceps can hold the tube to advance the tube through vocal cord. The necessity of magill forceps during intubation will be recorded |
| IDS (intubation difficulty scale) | during intubation, approximately 90 seconds | IDS score is the sum of the following seven variables: N1: the number of intubation attempts\>1 N2: the number of operators. 1 N3: the number of alternative intubation techniques used N4: glottic exposure (Cormack Lehane grade minus 1) N5: Lifting force required during laryngoscopy (0=normal; 1=increased) N6: necessity for external laryngeal pressure (0=not applied; 1=applied) N7: position of the vocal cords at intubation (0=abduction/ not visualized; 1=adduction) |
Outcome results
None listed