Airway management for oral and maxillofacial surgery

North Polar Tube Reduces the Risk of Epistaxis during Nasotracheal Intubation: A prospective, Randomized Clinical Trial

Objective

In this study, a north polar tube (Portex^® North Polar tube [Ivory PVC Portex tube; Smiths Medical International, Hythe, United Kingdom]) (NPT) and spiral tube (ST) were compared for their ability to provide a nasal airway in patients during maxillofacial surgery.

Methods

Patients who were aged 18 to 65 years with American Society of Anaesthesiologists score 1 to 2 and Mallampati score 1 to 2 were included in the study. The anesthesia technique was standardized in all patients. Patients were divided into 2 groups randomly: the NPT (n = 35) and ST groups (n = 35). Anesthesia was administered with 1% to 2% sevoflurane and a mixture of 50% oxygen + 50% air in both groups. The mean arterial pressure and heart rate values of preinduction; preintubation; and the first, second, third, and fifth minutes of intubation were recorded. Epistaxis, intraoral bleeding, cuff burst, use of Magill pens, duration of intubation, intubation difficulty, laryngeal compression, head position change, and glottic grade were evaluated.

Results

There were no significant differences between groups in terms of demographic data (gender, age, height, weight, body mass index, American Society of Anaesthesiologists score, and Mallampati score). Macintosh laryngoscopes were used during intubation in all patients. There was no significant difference between groups in terms of intubation difficulty, duration of intubation, use of Magill pens, and determination of the glottic grade (P > 0.05). Epistaxis was significantly lower in the NPT group than in the ST group (P = 0.012). Intraoral bleeding was significantly higher in the ST group than in the NPT group (P = 0.001). During intubation, laryngeal compression (Sellick maneuver) and head position changes were significantly lower in the NPT group than in the ST group (P = 0.003 and P < 0.001, respectively). There were no significant differences in mean arterial pressure and heart rate between the 2 groups.

Conclusions

We conclude that the NPT was associated with less epistaxis and manipulations such as laryngeal compression and head position changes when compared with the ST during nasotracheal intubation. The velvet-soft polyvinyl chloride material of the NPT appears to be responsible for this advantage.

[A randomised crossover trial comparing the Airtraq(®) NT, McGrath(®) MAC and Macintosh laryngoscopes for nasotracheal intubation of simulated easy and difficult airways in a manikin]

OBJECTIVE

Several devices can aid nasotracheal intubation when managing difficult airways. The McGrath MAC and Airtraq NT were compared with a Macintosh laryngoscope when studying the performance of anaesthetists with different levels of experience, in a manikin model of easy or difficult airway scenarios.

METHODS

Sixty-three anaesthetists were recruited into a randomised trial in which each performed nasotracheal intubation with all laryngoscopes, in both scenarios. The main endpoint was intubation time. Additional endpoints included laryngoscopic view, intubation success, number of optimisation manoeuvres, audible dental clicks and the force applied to the upper airway.

RESULTS

Intubation time was significantly shorter using the McGrath MAC in both scenarios and using the Airtraq in the difficult scenario, when compared with the Macintosh laryngoscope. Both devices gave more Cormack and Lehane grade 1 or 2 views than the Macintosh in the difficult scenario (p<0.001). The McGrath MAC had the best first-attempt success rate (98.4% vs. 96.8% and 95.8%, p<0.001 for the Airtraq NT and Macintosh laryngoscopes respectively). The number of optimisation manoeuvres, audible dental clicks and subjective assessment of the degree of force applied were significantly lower for indirect laryngoscopes versus the Macintosh laryngoscope (p<0.001).

CONCLUSION

In a manikin, the Airtraq and the McGrath laryngoscopes appeared superior to the Macintosh laryngoscope when dealing with simulated airway scenarios. Both devices were associated with better views, intubation times and rates of success, especially in a simulated "difficult airway". Overall satisfaction was highest with the McGrath laryngoscope. Similar clinical studies are needed.

Damage to the pilot balloon of the nasotracheal tube during orthognathic double-jaw surgery: A case report

In oral and maxillofacial surgery, many complications associated with nasotracheal tube can be caused. In this case, we reported ballooning tube damage of nasotracheal tube during orthognathic double-jaw surgery and replacement of tube through cut down of tube and tube exchange using airway exchange catheter. The patient scheduled for high Le Fort I osteotomy and bilateral sagittal split osteotomy was intubated nasotracheally with nasal endotracheal tube. During maxilla osteotomy, air bubble was detected in the oral blood. In spite of our repeated ballooning, the results were the same so we changed damaged tube using airway exchange catheter aseptically. Tiny and superficial cutting site was detected in the middle of pilot tube. As we know in our case, tiny injury impeded a normal airway management and prevention is important.

A randomised crossover trial comparing the Airtraq(®) NT, McGrath(®) MAC and Macintosh laryngoscopes for nasotracheal intubation of simulated easy and difficult airways in a manikin

OBJECTIVE

Several devices can aid nasotracheal intubation when managing difficult airways. The McGrath MAC and Airtraq NT were compared with a Macintosh laryngoscope when studying the performance of anaesthetists with different levels of experience, in a manikin model of easy or difficult airway scenarios.

METHODS

Sixty-three anaesthetists were recruited into a randomised trial in which each performed nasotracheal intubation with all laryngoscopes, in both scenarios. The main endpoint was intubation time. Additional endpoints included laryngoscopic view, intubation success, number of optimisation manoeuvres, audible dental clicks and the force applied to the upper airway.

RESULTS

Intubation time was significantly shorter using the McGrath MAC in both scenarios and using the Airtraq in the difficult scenario, when compared with the Macintosh laryngoscope. Both devices gave more Cormack and Lehane grade 1 or 2 views than the Macintosh in the difficult scenario (p<0.001). The McGrath MAC had the best first-attempt success rate (98.4% vs. 96.8% and 95.8%, p<0.001 for the Airtraq NT and Macintosh laryngoscopes respectively). The number of optimisation manoeuvres, audible dental clicks and subjective assessment of the degree of force applied were significantly lower for indirect laryngoscopes versus the Macintosh laryngoscope (p<0.001).

CONCLUSION

In a manikin, the Airtraq and the McGrath laryngoscopes appeared superior to the Macintosh laryngoscope when dealing with simulated airway scenarios. Both devices were associated with better views, intubation times and rates of success, especially in a simulated "difficult airway". Overall satisfaction was highest with the McGrath laryngoscope. Similar clinical studies are needed.

Blind intubation device for nasotracheal intubation in 100 oral and maxillofacial surgery patients with anticipated difficult airways: a prospective evaluation

BACKGROUND AND OBJECTIVE

The blind intubation device is a newly developed light-guided intubation device for difficult nasotracheal intubation. The aim of this study was to evaluate its performance in adult patients with anticipated difficult airways.

METHODS

One hundred consecutive patients who required general anaesthesia with nasotracheal intubation for elective oral and maxillofacial surgery between March 2008 and August 2008 were recruited. In each case, the time for oesophagus airway successful placement, the attempts of the light-guiding catheter insertion into the trachea, the attempts of the endotracheal tube intubation over the light-guiding catheter and the time from the oesophagus airway placement to the completion of endotracheal intubation were recorded. The associated complications were also recorded.

RESULTS

Fifty-nine male and 41 female patients were studied. Each of the patients had at least temporomandibular joint ankylosis, maxillary and mandibular fracture, oral cancer, obstructive sleep apnoea syndrome, mandibular hypoplasia and micrognathia and cervical tumour. The oesophagus airway was directly inserted into the trachea in six patients. The placement of the oesophagus airway was successful in remaining 94 patients. The median (interquartile range) time for the oesophagus airway placement was 47 (25-178) s. The overall success rate of the light-guiding catheter insertion was 95.0%. The overall success rate of the ETT intubation over the light-guiding catheter was 95.0%. The median (interquartile range) time for complete tracheal intubation process was 194 (22-380) s. There was no episode of hypoxaemia during tracheal intubation. In 28 (29.5%) of our patients, there was a small amount of blood present in the tip of the oesophagus airways or around the inner wall of the endotracheal tubes. No serious epistaxis was found either.

CONCLUSION

We have demonstrated the safe and effective use of the blind intubation device in 100 adult patients with anticipated difficult airways. The overall success rates of the oesophagus airway placement, the light-guiding catheter insertion and nasotracheal intubation over the light-guiding catheter were really satisfied. This technique could improve the success of blind nasal intubation, especially in situations in which fibreoptic equipment was unavailable. However, further studies are still required.

Safety culture and crisis resource management in airway management: general principles to enhance patient safety in critical airway situations

Airway management is a cornerstone of patient safety in anaesthesiology and in emergency and critical care medicine. Deficiencies in airway management could have catastrophic results for the patient. In anaesthesia patients, in particular, a high level of safety should be expected. It has been proven in other high-risk and complex industrial fields that obtaining very high levels of safety requires special strategies and safety philosophies in order to guarantee long-term low-risk production. The concept of safety culture has invaded many industries, more recently including medicine. Concepts of the high reliability organizations (HROs) are now ready to be adapted to medicine and offer promising improvements in health care. This paper applies some of the HRO principles to airway management and illustrates how to transform more general strategies to practical application in the clinical world. This includes the use of key elements of crisis resource management (CRM) and the development of a checklist for safety in airway management.