Prophylactic percutaneous transtracheal catheterisation in the management of patients with anticipated difficult airways: a case series

Transtracheal jet ventilation in a general tertiary hospital: A 7-year audit

Airway management in patients presenting with severe airway obstruction can present a challenge to the anaesthetist, as conventional difficult airway pathways are often inappropriate. The use of a transtracheal jet cannula is an alternative means of airway securement, but lack of familiarity has limited its use in general tertiary hospitals. We report a retrospective audit of the use of transtracheal jet ventilation in a general tertiary healthcare centre over the past seven years, with a total of 50 patients with severe airway compromise undergoing pharyngolaryngeal surgery. Transtracheal jet ventilation was successful in 98% of patients, and was the definitive means of airway management in 43 cases. In six cases, the technique was a useful temporising measure while the airway was secured by other means. Minor complications occurred in 12% of patients. No major morbidities or mortalities were recorded. We conclude that transtracheal jet ventilation for high-risk pharyngolaryngeal surgery can be performed using a high frequency jet ventilator, with a high rate of success and only minor complications. Cannulation of the trachea below the cricothyroid membrane is feasible but more challenging. Low-flow apnoeic oxygenation through the transtracheal jet ventilation cannula maintains oxygenation during initial surgical airway manipulation.

Transtracheal flow-regulated oxygen insufflation-a simple and safe method for prolonging safe apnoea time in difficult airway management: A report of two cases

In the absence of upper airway patency, supraglottic methods of oxygen delivery become ineffective. We present two semi-elective difficult airway cases where oxygenation via the supraglottic route was deemed impractical due to upper airway obstruction. In order to facilitate safe airway management, apnoeic oxygenation was delivered via a narrow bore transtracheal cannula using a flow-regulated oxygen insufflator. The potential for safely prolonging apnoea time with this technique in both elective and emergency settings is discussed.

Effect of nasal or nasopharyngeal apneic oxygenation on desaturation during induction of anesthesia and endotracheal intubation in the operating room: A narrative review of randomized controlled trials

OBJECTIVES

To determine whether apneic oxygenation through nasal or nasopharyngeal catheters can counteract hypoxemia and desaturation during induction of anesthesia and endotracheal intubation.

DESIGN

Narrative review of randomized controlled trials.

SETTING

Operating room.

PATIENTS

295 ASA I-II patients in elective surgery.

INTERVENTION

PubMed and Embase databases were searched for studies with apneic oxygenation. The review included randomized controlled trials with apneic oxygenation through nasal or nasopharyngeal catheters as the intervention in the setting of endotracheal intubation in adults.

MEASUREMENTS

Outcome measures were time until desaturation or degree of hypoxemia.

MAIN RESULTS

Eight randomized controlled trials were included, with a total of 295 patients. Apneic oxygenation was administered by nasopharyngeal catheter in four studies and by nasal catheter in four studies. The eight included articles studied apneic oxygenation at flow rates of 3-10 l/min in ASA I-II patients undergoing elective anesthesia in the operating room. Apneic oxygenation significantly prolonged time until desaturation opposed to the control groups in seven of the eight studies of patients undergoing anesthesia for elective surgery.

CONCLUSION

Apneic oxygenation through nasal or nasopharyngeal catheters can prolong time to desaturation and decrease degree of desaturation during induction of anesthesia and endotracheal intubation in adult ASA I-II patients undergoing anesthesia for elective surgery.

Percutaneous dilational tracheostomy

Tracheostomy is a commonly performed intervention with several benefits in the treatment of patients with chronic respiratory failure. Percutaneous dilational tracheostomy techniques have allowed bedside tracheostomy placement in the modern intensive care unit. Percutaneous dilational tracheostomy can be safely performed by interventional pulmonologists, medical intensive care physicians, and surgical specialists. When performed with the assistance of adjuncts, such as flexible bronchoscopy, the percutaneous dilational method has a favorable complication rate, efficiency, and cost profile compared with surgical tracheostomy.

Safety, efficiency, and cost-effectiveness of a multidisciplinary percutaneous tracheostomy program

OBJECTIVE

The frequency of bedside percutaneous tracheostomies is increasing in intensive care medicine, and both safety and efficiency of care are critical elements in continuing success of this procedure. Prioritizing patient safety, a tracheostomy team was created at our institution to provide bedside expertise in surgery, anesthesiology, respiratory, and technical support. This study was performed to evaluate the metrics of patient outcome, efficiency of care, and cost-benefit analysis of the multidisciplinary Johns Hopkins Percutaneous Tracheostomy Program.

DESIGN

A review was performed for patients who received tracheostomies in 2004, the year before the Johns Hopkins Percutaneous Tracheostomy Program was established, and those who received tracheostomies in 2008, the year following the program's establishment. Comparative outcomes were evaluated, including the efficiency of procedure and intensive care unit length of stay, complication rate including bleeding, hypoxia, loss of airway, and a financial cost-benefit analysis.

SETTING

Single-center, major university hospital.

PATIENTS

The sample consisted of 363 patients who received a tracheostomy in the years 2004 and 2008.

MEASUREMENTS AND MAIN RESULTS

The number of percutaneous procedures increased from 59 of 126 tracheostomy patients in 2004, to 183 of 237 in 2008. There were significant decreases in the prevalence of procedural complications, particularly in the realm of airway injuries and physiologic disturbances. Regarding efficiency, the structured program reduced the time to tracheostomy and overall procedural time. The intensive care unit length of stay in nonpulmonary patients and improvement in intensive care unit and operating room back-fill efficiency contributed to an overall institutional financial benefit.

CONCLUSIONS

An institutionally subsidized, multi-disciplinary percutaneous tracheostomy program can improve the quality of care in a cost-effective manner by decreasing the incidence of tracheostomy complications and improving both the time to tracheostomy, duration of procedure, and postprocedural intensive care unit stay.

The use of ultrasound to guide time-critical cannula tracheotomy when anterior neck airway anatomy is unidentifiable

BACKGROUND AND OBJECTIVE

Transtracheal or transcricothyroid placement of a cannula is a practice used in a number of aspects of airway management in anaesthesia and intensive care. In this study, we aimed to investigate whether the use of ultrasound will facilitate cannula placement in a time-critical situation in patients with difficult anterior neck airway anatomy.

METHOD

Fifty anaesthetists were randomised to either ultrasound-guided or conventional unguided attempts, at cannula insertion into a model simulating a patient with unidentifiable anterior neck anatomy. Endpoints were the success, and time to success, of cannula placement.

RESULTS

There was a significant increase in success rate (83 vs. 43%, P = 0.011) and a significant decrease in time to successful placement (median time to successful cannulation 57 vs. 110 s, P = 0.008) using ultrasound guided compared to unguided cannula placement.

CONCLUSION

If a 'can't intubate, can't oxygenate' scenario occurs in a patient with unidentifiable anterior neck airway anatomy in a location where an ultrasound machine is immediately available, we recommend that consideration is given to the use of ultrasound-guided cannula tracheotomy as the first-line rescue technique.

Role of cricothyroid cannulation in head and neck surgery

Objectives:

This paper outlines our use of cricothyroid cannulation in those patients undergoing head and neck surgery in whom a ‘difficult airway’ is anticipated. Audit results are presented.

Materials and methods:

Prospective data collection for all patients undergoing cricothyroid cannulation for management of head and neck neoplasms, over a two-year period.

Results:

Thirty-nine cricothyroid cannulae were sited in 32 patients. All patients with laryngeal tumours underwent the procedure while awake, prior to the anticipated difficult intubation, and the cannulae were removed within six hours. Most cannulations performed under general anaesthetic were for anticipated ‘dangerous extubations’ in patients with oral cavity tumours, and these cannulae remained in place for 24 hours. Tracheostomy was possibly avoided in six patients. No complications were identified.

Conclusion:

Cricothyroid cannulation can be a simple, safe, reliable technique which is a useful adjunct in the management of patients with a potentially difficult airway.

Perception of training needs and opportunities in advanced airway skills

BACKGROUND AND OBJECTIVE

We surveyed delegates at the Group of Anaesthetists in Training (UK) meeting to investigate evidence of a training-gap (number of fibreoptic intubations believed to bestow competence vs. number actually performed).

METHODS

Questionnaires were distributed to and collected from delegates in person. Questions covered six areas, including experience of fibreoptic intubation and cricothyrotomy, fibreoptic intubation as a specialist skill and ethical issues.

RESULTS

We received 221 replies (76%). All trainees believed competence to be achievable with 10 intubations (interquartile range (IQR) 10-20); the median number performed was 2 (IQR 0-4). This was statistically significant for the groups' senior house officers, 1st and 2nd year registrars and 3rd and 4th year registrars; P < 0.0001. Many final year trainees (12/20, 60%) also failed to achieve their competency target. Few trainees had seen or performed any cricothyrotomies (medians 0, IQRs 0-1 and 0-0). Most (195/208, 94%) believed that fibreoptic intubation was a core skill and 199/212 (94%) believed that all should be competent by completion of training. Ten percent (n = 208) felt it unethical to perform an awake training intubation with full consent and 10% believed it acceptable without explanation. Most (82.7%) would fibreoptically intubate an asleep patient (requiring intubation) without consent.

CONCLUSION

Trainees reported a gap between their perception of competence and achievement in awake fibreoptic intubation. Simple and complex simulations and structured training programmes may help. Anaesthetists must address the ethics of clinical training in advanced airway management.

A complication of transtracheal jet ventilation and use of the Aintree intubation catheter during airway resuscitation

We report the management of a patient requiring surgical laryngoscopy with a view to laser resection of an epiglottic recurrence of laryngeal cancer. Previous attempts at tracheal intubation and awake nasal fibreoptic intubation had failed. During a previous anaesthetic the patient had been both 'impossible to intubate and to ventilate'. Neck scarring potentially complicated access for transtracheal jet ventilation. Nevertheless, a cricothyroid catheter was placed and surgery performed during low frequency 'volume' jet ventilation. Upper airway obstruction developed during the procedure, preventing exhalation, which led to raised intrathoracic pressure, cardiovascular collapse and barotrauma. The airway was re-established by insertion of an LMA Proseal. Fibreoptic placement of an Aintree intubation catheter through this allowed re-oxygenation and exchange for a cuffed tracheal tube. Some hours after the procedure, re-intubation was necessary. This was achieved using the Aintree intubation catheter as an aid to nasal fibreoptic intubation and as a tube exchanger. Novel roles of the Aintree intubation catheter and LMA Proseal in this case are discussed. Complications of transtracheal jet ventilation as well as possible methods for avoiding them are also reviewed.

Surgical vs wire-guided cricothyroidotomy: a randomised crossover study of cuffed and uncuffed tracheal tube insertion

Using an airway mannequin and artificial lung model, we compared surgical cricothyroidotomy with a 6.0-mm cuffed Portex tracheostomy tube with wire-guided cricothyroidotomy using a 5.0-mm cuffed Melker or 6.0-mm uncuffed Melker tube. The trial was carried out by 27 anaesthetists using a randomised, crossover design. Surgical cricothyroidotomy proved significantly faster (mean (SD) time to first breath 44.3 (12.5) s for Portex surgical, 87.2 (21.6) s for cuffed Melker, 87.8 (19.2) s for uncuffed Melker, p < 0.001). With a standardised ventilator model, the cuffed tubes provided more effective ventilation (mean (SD) tidal volume 446 (41) ml Portex, 436 (52) ml cuffed Melker, 19 (5) ml uncuffed Melker, p < 0.001). Fourteen of the participants preferred the wire-guided system. We conclude that, in this model, a cuffed device is preferable when cricothyroidotomy is needed. In addition, the surgical method is quicker than a wire-guided approach.

Strategies and algorithms for management of the difficult airway

Management of the difficult airway is the most important patient safety issue in the practice of anaesthesia. Many national societies have developed algorithms and guidelines for management of the difficult airway. The key issues of this chapter are definition of terms, the advantages and disadvantages of the use of guidelines, and a comparison of different algorithms and guidelines for management of the most important clinical airway scenarios. Although there is no strong evidence of benefit for any specific strategy or algorithm for management of the difficult airway, there is strong agreement that a pre-planned strategy may lead to improved outcome.