DAS Small Grant

The aim of this study is to assess how the use of a breathing tube (Supraglottic Airway Device) can affect the function of the jaw joint (Temporomandibular joint and jaw movement). This type of breathing tube is used for nearly 60% of general anaesthetics (1). To facilitate insertion of this breathing tube, assisted mouth opening and forward movement of the jaw are required. These movements occur at the Temporomandibular Joint (TMJ). For the duration of the operation the mouth is kept slightly open by this breathing tube. We wish to study whether this has any effect on the function of the jaw joint, 4 to 24 hours after the operation.

Patients over the age of 18 years, scheduled to have an operation (surgery) under general anaesthesia that requires the use of a supraglottic airway device to maintain the airway, shall be invited to take part in the study. We are aiming to recruit 130 participants (see sample size section) which should allow any significant differences in mouth opening and pain before and after the surgery to be realised.

We have liaised with our Patient and Public Research Advisory Group, who have reviewed the patient information leaflet (and suggested changes) and shall provide support during the study.

Patients who are eligible to take part and consent to the study will be asked several questions via questionnaire. The answers to these questions will be recorded and analysed on completion of the study. Measurements will also be taken by a research team member, including how much a patient can open their mouth, as well as forward and sideward movement of their lower jaw using a flexible ruler. Patient data regarding height, weight and BMI will also be collected. No other patient personal data will be used for this study.

The results of this study will help inform the training and clinical selection of patients for the use of supraglottic devices. This will impact education and help improve clinical practice, ultimately enhancing patient safety. If no differences in TMJ function are found, then this will provide further reassurance for the safety of supraglottic devices.

References:
(1). Cook TM, Woodall N, Frerk C, et al. Fourth National Audit Project of the Royal College of Anaesthetists and the Difficult Airway Society. Major Complications of Airway Management in the United Kingdom. NAP 4 Report. http://www.niaa.org.uk/NAP4-Report?newsid=513#pt