Airway Obstruction Clinical Trial
Official title:
The Effect of Supraglottic Airway Insertion on the Accuracy of Cricothyroid Membrane Identification in Females- a Prospective Observational Study.
Prospective, observational, study that will examine if a sited supraglottic airway (the igel)
will increase the accuracy of identifying the cricothyroid membrane in female patients.
Consented patients that meet inclusion criteria are assessed by clinicians under general
anaesthesia with and without a supraglottic airway in situ. The accuracy of CTM
identification by palpation will be evaluated using ultrasound.
Palpation of the airway structures results in misidentification of the cricothyroid membrane
(CTM) in a high proportion of women. Female front of neck anatomy is less distinct compared
to males with reduced angulation of the laryngeal cartilages making it harder to distinguish
the relevant landmarks. In obese patients, overlying subcutaneous tissue compounds this
problem and several studies have demonstrated poor success identifying the CTM by palpation
in this population. Supraglottic airway device (SAD) insertion precedes emergency front of
neck access attempts in the stepwise progression from failed intubation to cricothyroidotomy.
The nature and clinical implication of SAD insertion on cricothyroidotomy remain unstudied.
Sixty four patients will undergo front of neck airway assessment by volunteer clinicians with
and without a SAD in situ (control and SAD assessments, within-subjects design). The patients
are fasting women presenting for routine gynaecological surgery. Eight anaesthetists, at
different levels of training, will perform eight individual CTM assessments with and without
the SAD in situ.
Ultrasound images will be captured in the sagittal plane immediately before and after
supraglottic airway insertion. Images are then downloaded, anonymised and randomised for
blinded digital analysis.
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