Literature Review: In 1961, British Anesthesiologist Brian Sellick published a description of a technique to occlude the esophagus of patients undergoing anesthesia as a means to prevent regurgitation and pulmonary aspiration of gastric contents. Although Sellick’s publication referred only to a small case series, and not a controlled scientific investigation, his technique of applying pressure to the cricoid cartilage has become a widespread standard of care among anesthesia providers. Sellick described the correct way to perform this maneuver is to apply backward pressure of the cricoid cartilage against the bodies of the vertebrae without occluding the trachea (Sellick, 1961). However, more recent research calls the effectiveness of Sellick’s maneuver into question. Studies show controversies on the amount of pressure that should be applied (Vanner & Pryle, 1997), uncertainties by personnel performing it (namely ICU and ED nurses) about the correct anatomical landmark the pressure should be applied to (Black, Carson, & Doughty, 2012), and that Sellick's maneuver may increase the risk of aspiration rather than decrease it (Garrard et.al, 2004) because the esophagus might not truly be completely occluded (Smith et. al, 2003).
Methods: An informal, anonymous survey was created on SurveyMonkey and sent out to a total of 100 CRNAs who worked at Premier Clinical Research University Medical Center and 46 SRNAs who attended the Nurse Anesthesia Program in the School of Medicine in the same university in the Spring of 2016 which resulted in a response rate of 47.9%
Results: The results demonstrated that only 4.29% of respondents agreed that applying cricoid pressure occluded the esophagus greater than 75% of the time, 53.6% thought that it further diminished the view of the airway during larygoscopy, and 98% of respondents knew at least one way in which it increased the risk for regurgitation. Furthermore, 76.2% answered that the main reason they performed Sellick's maneuver was because it is legally expected of them and not because of its medical benefits to patients.
Evaluation: This unsafe technique is not only performed by CRNAs or SRNAs, but by OR, ICU, and ED nurses as well, and could potentially be putting patient's lives at risk each time it is performed. In a day where evidence-based practice is the expected norm, it is crucial for health care providers to re-evaluate this technique and further study and then implement more effective methods to prevent pulmonary aspiration, including: administering proton-pump inhibitors, decompression of stomach contents with nasogastric tubes, and placing patients in the reverse trendelenburg position during intubation.
Black, S.J., Carson, E.M., & Doughty, A. (2012). How much and where: Assessment of Knowledge level of the application of cricoid pressure. The Journal of Emergency Nursing, 28(4), 370-374.
Sellick, B.A. (1961). Cricoid pressure to control regurgitation of stomach contents during induction of anaesthesia. Lancet, 2. p. 404–406.
Smith, K..J., Dobranowski, J., Yip, G., Dauphin, A., & Choi, P.T. (2003). Cricoid pressure displaces the esophagus: An observational study using magnetic resonance imaging. Anesthesiology, 99(1), 60-64.
Vanner, R.G., O'Dwyer, J.R., Pryle, B.J., & Reynolds, F. (1992). Upper oesophageal sphincter pressure and the effect of cricoid pressure. The Journal of Anaesthesia, 47(2), 95-100.
Vanner ,R.G., & Pryle, B.J. (1997). Regurgitation and oesophageal rupture with cricoid pressure: a cadaver study. The Journal of Anaesthesia, 47(9),732-5.