Ultrasound guided paralaryngeal pressure versus cricoid pressure on the occlusion of esophagus: a crossover study

• Published in: Journal of clinical monitoring and computing Vol. 36; no. 1; pp. 87 - 92
• Main Authors: Lim, Siu Min, Ng, Boon Keat, Wilson, Aaron, Cheong, Chao Chia, Ng, Tyng Yan, Wang, Chew Yin
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.02.2022; Springer Nature B.V
• Subjects: Anesthesia; Anesthesiology; Critical Care Medicine; Eccentricity; Esophagus; Health Sciences; Intensive; Medicine; Medicine & Public Health; Occlusion; Original Research; Statistics for Life Sciences; Success; Trachea; Ultrasonic imaging; Ultrasonic testing; Cricoid pressure; Aspiration; Paralaryngeal pressure; Rapid sequence induction; Esophagus
• ISSN: 1387-1307; 1573-2614
• DOI: 10.1007/s10877-020-00623-7

The primary objective of this study is to compare the effectiveness of cricoid pressure (CP) and paralaryngeal pressure (PLP) on occlusion of eccentric esophagus in patients under general anesthesia (GA). Secondary objectives include the prevalence of patients with central or eccentric esophagus both before and after GA, and the success rate of CP in occluding centrally located esophagus in patients post GA. Fifty−one ASA physical status I and II patients, undergoing GA for elective surgery were enrolled in this study. Ultrasonography imaging were performed to determine the position of the esophagus relative to the trachea: (i) before induction of GA, (ii) after GA before external CP maneuver, (iii) after GA with CP, and (iv) after GA with PLP. CP was applied to all patients whilst PLP via fingertip technique was only applied to patients with an eccentric esophagus. Among a total of 51 patients, 28 of them (55%) had eccentric esophagus pre GA, while this number increase to 33 (65%) after induction of GA. CP success rate was 100% in 18 patients with central esophagus post GA versus 27% in 33 patients with eccentric esophagus post GA ( P <0.00001). Overall success rate for CP was 53%. In 33 patients with eccentric esophagus anatomy post GA, PLP success rate was 30% compared with 27% with CP ( P =1.000). Ultrasound guided PLP fingertips technique was not effective in patients with an eccentrically located esophagus post GA. Ultrasound guided CP achieved 100% success rate in patients with a centrally located esophagus post GA.