Does the Position of the Esophageal Entrance Determine the Cricoid Force Necessary to Occlude the Esophageal Lumen (CP)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT01746927
Recruitment Status : Unknown
Verified December 2013 by Ahed ZEIDAN, Procare Riaya Hospital.
Recruitment status was:  Recruiting
First Posted : December 11, 2012
Last Update Posted : December 3, 2013
Information provided by (Responsible Party):
Ahed ZEIDAN, Procare Riaya Hospital

Brief Summary:
This investigation was designed to assess if the the position of esophageal entrance would detrmine the cricoid force necessary to occlude the esophageal lumen? in anesthetized, paralyzed non obese patients using the Glidescope ® video laryngoscope (GVL).

Condition or disease Intervention/treatment
Aspiration Other: Glidescope Cricoid pressure

Detailed Description:

80 adult patients (40 women, 40 men) scheduled to undergo elective surgical procedures requiring general anesthesia and necessitating endotracheal intubation, were included in this study. Patients eligible for participation were aged 18-60 yrs., ASA physical status I or II and BMI < 30 kg/m2. Before anesthesia induction, CP was verified as follow: the cricoid cartilage was first identified and then held between the thumb and middle finger and the pressure was applied by the index finger with a force that could be tolerated by the patient. After loss of consciousness, four predetermined forces: 0 , 10 , 20 and 30 N were chosen in a randomized method. Therefore, after applying the predetermined force, a GT 20 F insertion trial was performed and two outcomes were considered: 1) Failure of GT insertion: effective CP. The next trials were not attempted. 2) Success of GT insertion: ineffective CP. The patient received a second attempt with increasing force to the next scale of force. If the attempt was effective (failure of GT insertion) , the relevant force is considered as the effective CP force. Same trial was repeated using 0, 10, 20 and 30 N respectively in in a randomized fashion for each patient. The cricoid force was standardized by reproducing 10, 20 and 30 N on a weighing scale prior to each application.

Four anesthesia providers (operators) participated in the study: The first operator performed CP in all patients with his back towards the video monitor; the second operator performed laryngoscopy using GVL and GT insertion trials and he was not aware about the nature of study ; the third operator assessed the effectiveness of the applied CP and determined the position of the esophageal entrance in relation to the glottis. The fourth operator, who was standing behind the second operator, signaled to the second operator to start attempt for each trial with the predetermined CP forces and to the first operator who applying CP to stop or continue accordingly.

In order to "blind" the second operator, a screen separated the laryngoscopist and the first operator applying CP, while the hand position for the CP was maintained, even when CP was not applied. Data collected before staring surgery.

Study Type : Observational
Estimated Enrollment : 80 participants
Observational Model: Case-Only
Time Perspective: Prospective
Official Title: Does the Position of the Esophageal Entrance Determine the Cricoid Force Necessary to Occlude the Esophageal Lumen?
Study Start Date : February 2012
Estimated Primary Completion Date : December 2014
Estimated Study Completion Date : December 2014

Group/Cohort Intervention/treatment
cricoid pressure Other: Glidescope Cricoid pressure
The current study test by direct visual evidence the occlusion of esophageal entrance during application CP. The closure of the lumen was further demonstrated by the inability to introduce a GT into the esophagus during CP. using in radimized method : 0 N,10 N, 20N AND 30 N

Primary Outcome Measures :
  1. Efficacy of Cricoid Pressure for Prevention of Aspiration [ Time Frame: 24 hours ]

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Ages Eligible for Study:   18 Years to 60 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Probability Sample
Study Population
normal healthy non obese patients

Inclusion Criteria:

•No-obese patients (BMI < 30)

  • ASA 1&2
  • G.A needs intubation

Exclusion Criteria:

  • ASA 3 and 4
  • Contre indication to cricoid pressure

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT01746927

Saudi Arabia
Procare Riaya Hospital Recruiting
Al Khobar, Estern, Saudi Arabia, 31952
Contact: Kamal Abdulkhalek, M.D.    00966505814754 ext 1140   
Principal Investigator: AHED ZEIDAN, MD         
Sponsors and Collaborators
Procare Riaya Hospital
Study Chair: Ahed Zeidan, MD Procare Riaya Hospital

Responsible Party: Ahed ZEIDAN, CONSULTANT ANESTHESIELOGIST, Procare Riaya Hospital Identifier: NCT01746927     History of Changes
Other Study ID Numbers: PRH05
First Posted: December 11, 2012    Key Record Dates
Last Update Posted: December 3, 2013
Last Verified: December 2013

Keywords provided by Ahed ZEIDAN, Procare Riaya Hospital:
cricoid pressure, glidescope