Comparison of weight methods and anthropometric measurement of Hyocricoid Distance in predicting the appropriate size of Laryngeal Mask Airway in patients airway management

Comparison of the effect of choosing the size of LMA based on HCD with the standard method in the incidence of complications

A randomized clinical trial, triple blind, with control group on 100 patients, which Random Generator software will be used for randomization

All eligible patients referred to Imam Hossein hospital who must undergo eye surgery and general anesthesia by LMA are considered for the study. Patients who consent to enter the study with ASA I-II, age over 18 years and no contraindications for LMA implantation will be included in the study. These patients are subjected to neck anthropometric measurements by a fabric graduated ruler. With these calculations, the amount of CMD, HCD and TMD will be recorded with a centimeter scale and two decimal places. Then the patients will be divided into one of the weight groups (W) or HCD using Random Generator software. The person performing the airway management is blinded to the group. All patients were anesthesized using 2 μ/kg fentanyl, 20 mg lidocaine, 1.5 mg/kg propofol, and 25 mg atracurium and underwent propofol infusion at a dose of 100-200 μ/k/min. After the placement of LMA and two hours after the patient wakes up, the evaluation regarding airway complications is done by a person who is blinded to the group.

All eligible patients referred to Imam Hossein hospital who for any reason must undergo eye surgery and general anesthesia by LMA are considered for the study.

In the control group, LMA size will be selected based on weight, and in the intervention group, based on Hyocricoid Distance.

The success rate of LMA implantation based on effective ventilation and maximum expiratory pressure The rate of complications of LMA insertion such as sore throat, dry throat and dysphagia

Simple randomization will be done with the help of Random Generator Android version. The first group will be measured by weight method and the second group will be choosing the size of LMA based on Hyocricoid Distance. This software displays the number one or two, and for each patient, a number 1 or 2 is taken from this software and assigned to the appropriate group.

In this study, a person outside of the study will randomly (by use of software) assign a patient to a group and determines the size of the patient's LMA. A fixed person will insert the LMA according to the announced number, without knowing the patient's group. The third person will record the complications after the LMA insertion without knowing the patient's group.

all collected deidentified IPD

Access starts one month after results are published

The data will be available to all applicants.

The data will be available for scientific use only

Applicants will apply to ardeshir.tajbakhsh@gmail.com.

The request was submitted to the research committee of Shahid Beheshti University of Medical Sciences' Department of Anesthesia, and if approved, it will be available after a week.