Comparison of four insertion techniques of laryngeal mask airway: standard, 90-degree rotation, 180-degree rotation and insertion with thumb finger

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

IRCT

Registry ID

IRCT20190127042511N2

Enrollment

252

Registered

2021-11-29

Start date

2021-11-11

Completion date

Unknown

Last updated

2022-01-11

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Insertion of LMA.

Interventions

Intervention 1: Control group: Standard method of LMA insertion

In this method, the LMA mask is inserted using the index finger and advanced to the palatopharyngeal flexion to reach the hypopharynx to finally reach a real resistance. Intervention 2: Intervention g

Eligibility

Sex/Gender

All

Age

18 Years to 80 Years

Inclusion criteria

Inclusion criteria: ASA 1 or 2 Age 18 to 80 years

Exclusion criteria

Exclusion criteria: People with difficult airway with mouth openin less than 2.5 cm People at high risk for aspiration include non-fasting people with gastroesophageal reflux disease and pregnancy Patients with a history of sore throat in a recent month History of head, neck and stomach surgery Colds in the last 10 days Difficult intubation (mallampati> 3, TMD> 6.5) Coagulopathy BMI>30

Design outcomes

Primary

Measure	Time frame
First try attempt success rate of LMA insertion. Timepoint: After LMA insertion. Method of measurement: Observation.;Mean arterial pressure. Timepoint: 1min before LMA insertion and 1 , 5 min after interion. Method of measurement: NIBP.;End tidal CO2. Timepoint: After insertion. Method of measurement: Capnography.;Spo2. Timepoint: Base time (at rest),1min before LMA insertion and 1,5 min after insertion. Method of measurement: Puls oximeter.;Heart rate. Timepoint: Base time (at rest),1min before LMA insertion and 1,5 min after insertion. Method of measurement: Monitoring.;Side effects of masking include laryngospasm; blood on the mask; sore throat. Timepoint: When LMA removed. Method of measurement: Observation.;Calf air pressure need to prevent leakage. Timepoint: After insertion of LMA. Method of measurement: barometer.;Need for repositioning. Timepoint: At time of insertion. Method of measurement: Observation.;Attempts for insertion (1,2 or 3 times). Timepoint: At time of insertion. Method of measurement: Observation.;Total successful rate of LMA intertion. Timepoint: At time of insertion. Method of measurement: Observation.	—

Measure

Time frame

First try attempt success rate of LMA insertion. Timepoint: After LMA insertion. Method of measurement: Observation.;Mean arterial pressure. Timepoint: 1min before LMA insertion and 1 , 5 min after interion. Method of measurement: NIBP.;End tidal CO2. Timepoint: After insertion. Method of measurement: Capnography.;Spo2. Timepoint: Base time (at rest),1min before LMA insertion and 1,5 min after insertion. Method of measurement: Puls oximeter.;Heart rate. Timepoint: Base time (at rest),1min before LMA insertion and 1,5 min after insertion. Method of measurement: Monitoring.;Side effects of masking include laryngospasm; blood on the mask; sore throat. Timepoint: When LMA removed. Method of measurement: Observation.;Calf air pressure need to prevent leakage. Timepoint: After insertion of LMA. Method of measurement: barometer.;Need for repositioning. Timepoint: At time of insertion. Method of measurement: Observation.;Attempts for insertion (1,2 or 3 times). Timepoint: At time of insertion. Method of measurement: Observation.;Total successful rate of LMA intertion. Timepoint: At time of insertion. Method of measurement: Observation.

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Countries

Iran (Islamic Republic of)

Contacts

Public ContactSeyed Jalal Hashemi

Esfahan University of Medical Sciences

J_hashemi@med.mui.ac.ir+98 31 3224 3652

Outcome results

None listed

Source: IRCT (via WHO ICTRP) · Data processed: Feb 4, 2026