A clinical study to evaluate the difference between weight based criteria and cricoid-mental distance based criteria for LMA proseal size selection in adult patients undergoing general anesthesia.

Not yet recruiting

Conditions: Medical and Surgical, (2) ICD-10 Condition: O||Medical and Surgical,

Registration Number: CTRI/2021/12/038728

Lead Sponsor: Maulana Azad medical college

Brief Summary: Supraglottic airway devices (SADs), especially the laryngeal mask airway (LMA), have been extensively adopted as an alternative technique to tracheal intubation or mask ventilation for airway management in short length surgery .

More and more clinicians prefer SADs now than ever before. Recent studies have shown that 50% of patients under general anesthesia in the UK are ventilated with SADs .

Optimal size selection is critical to the safe and effective use of the laryngeal mask airway (LMA). ideally, the optimal LMA should be easy to insert; have an oropharyngeal leak pressure sufficient for positive pressure ventilation; a pharyngeal mucosal pressure less than capillary perfusion pressure; and be positioned such that instruments pass easily into the respiratory tract.

In clinical practice, however, the weight-based criterion is not always applicable, especially for patients in asthenic or stout shape as there is no linear correlation between the upper airway anatomy and body weight due to the individual anatomical variation, as previous studies have demonstrated that the first attempt success rate of LMA insertion based on weight was as low as 77% to 82% .

This study will be prospectively conducted to evaluate the efficacy of cricoid-mental distance-based method versus weight-based method in optimal size selection of Proseal LMA in adults undergoing elective surgery.

Detailed Description: Not available

Recruitment & Eligibility

Status: Not Yet Recruiting

Sex: All

Target Recruitment: 40

Inclusion Criteria

ASA grade I, II -Aged 18 to 60 years -body mass index (BMI) 18.
30kg/m2 Expected duration of surgery less than 3 hours.

Exclusion Criteria

Patients with high risk of regurgitation or aspiration -Patients with an anticipated difficult airway (including but not limited to a history of difficulty airway, mouth opening <2.5 cm, Mallampati class 4, limited neck extension or cervical spine pathology) -Known respiratory tract pathology -Planned surgery in lateral / prone position -Patients requiring endotracheal intubation.

Study & Design

Study Type: Interventional

Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
Insertion success at first attempt	From baseline to time of insertion

Secondary Outcome Measures

Name	Time	Method
Number of Attempts at Proseal insertion	1st attempt, 2 nd attempt, 3rd attempt.
Time to successful insertion	the interval beginning with picking up the airway device and ending when a successful airway device placement
Ease of insertion	graded from 1 to 4 (1 for no resistance, 2 for mild resistance, 3 for moderate resistance, 4 for unable to placement) by the operator who performed the insertion
Oropharyngeal leak pressure (OLP)

Trial Locations

Locations (1): Lok nayak hospital
🇮🇳
Central, DELHI, India
Lok nayak hospital
🇮🇳Central, DELHI, India
Nimith prabhakar
Principal investigator
9591915787
nimithp93@gmail.com