A study to compare the view of laryngeal or voice box opening and ease of putting an artificial tube in the wind pipe (trachea), between Miller and Macintosh laryngoscopic blades in adult patients undergoing general anaesthesia for surgeries in the operation theatre.

A study to compare laryngoscopic view and ease of tracheal intubation between Miller and Macintosh blades in adult patients.

Status

Active, not recruiting

Phases

Phase 4

Study type

Interventional

Source

CTRI

Registry ID

CTRI/2022/12/048564

Enrollment

166

Registered

2022-12-28

Start date

Unknown

Completion date

Unknown

Last updated

2023-01-09

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

Conditions

Health Condition 1: 4- Measurement and Monitoring Health Condition 2: 4- Measurement and Monitoring

Interventions

Intervention1: Miller Blade: Miller is a straight blade with a slight upward curve near the tip. The total duration of this intervention will be 1 to 3 minutes. Control Intervention1: Macintosh blade:

Eligibility

Inclusion criteria

Inclusion criteria: 1.Patients with ASA class I and class II. 2.Patients willing to participate in the study with informed consent.

Exclusion criteria

Exclusion criteria: 1. Systemic hypertension 2. Morbid obesity(Body Mass Index > 30) 3. Coronary artery disease 4. H/o cerebrovascular accidents 5. Valvular heart diseases 6. If rapid sequence induction is required

Design outcomes

Primary

Measure	Time frame
1.To compare the laryngoscopic view between Miller and Macintosh blades at the time of laryngoscopy in adults. 2.To compare the ease of tracheal intubation between Miller and Macintosh blades in adults Timepoint: At the time of laryngoscopy	—

Secondary

Measure	Time frame
1.To compare the haemodynamic stress response to laryngoscopy and tracheal intubation between Miller and Macintosh bladesTimepoint: just before (0th minute) and 1st, 3rd, 5th, 10th, 15th, 20th minute after laryngoscopy and intubation	—

Countries

India

Contacts

Public ContactDr V Chandhana

Mandya Institute of Medical Sciences

mcbsanthu@gmail.com9886811263

Outcome results

None listed

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