Force and Pressure Distribution Using Macintosh and GlideScope Laryngoscopes in Normal Airway: an in Vivo Study

Study Results

Results available

Outcome measurements, participant flow, baseline characteristics, and adverse events have been published for this study.

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Basic Information

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Recruitment Status

COMPLETED

Clinical Phase

NA

Total Enrollment

30 participants

Study Classification

INTERVENTIONAL

Study Start Date

2011-01-31

Study Completion Date

2011-12-31

Brief Summary

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Forces applied on soft upper tissues by different laryngoscope blades during direct laryngoscopy and intubation are considered to be major stimuli to cause serious damages to the patients. The aim of this study is to compare the force and pressure applied to soft tissue in order to achieve the same glottis view comparing direct laryngoscopy and videolaryngoscopy in vivo.

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Detailed Description

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Forces applied on soft upper tissues by different laryngoscope blades during direct laryngoscopy and intubation are considered to be major stimuli to cause serious damages to the patients, such as local injures to incisors, larynx and spinal column, or hemodynamic changes in heart rate and/or blood pressure due to autonomic nervous system stimulation.

In order to reduce risk of such injures, indirect videolaryngoscopy provides the advantage of an easier laryngeal visualization with less need for the mouth-pharyngeal-laryngeal axes alignment, thereby reducing the detrimental effects above mentioned.

The aim of this study is to measure the minimal force exertion to achieve not only glottis view but also a successful intubation, comparing GlideScope and Macintosh laryngoscope, in patients with normal airway conditions. Furthermore, The investigators measured the following parameters: pressure distribution upon the blade; time required to visualize the glottis; time required to complete oro-tracheal intubation.

Conditions

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Tracheal Intubation Laryngoscopy

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

PARALLEL

Primary Study Purpose

PREVENTION

Blinding Strategy

SINGLE

Participants

Study Groups

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Direct laryngoscope

Includes cases in which the forces applied by Macintosh direct laryngoscope onto soft tissue of the pharynx during glottis visualization and intubation were measured.

Group Type ACTIVE_COMPARATOR

Forces applied by laryngoscope

Intervention Type PROCEDURE

Force and pressure distribution applied by direct or indirect laryngoscope during glottis visualization and intubation were measured using film pressure transducers.

Indirect laryngoscope

Includes cases in which the forces applied by GlideScope indirect laryngoscope onto soft tissue of the pharynx during glottis visualization and intubation were measured.

Group Type ACTIVE_COMPARATOR

Forces applied by laryngoscope

Intervention Type PROCEDURE

Force and pressure distribution applied by direct or indirect laryngoscope during glottis visualization and intubation were measured using film pressure transducers.

Interventions

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Forces applied by laryngoscope

Force and pressure distribution applied by direct or indirect laryngoscope during glottis visualization and intubation were measured using film pressure transducers.

Intervention Type PROCEDURE

Eligibility Criteria

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Inclusion Criteria

* Patients classified as American Society of Anesthesiologists physical status (ASA-PS) class 1 or 2
* Patients whose intubation was associated with a Cormack-Lehane grade 1

Exclusion Criteria

* younger than 18 yrs
* older than 65 yrs
* body-mass index (BMI) between 18 and 30
* predicted difficult intubation according to SIAARTI (Italian Society Anaesthesia, Analgesia, Resuscitation and Intensive Care)

Minimum Eligible Age

18 Years

Maximum Eligible Age

65 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No