Evaluation of the LMA Position Using Ultrasound in Pediatric Patients

NCT ID: NCT01655459

Last Updated: 2012-08-01

Basic Information

• Recruitment Status: COMPLETED
• Total Enrollment: 100 participants
• Study Classification: OBSERVATIONAL
• Study Start Date: 2012-01-31
• Study Completion Date: 2012-07-31

Brief Summary

Introduction: Although the LMA insertion is not difficult and majority of the cases with LMA fare well in ventilation, the FOB assessment demonstrates a high incidence of LMA malpositioning. The LMA must be seated at the laryngeal inlet with the occlusion of esophageal inlet by the inflated tip. When we meet the signs of LMA malposition, we then reinsert the LMA. The laryngoscopic grading of Rowbottom et al. is commonly used for LMA position, but the rotated degree of LMA was not considered in that grading. We hypothesized that the LMA can affect the position of the arytenoids/thyroid cartilages and it may be detected on ultrasound. This study was designed to assess the predictability of the rotated LMA according to the position change of arytenoids/thyroid cartilages using ultrasound.

Methods: Children, aged 1 ms - 6 years, undergoing infraumbilical surgery were enrolled to this study. Ultrasound was performed on supraglottic and vocal cords area before and after LMA insertion. Transverse images were obtained on end-expiratory phase. LMA-position was evaluated with Bonfils fiberscopy. Position grading was made as usual. If grade >3 was showed, LMA was repositioned while fiberscopic watching. If the face of LMA was rotated to one-side, the LMA was rotated to the opposite side a little. The ultrasound findings of pre- and post-LMA were compared. On fiberscopic images, conventional LMA grade and the degree of rotation were measured.

Conditions

Infraumbilical Surgeries

Keywords

ultrasound, LMA, fiberoptic bronchoscopy

Study Design

• Observational Model Type: COHORT
• Study Time Perspective: CROSS_SECTIONAL

Study Groups

Ultrasound exam of upper airway

Following Internal Review Board approval(4-2011-0800) and written informed consent, total 100 patients(ASA I and II children aged 1 month to 6years) undergoing infra-umblicular urologic surgeries were included in the study. Children with upper respiratory tract infection, restricted mouth opening, congenital heart disease and those at risk for aspiration were excluded.

Ultrasound exam of upper airway

Intervention Type: PROCEDURE

LMA-position was evaluated with fiberoptic laryngoscopy. The ultrasound findings of pre- and post-LMA were compared.

Interventions

Ultrasound exam of upper airway

LMA-position was evaluated with fiberoptic laryngoscopy. The ultrasound findings of pre- and post-LMA were compared.

Intervention Type: PROCEDURE

Eligibility Criteria

Inclusion Criteria

• Aged 1 ms - 6 years,
• undergoing infraumbilical surgery

Exclusion Criteria

• coagulopathy
• pathologic lesions on neck or upper airway
• mallampati class III or IV
• difficult airway past history
• high risk group of aspiration pneumonitis

• Minimum Eligible Age: 1 Year
• Maximum Eligible Age: 6 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

Yonsei University

OTHER

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Other Identifiers

4-2011-0800

Identifier Type: -

Identifier Source: org_study_id