An in Vivo CT Imaging Study of GMA-Tulip, I-gel, and LMA Supreme (GLAM-II)

Condition(s) studied

Investigational drug(s) / intervention(s)

GMA-Tulip: Under general anesthesia, GMA-Tulip laryngeal mask is inserted following standardized protocols. CT scanning and fiberoptic laryngoscopy are performed to assess insertion depth, anatomical alignment, and tissue compression.

I-gel: Under general anesthesia, I-gel laryngeal mask is inserted following standardized protocols. CT scanning and fiberoptic laryngoscopy are performed to assess insertion depth, anatomical alignment, and tissue compression.

LMA-Supreme insertion: Under general anesthesia, LMA Supreme laryngeal mask is inserted following standardized protocols. CT scanning and fiberoptic laryngoscopy are performed to assess insertion depth, anatomical alignment, and tissue compression.

Study summary

Laryngeal masks are core devices for supraglottic airway management, and the accuracy of their anatomical position directly impacts ventilation safety and the incidence of complications. Despite their wide clinical application, gaps remain in understanding their in vivo anatomical characteristics. This study aims to evaluate the in vivo anatomical features (e.g., insertion depth, anatomical alignment, tissue compression) of three laryngeal masks (LMA Supreme, I-gel, GMA-Tulip) using CT scanning in anesthetized patients undergoing CT interventional therapy, providing anatomical evidence for optimized laryngeal mask selection and complication prevention.

Eligibility

Primary outcome measure(s)

• Insertion depth of the three laryngeal masks — During CT scanning immediately after laryngeal mask insertion (within 30 minutes of insertion)
  Measurement of the distance from the laryngeal mask tip to the glottis and the upper edge of the 5th cervical vertebra (C5), and the relationship between the mask tip and the cricoid cartilage plate (via CT imaging)

Trial sites (2)

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