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High-Flow Nasal Cannula and Mandibular Advancement Bite Block Decrease Hypoxic Events during Sedative

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Area of Science:

  • Medical Devices
  • Gastroenterology
  • Anesthesiology

Background:

  • Sedated endoscopic examinations, like esophagogastroduodenoscopy (EGD), can lead to upper airway obstruction and hypoxemia.
  • Nasal breathing often shifts to oral breathing during EGD, potentially compromising oxygenation.

Purpose of the Study:

  • To evaluate the efficacy of high-flow nasal cannula (HFNC) and a mandibular advancement (MA) bite block in preventing hypoxemia and airway obstruction during sedated EGD.
  • To compare these airway devices against standard management.

Main Methods:

  • A randomized study enrolled 153 patients undergoing sedated EGD.
  • Patients were assigned to three groups: standard bite block with nasal cannula, HFNC, or MA bite block.
  • The primary endpoint was oxygen desaturation area under the curve (AUCDesat).

Main Results:

  • Both HFNC and MA bite blocks significantly reduced AUCDesat compared to standard management (p=0.019).
  • HFNC reduced hypoxic events by 18%, while MA bite blocks reduced hypoxic events by 12% and airway obstructions by 32%.
  • Both devices decreased the need for rescue interventions compared to standard care.

Conclusions:

  • HFNC and MA bite blocks effectively reduce the degree and duration of hypoxemia during sedated EGD.
  • HFNC may decrease hypoxemic events, while MA bite blocks may prevent airway obstruction and reduce rescue interventions.