Second-generation supraglottic airway devices (e.g., ProSeal LMA, i-gel) differ from first-generation devices primarily in:
- A Using a double-lumen design that allows simultaneous fibreoptic intubation and ventilation
- B Eliminating the risk of laryngospasm by incorporating a distal cuff that seats in the glottis
- C Providing a higher seal pressure and a separate gastric drainage channel ✓
- D Requiring mandatory neuromuscular blockade for insertion to achieve adequate depth
Explanation
Second-generation supraglottic airway devices are distinguished by two key features: an elevated oropharyngeal leak pressure (typically >25 cmH2O versus ~15–18 cmH2O for classic LMA), allowing positive-pressure ventilation at higher airway pressures; and a separate gastric channel that allows a suction catheter to drain regurgitated material and vents gastric contents, reducing aspiration risk. The i-gel achieves higher seal pressures through a gel-like non-inflatable cuff that conforms to supraglottic anatomy. These features make second-generation devices more appropriate for PPV and in patients with higher aspiration risk compared to the first-generation classic LMA.
Reference: Morgan & Mikhail's Clinical Anesthesiology, 6th ed.
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Written and medically reviewed by the StethoPrep medical team.