What are the two main laryngoscope blade types, and how do they differ?

• A. Macintosh (curved blade) and Miller (straight blade); different shapes to optimize glottic visualization.
• B. Miller (curved blade) and Macintosh (straight blade); different shapes to optimize glottic visualization.
• C. Both blades are curved; the difference is handle length only.
• D. Laryngoscope blades differ only in material, not shape.

Answer: (A)

The main idea here is how blade shape changes the way you lift tissues to visualize the glottis. The curved blade, the Macintosh, fits along the tongue’s curve. You insert the tip into the vallecula (the space between the base of the tongue and the epiglottis) and lift gently. That lifting acts indirectly on the epiglottis and opens the view of the vocal cords with typically less force and less tissue disruption.

The straight blade, the Miller, has a straight edge that is aimed directly under the epiglottis to lift it up. This direct lift can provide a good view in certain anatomies or when you need more leverage, such as in some pediatric airways or when the epiglottis sits in a position that’s easier to lift directly.

So, the two main blade designs differ primarily in their shape and the way they achieve glottic visualization: a curved blade that lifts via the vallecula, and a straight blade that lifts the epiglottis directly. This is why the option describing a curved Macintosh and a straight Miller best captures the difference.