Final answer:
LMAs with gastric channel: ProSeal and Supreme. LMAs without gastric channel: Classic/Standard and Fastrach.
Step-by-step explanation:
Gastric Channel in LMAs
In Laryngeal Mask Airways (LMAs), the ProSeal and Supreme designs have a gastric channel. This gastric channel helps drain gastric contents away from the airway, reducing the risk of regurgitation and aspiration during anesthesia.
On the other hand, the Classic/Standard LMA design and the Fastrach LMA do not have a gastric channel.