Which is the only depolarizing muscle relaxant currently in clinical use?

Which is the only depolarizing muscle relaxant currently in clinical use?

• A. Ondansetron (Zofran)
• B. Ketorolac (Toradol)
• C. Lidocaine (Xilocaine)
• D. Succinylcholine (Anectine)

Answer: (D)

Succinylcholine is the only depolarizing muscle relaxant currently in clinical use. It works by mimicking the action of acetylcholine, binding to the neuromuscular junction and causing a persistent depolarization of the muscle membrane. This leads to initial muscle twitching, followed by paralysis that allows for relaxation during surgical procedures. Its rapid onset and short duration of action make it particularly useful for intubation and short surgical procedures. The other options listed are not classified as depolarizing muscle relaxants. Ondansetron functions as an antiemetic, commonly used to prevent nausea and vomiting. Ketorolac is a nonsteroidal anti-inflammatory drug (NSAID) used primarily for pain relief. Lidocaine is a local anesthetic that provides pain relief by blocking nerve signals but does not produce muscle relaxation in the context required for surgical procedures. Understanding the unique properties and purposes of these drugs highlights why succinylcholine is the only medication in this category actively used clinically for muscle relaxation during surgery.

Succinylcholine is the only depolarizing muscle relaxant currently in clinical use. It works by mimicking the action of acetylcholine, binding to the neuromuscular junction and causing a persistent depolarization of the muscle membrane. This leads to initial muscle twitching, followed by paralysis that allows for relaxation during surgical procedures. Its rapid onset and short duration of action make it particularly useful for intubation and short surgical procedures.

The other options listed are not classified as depolarizing muscle relaxants. Ondansetron functions as an antiemetic, commonly used to prevent nausea and vomiting. Ketorolac is a nonsteroidal anti-inflammatory drug (NSAID) used primarily for pain relief. Lidocaine is a local anesthetic that provides pain relief by blocking nerve signals but does not produce muscle relaxation in the context required for surgical procedures. Understanding the unique properties and purposes of these drugs highlights why succinylcholine is the only medication in this category actively used clinically for muscle relaxation during surgery.