SUX stands for which term?

• A. Sulfanyl Xenon
• B. Succinyl Chloride
• C. Sulfurex
• D. Succinylcholine

Answer: (D)

SUX is the shorthand for succinylcholine, a depolarizing neuromuscular blocker commonly used in prehospital rapid-sequence intubation. It works by briefly mimicking acetylcholine at the neuromuscular junction, causing an initial surge of muscle activity (fasciculations) followed by sustained depolarization that prevents further muscle contraction. Because it is rapidly broken down by plasma pseudocholinesterase, its effects are short-lived, giving a rapid onset of paralysis with a relatively brief duration—ideal for securing an airway quickly and then allowing spontaneous recovery of movement as the drug wears off.

The other terms listed are not standard drug names used in this context, so they do not represent a recognized EMS abbreviation for a paralytic agent. When using succinylcholine, be mindful of risks such as hyperkalemia in susceptible patients and the potential for malignant hyperthermia in predisposed individuals, along with contraindications in certain neuromuscular disorders or severe burns.