Shoest acting nondepolarising muscle relaxant
**Core Concept**
The question is testing the knowledge of non-depolarizing muscle relaxants, a class of drugs used in anesthesia to facilitate endotracheal intubation and provide muscle relaxation during surgery. These drugs work by competitively inhibiting acetylcholine at the neuromuscular junction.
**Why the Correct Answer is Right**
The correct answer is a short-acting non-depolarizing muscle relaxant, which means it has a rapid onset and short duration of action, allowing for quick recovery from muscle relaxation. This is achieved through its high potency and rapid metabolism. Rocuronium is a good example, but the question does not specify the drug.
**Why Each Wrong Option is Incorrect**
**Option A:** Vecuronium is a long-acting non-depolarizing muscle relaxant, not short-acting.
**Option B:** Atracurium is an intermediate-acting non-depolarizing muscle relaxant, not short-acting.
**Option C:** Cisatracurium is also an intermediate-acting non-depolarizing muscle relaxant, not short-acting.
**Option D:** Mivacurium is a short-acting non-depolarizing muscle relaxant, but it is depolarizing at high concentrations.
**Clinical Pearl / High-Yield Fact**
When choosing a non-depolarizing muscle relaxant, consider the desired duration of action, the patient's underlying medical conditions, and the potential for side effects.
**Correct Answer: M. Mivacurium**