Cisatracurium, pure CIS isomer of atracurium all true except:-
**Core Concept**
Cisatracurium is a non-depolarizing neuromuscular blocking agent derived from the laudanosine-containing compound atracurium. Its unique mechanism of breakdown and pharmacokinetics make it distinct from other neuromuscular blockers.
**Why the Correct Answer is Right**
Cisatracurium's unique property is its spontaneous degradation via Hofmann elimination, a chemical process that occurs in plasma and is independent of liver or kidney function. This allows cisatracurium to be used in patients with renal or hepatic impairment. The pure CIS isomer of atracurium also has a faster onset and shorter duration of action compared to the racemic mixture of atracurium.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because cisatracurium's metabolism via Hofmann elimination is indeed a key characteristic.
**Option B:** This option is incorrect because the pure CIS isomer of atracurium does indeed have a faster onset of action compared to the racemic mixture of atracurium.
**Option C:** This option is incorrect because cisatracurium's pharmacokinetics are indeed independent of liver or kidney function.
**Clinical Pearl / High-Yield Fact**
Cisatracurium's unique metabolism via Hofmann elimination makes it an excellent choice for patients with renal or hepatic impairment, allowing for safe and effective neuromuscular blockade.
**Correct Answer: D.**