**Core Concept**
Atracurium is a non-depolarizing neuromuscular blocker used in intensive care units to facilitate mechanical ventilation. Its metabolism involves Hofmann elimination, a chemical process that occurs in plasma and tissues.

**Why the Correct Answer is Right**
The patient developed seizures after 2 days of atracurium infusion, suggesting a potential interaction or accumulation of the drug. Atracurium's metabolism can be affected by various factors, including temperature, pH, and the presence of other medications. The accumulation of laudanosine, a metabolite of atracurium, is a well-known side effect that can cause central nervous system (CNS) toxicity, including seizures.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not directly relate to the metabolism of atracurium or its potential side effects.
**Option B:** This option is incorrect as it is not a known interaction or side effect of atracurium.

**Clinical Pearl / High-Yield Fact**
Laudanosine, a metabolite of atracurium, can accumulate in patients with renal or hepatic dysfunction, leading to CNS toxicity. Monitor patients receiving atracurium for signs of seizures or other CNS effects.

**Correct Answer:** C. Laudanosine accumulation