A 30 yr old man with paraplegia, the muscle relaxant should be avoided for tracheal intubation will be
## **Core Concept**
The question tests the understanding of muscle relaxants and their usage in patients with specific conditions, in this case, paraplegia. Paraplegia is a condition where there is an impairment in motor or sensory function of the lower extremities. The management of such patients, especially during procedures like tracheal intubation, requires careful selection of muscle relaxants to avoid complications.
## **Why the Correct Answer is Right**
Succinylcholine is a depolarizing muscle relaxant that works by mimicking the action of acetylcholine at the neuromuscular junction, leading to muscle depolarization and relaxation. However, in patients with paraplegia or other conditions leading to prolonged immobilization or denervation of muscles, there is an upregulation of nicotinic acetylcholine receptors. This can lead to a dangerous hyperkalemic response upon administration of succinylcholine, as the drug can cause a massive release of potassium ions from the muscles. This makes **Succinylcholine** a risky choice for patients with paraplegia.
## **Why Each Wrong Option is Incorrect**
- **Option A:** Not specified, assuming a non-depolarizing agent, which would not cause a significant hyperkalemic response in paraplegic patients and is generally safer in this context.
- **Option B:** Not specified, could potentially be a non-depolarizing agent, which would be safer than succinylcholine in this scenario.
- **Option D:** Not specified, similarly could be a safer alternative.
## **Clinical Pearl / High-Yield Fact**
A key point to remember is that succinylcholine can cause life-threatening hyperkalemia in patients with conditions that lead to muscle denervation, such as paraplegia, muscular dystrophy, or burns. Therefore, it's crucial to avoid succinylcholine in these patients for rapid sequence intubation or when muscle relaxation is needed for tracheal intubation.
## **Correct Answer: C. Succinylcholine**