succinylcholine

Succinylcholine is a drug used as a muscle relaxant in surgery. It is administered intravenously, typically as a hydrated chloride compound.1

Succinylcholine belongs to the class of depolarizing neuromuscular blocking agents. When introduced into the body, it mimics the action of acetylcholine at the neuromuscular junction, causing a sustained depolarization of muscle fibers. This initial effect leads to widespread muscle twitching. However, this sustained depolarization quickly renders the muscle fibers unable to respond to nerve stimulation, resulting in paralysis.2

The paralysis induced by succinylcholine is temporary, lasting only a few minutes because the drug is rapidly broken down by cholinesterase enzymes in the plasma. It is often used to achieve rapid paralysis at the beginning of surgical procedures or for shorter operations.2

While widely used, succinylcholine has potential disadvantages. Patients may experience muscle aches for a day or two afterward. More seriously, individuals with abnormal plasma cholinesterase may experience prolonged paralysis. Succinylcholine can also cause a release of potassium from muscles, potentially leading to dangerous cardiac disturbances, especially in patients with severe burns or trauma. Additionally, it carries a rare risk of causing malignant hyperthermia, a rapid and potentially fatal increase in body temperature.2