Mivacurium chloride

A non-depolarizing neuromuscular blocking agent

Mivacurium chloride

Mivacurium chloride is a non-depolarizing neuromuscular-blocking drug or muscle relaxant used in anesthesia to facilitate endotracheal intubation and provide skeletal muscle relaxation during surgery or mechanical ventilation.

Pharmacology

Mivacurium is a member of the benzylisoquinolinium class of neuromuscular blockers. It acts by competing with acetylcholine for binding to nicotinic receptors at the neuromuscular junction, thereby inhibiting the action of acetylcholine and preventing muscle contraction.

Mechanism of Action

Mivacurium binds to the nicotinic acetylcholine receptors on the motor end plate, blocking the action of acetylcholine and leading to muscle relaxation. Unlike depolarizing neuromuscular blockers such as succinylcholine, mivacurium does not cause an initial depolarization of the muscle membrane.

Metabolism

Mivacurium is rapidly hydrolyzed by plasma cholinesterase into inactive metabolites. This rapid metabolism contributes to its short duration of action compared to other non-depolarizing neuromuscular blockers.

Clinical Use

Mivacurium is primarily used to facilitate endotracheal intubation and to provide muscle relaxation during surgical procedures. It is administered intravenously and has a rapid onset and short duration of action, making it suitable for short surgical procedures.

Dosage and Administration

The dosage of mivacurium is typically calculated based on the patient's body weight. It is administered as an intravenous bolus or continuous infusion, depending on the clinical situation and the desired duration of muscle relaxation.

Side Effects

Common side effects of mivacurium include hypotension, flushing, and bronchospasm. These effects are generally mild and transient. Rarely, patients may experience allergic reactions or prolonged neuromuscular blockade, especially in individuals with atypical plasma cholinesterase.

Contraindications

Mivacurium is contraindicated in patients with known hypersensitivity to the drug or any of its components. Caution is advised in patients with myasthenia gravis or other neuromuscular disorders, as they may be more sensitive to the effects of neuromuscular blockers.

Related pages

• Neuromuscular-blocking drug
• Anesthesia
• Endotracheal intubation
• Muscle relaxant