Bupivacaine

Bupivacaine is a long-acting amide local anesthetic that blocks voltage-gated sodium channels, interrupting nerve signals to produce local or regional anesthesia.

Voltage-gated sodium channel: A membrane protein that opens in response to voltage changes and allows sodium ions to cross cell membranes. Bupivacaine binds these channels and suppresses the action potentials that carry pain signals.
Spinal anesthesia: Anesthesia produced by injecting a local anesthetic into cerebrospinal fluid in the subarachnoid space. Bupivacaine is commonly used for spinal blocks, including anesthesia for surgery below the waist.
Lidocaine: An amide local anesthetic with a faster onset and generally shorter duration than bupivacaine. Its shorter action can suit brief procedures, while bupivacaine is often chosen for prolonged blocks.
Local anesthetic systemic toxicity: A potentially life-threatening reaction caused by excessive local anesthetic concentrations in the circulation. Accidental intravascular injection or excessive absorption of bupivacaine can cause this syndrome.
Amide local anesthetic: A local anesthetic whose molecular structure contains an amide linkage and is typically metabolized in the liver. Bupivacaine’s amide linkage places it in this class and shapes its metabolism.
Local anesthetic: A drug that temporarily prevents nerve conduction in a limited body region without causing unconsciousness. Bupivacaine is a long-acting member of this drug class.
Epidural anesthesia: Regional anesthesia produced by delivering drugs into the epidural space around the spinal cord. Bupivacaine is infused or injected epidurally for surgery, labor, and pain relief.
Ropivacaine: A long-acting amide local anesthetic developed as an alternative to bupivacaine. Ropivacaine has a lower propensity for cardiac toxicity and is often compared for regional blocks.
Bupivacaine cardiotoxicity: Cardiac conduction disturbance and impaired contractility caused by systemic bupivacaine exposure. Bupivacaine can bind cardiac sodium channels strongly, making severe overdose especially dangerous.
Stereochemistry: The study of how the three-dimensional arrangement of atoms affects a molecule’s properties and interactions. Bupivacaine is supplied as a racemic mixture, while its enantiomers differ in toxicity.

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