Marcaína Espinal Pesada (Bupivacaine Hydrochloride)

• Bupivacaine Hydrochloride is employed in the management of pain through spinal or epidural routes.
• Spinal anesthesia: produces profound sensory and motor block for surgical procedures performed under spinal technique.
• Epidural analgesia: provides continuous pain relief during labor, delivery, or postoperative periods.
• Postoperative pain control: extends analgesia after surgery when administered via neuraxial routes.

• Bupivacaine Hydrochloride reversibly binds to voltage‑gated sodium channels on neuronal membranes, stabilizing the inactive state of the channel. This inhibition prevents the initiation and propagation of nerve impulses, resulting in loss of sensation and motor function in the targeted region.

Adverse reactions may occur following intrathecal administration of bupivacaine.

Common Side Effects

• Hypotension: decreased blood pressure due to sympathetic blockade.
• Bradycardia: slowed heart rate, especially with high spinal levels.
• Nausea: gastrointestinal discomfort often related to hypotension.
• Pruritus: itching, frequently after epidural use.
• Urinary retention: difficulty voiding after spinal block.
• Headache: post‑dural puncture headache in some cases.

Serious or Rare Side Effects

• Cardiac arrest: severe conduction disturbances at high plasma concentrations.
• Seizures: central nervous system toxicity from excessive dosing.
• Respiratory depression: inadequate ventilation due to high spinal block.
• Allergic reaction: rash, angioedema, or anaphylaxis.
• Neurotoxicity: persistent neurological deficits after intrathecal injection.
• Persistent paresthesia: long‑lasting abnormal sensations.

• When using bupivacaine intrathecally, clinicians should consider several safety measures.
• Assess cardiac function: evaluate baseline heart rate and rhythm before administration.
• Monitor blood pressure: observe for hypotension and treat promptly.
• Avoid in known hypersensitivity: do not administer to patients with documented allergy to amide local anesthetics.
• Use lowest effective dose: titrate to achieve desired block while minimizing systemic exposure.
• Adjust in hepatic impairment: consider reduced clearance in patients with liver disease.
• Store at controlled room temperature: keep in original packaging, protect from moisture and light.

Bupivacaine may interact with other medications that affect cardiac conduction or metabolism.

Major Interactions (Avoid)

• Class I antiarrhythmics (e.g., quinidine): can potentiate cardiotoxic effects.
• Other local anesthetics: additive toxicity risk.
• CYP3A4 inhibitors (e.g., ketoconazole): may increase plasma levels.

Moderate Interactions (Monitor Closely)

• Beta‑blockers: may enhance bradycardia.
• Opioids: synergistic respiratory depression.
• Sedatives: increased risk of CNS depression.