Bupivacaine

Bupivacaine, marketed under the brand name Marcaine among others, is a medication used to decrease feeling in a specific area.[1] In nerve blocks, it is injected around a nerve that supplies the area, or into the spinal canal's epidural space.[1] It is available mixed with a small amount of epinephrine to increase the duration of its action.[1] It typically begins working within 15 minutes and lasts for 2 to 8 hours.[1][2]

Bupivacaine
Clinical data
Pronunciation/bjuːˈpɪvəkeɪn/
Trade namesMarcaine, Sensorcaine, Vivacaine, others
AHFS/Drugs.comMonograph
Pregnancy
category
  • AU: A
    Routes of
    administration    		parenteral, topical
    ATC code
    Legal status
    Legal status
    • AU: S4 (Prescription only)
    Pharmacokinetic data
    Bioavailabilityn/a
    Protein binding95%
    MetabolismLiver
    Onset of actionWithin 15 min[1]
    Elimination half-life3.1 hours (adults)[1]
    8.1 hours (neonates)[1]
    Duration of action2 to 8 hr[2]
    ExcretionKidney, 4–10%
    Identifiers
    CAS Number
    PubChem CID
    IUPHAR/BPS
    DrugBank
    ChemSpider
    UNII
    KEGG
    ChEBI
    ChEMBL
    CompTox Dashboard (EPA)
    ECHA InfoCard100.048.993
    Chemical and physical data
    FormulaC18H28N2O
    Molar mass288.43 g/mol g·mol−1
    3D model (JSmol)
    Melting point107 to 108 °C (225 to 226 °F)
     NY (what is this?)  (verify)

    Possible side effects include sleepiness, muscle twitching, ringing in the ears, changes in vision, low blood pressure, and an irregular heart rate.[1] Concerns exist that injecting it into a joint can cause problems with the cartilage.[1] Concentrated bupivacaine is not recommended for epidural freezing.[1] Epidural freezing may also increase the length of labor.[1] It is a local anaesthetic of the amide group.[1]

    Bupivacaine was discovered in 1957.[3] It is on the World Health Organization's List of Essential Medicines, the safest and most effective medicines needed in a health system.[4] Bupivacaine is available as a generic medication and is not very expensive.[1][5] The wholesale cost in the developing world of a vial is about US$2.10.[6]

    Medical uses

    Bupivacaine is indicated for local infiltration, peripheral nerve block, sympathetic nerve block, and epidural and caudal blocks. It is sometimes used in combination with epinephrine to prevent systemic absorption and extend the duration of action. The 0.75% (most concentrated) formulation is used in retrobulbar block.[7] It is the most commonly used local anesthetic in epidural anesthesia during labor, as well as in postoperative pain management.[8] Liposomal formulations of bupivacaine are no more effective than plain solutions of bupivacaine.[9][10]

    Contraindications

    Bupivacaine is contraindicated in patients with known hypersensitivity reactions to bupivacaine or amino-amide anesthetics. It is also contraindicated in obstetrical paracervical blocks and intravenous regional anaesthesia (Bier block) because of potential risk of tourniquet failure and systemic absorption of the drug and subsequent cardiac arrest. The 0.75% formulation is contraindicated in epidural anesthesia during labor because of the association with refractory cardiac arrest.[11]

    Adverse effects

    Compared to other local anaesthetics, bupivacaine is markedly cardiotoxic.[12] However, adverse drug reactions (ADRs) are rare when it is administered correctly. Most ADRs are caused by accelerated absorption from the injection site, unintentional intravascular injection, or slow metabolic degradation. However, allergic reactions can rarely occur.[11]

    Clinically significant adverse events result from systemic absorption of bupivacaine and primarily involve the central nervous system (CNS) and cardiovascular system. CNS effects typically occur at lower blood plasma concentrations. Initially, cortical inhibitory pathways are selectively inhibited, causing symptoms of neuronal excitation. At higher plasma concentrations, both inhibitory and excitatory pathways are inhibited, causing CNS depression and potentially coma. Higher plasma concentrations also lead to cardiovascular effects, though cardiovascular collapse may also occur with low concentrations.[13] Adverse CNS effects may indicate impending cardiotoxicity and should be carefully monitored.[11]

    Toxicity can also occur in the setting of subarachnoid injection during high spinal anesthesia. These effects include: paresthesia, paralysis, apnea, hypoventilation, fecal incontinence, and urinary incontinence. Additionally, bupivacaine can cause chondrolysis after continuous infusion into a joint space.[11]

    Bupivacaine has caused several deaths when the epidural anaesthetic has been administered intravenously accidentally.[14]

    Treatment of overdose

    Animal evidence[15][16] indicates intralipid, a commonly available intravenous lipid emulsion, can be effective in treating severe cardiotoxicity secondary to local anaesthetic overdose, and human case reports of successful use in this way.[17][18] Plans to publicize this treatment more widely have been published.[19]

    Pregnancy and lactation

    Bupivacaine crosses the placenta and is a pregnancy category C drug. However, it is approved for use at term in obstetrical anesthesia. Bupivacaine is excreted in breast milk. Risks of discontinuing breast feeding versus discontinuing bupivacaine should be discussed with the patient.[11]

    Postarthroscopic glenohumeral chondrolysis

    Bupivacaine is toxic to cartilage and its intra-articular infusions may lead to postarthroscopic glenohumeral chondrolysis.[20]

    Pharmacology

    Pharmacodynamics

    Bupivacaine binds to the intracellular portion of voltage-gated sodium channels and blocks sodium influx into nerve cells, which prevents depolarization. Without depolarization, no initiation or conduction of a pain signal can occur.

    Pharmacokinetics

    The rate of systemic absorption of bupivacaine and other local anesthetics is dependent upon the dose and concentration of drug administered, the route of administration, the vascularity of the administration site, and the presence or absence of epinephrine in the preparation.[21]

    • Onset of action (route and dose-dependent): 1-17 min
    • Duration of action (route and dose-dependent): 2-9 hr
    • Half life: neonates, 8.1 hr, adults: 2.7 hr
    • Time to peak plasma concentration (for peripheral, epidural, or caudal block): 30-45 min
    • Protein binding: about 95%
    • Metabolism: hepatic
    • Excretion: renal (6% unchanged)[11]

    Chemical structure

    Like lidocaine, bupivacaine is an amino-amide anesthetic; the aromatic head and the hydrocarbon chain are linked by an amide bond rather than an ester as in earlier local anesthetics. As a result, the amino-amide anesthetics are more stable and less likely to cause allergic reactions. Unlike lidocaine, the terminal amino portion of bupivacaine (as well as mepivacaine, ropivacaine, and levobupivacaine) is contained within a piperidine ring; these agents are known as pipecholyl xylidines.[8]

    Cost

    Bupivacaine is available as a generic medication and is not very expensive.[1][5] The wholesale cost of a vial of bupivacaine is about US$2.10.[6]

    Research

    Levobupivacaine is the (S)-(–)-enantiomer of bupivacaine, with a longer duration of action, producing less vasodilation. Durect Corporation is developing a biodegradable, controlled-release drug delivery system for after surgery. It has currently completed a phase-III clinical trial.[22]

    References
    1. "Bupivacaine Hydrochloride". The American Society of Health-System Pharmacists. Archived from the original on 2015-06-30. Retrieved Aug 1, 2015.
    2. Whimster, David Skinner (1997). Cambridge textbook of accident and emergency medicine. Cambridge: Cambridge University Press. p. 194. ISBN 9780521433792. Archived from the original on 2015-10-05.
    3. Egan, Talmage D. (2013). Pharmacology and physiology for anesthesia : foundations and clinical application. Philadelphia, PA: Elsevier/Saunders. p. 291. ISBN 9781437716795. Archived from the original on 2016-05-12.
    4. World Health Organization (2019). World Health Organization model list of essential medicines: 21st list 2019. Geneva: World Health Organization. hdl:10665/325771. WHO/MVP/EMP/IAU/2019.06. License: CC BY-NC-SA 3.0 IGO.
    5. Hamilton, Richart (2015). Tarascon Pocket Pharmacopoeia 2015 Deluxe Lab-Coat Edition. Jones & Bartlett Learning. p. 22. ISBN 9781284057560.
    6. "Bupivacaine HCL". International Drug Price Indicator Guide. Archived from the original on 5 March 2017. Retrieved 29 August 2015.
    7. Lexicomp. "Bupivacaine (Lexi-Drugs)". Archived from the original on 2014-04-10. Retrieved 20 April 2014.
    8. Miller, Ronald D. (November 2, 2006). Basics of Anesthesia. Churchill Livingstone.
    9. Ma J, Zhang W, Yao S (December 2016). "Liposomal bupivacaine infiltration versus femoral nerve block for pain control in total knee arthroplasty: A systematic review and meta-analysis". Int J Surg. 36 (Pt A): 44–55. doi:10.1016/j.ijsu.2016.10.007. PMID 27742564.
    10. Kendall MC, Castro Alves LJ, De Oliveira G (2018). "Liposome Bupivacaine Compared to Plain Local Anesthetics to Reduce Postsurgical Pain: An Updated Meta-Analysis of Randomized Controlled Trials". Pain Res Treat. 2018: 1–10. doi:10.1155/2018/5710169. PMC 6077608. PMID 30112203.
    11. "Bupivacaine (Lexi-Drugs)". Archived from the original on 2014-04-10. Retrieved 20 April 2014.
    12. de La Coussaye, J. E.; Eledjam, J. J.; Brugada, J.; Sassine, A. (1993). "[Cardiotoxicity of local anesthetics]". Cahiers d'Anesthesiologie. 41 (6): 589–598. ISSN 0007-9685. PMID 8287299.
    13. Australian Medicines Handbook. Adelaide. 2006. ISBN 978-0-9757919-2-9.
    14. ABS-CBN Interactive: Filipino nurse dies in UK due to wrong use of anaesthetic
    15. Weinberg, GL; VadeBoncouer, T; Ramaraju, GA; Garcia-Amaro, MF; Cwik, MJ. (1998). "Pretreatment or resuscitation with a lipid infusion shifts the dose-response to bupivacaine-induced asystole in rats". Anesthesiology. 88 (4): 1071–5. doi:10.1097/00000542-199804000-00028. PMID 9579517.
    16. Weinberg, G; Ripper, R; Feinstein, DL; Hoffman, W. (2003). "Lipid emulsion infusion rescues dogs from bupivacaine-induced cardiac toxicity". Regional Anesthesia and Pain Medicine. 28 (3): 198–202. doi:10.1053/rapm.2003.50041. PMID 12772136.
    17. Rosenblatt, MA; Abel, M; Fischer, GW; Itzkovich, CJ; Eisenkraft, JB (July 2006). "Successful use of a 20% lipid emulsion to resuscitate a patient after a presumed bupivacaine-related cardiac arrest". Anesthesiology. 105 (1): 217–8. doi:10.1097/00000542-200607000-00033. PMID 16810015.
    18. Litz, RJ; Popp, M; Stehr, S N; Koch, T. (2006). "Successful resuscitation of a patient with ropivacaine-induced asystole after axillary plexus block using lipid infusion". Anaesthesia. 61 (8): 800–1. doi:10.1111/j.1365-2044.2006.04740.x. PMID 16867094.
    19. Picard, J; Meek, T (February 2006). "Lipid emulsion to treat overdose of local anaesthetic: the gift of the glob". Anaesthesia. 61 (2): 107–9. doi:10.1111/j.1365-2044.2005.04494.x. PMID 16430560.
    20. Gulihar, Abhinav; Robati, Shibby; Twaij, Haider; Salih, Alan; Taylor, Grahame J.S. (December 2015). "Articular cartilage and local anaesthetic: A systematic review of the current literature". Journal of Orthopaedics. 12 (Suppl 2): S200–S210. doi:10.1016/j.jor.2015.10.005. PMC 4796530. PMID 27047224.
    21. "bupivacaine hydrochloride (Bupivacaine Hydrochloride) injection, solution". FDA. Archived from the original on 21 April 2014. Retrieved 20 April 2014.
    22. Bupivacaine Effectiveness and Safety in SABER™ Trial (BESST); "Archived copy". Archived from the original on 2011-12-27. Retrieved 2012-03-01.CS1 maint: archived copy as title (link) ClinicalTrials.gov processed this record on February 29, 2012.
    This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.