7 A 58-year-old male received a spinal block with bupivacaine forĪrthroscopic repair of a torn rotator cuff. The first use of lipid emulsion to resuscitate a patient following cardiac arrest occurred in 2006 by Dr. Weinberg’s dose-response research was ongoing and his suggested dosages were provided in a “to the editor” response letter. 6 Though, at the time of these suggestions, Dr. Weinberg suggested an infusion of 20% lipid emulsion, at a rate of 0.25 mL/kg/min be used until the patient has stable hemodynamics. 6 Following resumption of normal sinus rhythm, Dr. Weinberg suggested that in humans where resuscitation due to LAST is required, a 1 mL/kg bolus of 20% lipid emulsion over 1 minute be used and repeated every 3-5 minus to a maximum of 3 mL/kg. 4 His hypothesis was that lipid emulsion forms a “lipid sink”, a lipid phase that extracts the lipid-soluble anesthetic molecules from the body’s plasma. 4,5 Furthermore, he demonstrated that lipid infusion during resuscitation from bupivacaine-induced cardiac arrest in dogs improved survival. Guy Weinberg first suggested lipid emulsion can be used for treatment of local anesthesia toxicity when he observed that intravenous lipid infusion increases the dosage of bupivacaine required to cause asystole in both rats and dogs. 1 Patients receive slow lipid infusion over a 12- to 24-hour period as a caloric and fatty acid source. 2 Lipid emulsion is used predominately in the medical field for patients in the intensive care unit who suffer from malnutrition. 1 It consists of egg phospholipids, soybean oil, and glycerin. Lipid emulsion is offered commercially as Intralipid 10% or 20% which as been available since 1962. 1,2 However, despite the widespread use of local anesthetics by dental practitioners, over half of surveyed dentists are unaware of lipid emulsion treatment for LAST and fewer then 2% know how to use it. 1 Lipid emulsion has been recognised as a life-saving treatment for LAST and has been applied to medical anesthesia guidelines since 2010. 1 At high concentrations, circulatory collapse and asystole can occur and cardiac resuscitation is required. CNS depression with loss of consciousness and seizures, are the most common characteristics of LAST. 1 The life-threatening complications are due to effects on the central nervous system (CNS) and cardiovascular system (CVS) through depression of electrical conduction. The signs and symptoms of LAST can appear immediately after injection if injected directly into a blood vessel or delayed if the anesthetic is absorbed from the tissue at the site of injection. Local anesthetics are used by dentists extensively and when used erroneously, such as intravenously or above the maximum dose, life-threatening local anesthetic systemic toxicity (LAST) can result.
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