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Adel B, Elgharbawy NM, Shahin MM, Abo-Elfadl AA, Saad KM. Insulin-euglycemia therapy in acute aluminum phosphide poisoning: a randomized clinical trial. Clin Toxicol (Phila) 2023; 61:1032-1039. [PMID: 38096041 DOI: 10.1080/15563650.2023.2279495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2023] [Accepted: 10/31/2023] [Indexed: 01/26/2024]
Abstract
Introduction: Aluminum phosphide is a pesticide that is used in developing countries. Aluminum phosphide poisoning has a high mortality rate and there is no known antidote. This study aimed to evaluate the safety and efficacy of insulin-euglycemia therapy in the management of patients with acute aluminum phosphide poisoning.Methods: This trial was prospectively registered in the Pan African Clinical Trials Registry (PACTR202008534546951). A total of 108 patients were randomly allocated to two groups. The intervention group received insulin-euglycemia therapy in addition to standard treatment (norepinephrine and supportive care); the control group received standard treatment plus placebo. The main outcome measures were survival, blood pressure, and laboratory investigations.Results: The two groups had similar baseline parameters. Insulin-euglycemia therapy was associated with a significant reduction in mortality compared with that in the control group (64.8 percent and 96.3 percent, respectively; P value <0.001). Patients randomized to insulin-euglycemia also required lower doses of vasopressors (median was 7 mg versus 26 mg in control group; P value 0.006) and fewer patients needed intubation (61.1 percent versus 81.5 percent in the control group; P value 0.019). Insulin-euglycemia therapy significantly improved blood pressure (systolic, diastolic, and mean arterial pressure) (median at 6h post-admission was 80 mmHg, 55 mmHg and 65 mmHg compared with 20 mmHg, 10 mmHg and 13 mmHg in the control group respectively; P value <0.001) and bicarbonate and lactate concentrations.Conclusion: Insulin-euglycemia therapy appears to be a safe and effective treatment option for patients with aluminum phosphide poisoning. Vasopressor only therapy was associated with very poor outcomes in acute aluminum phosphide poisoning.
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Affiliation(s)
- Basma Adel
- Department of Forensic Medicine and Clinical Toxicology, Tanta University, Tanta, Egypt
| | | | - Marwa Mohamed Shahin
- Department of Forensic Medicine and Clinical Toxicology, Tanta University, Tanta, Egypt
| | - Arwa Ahmed Abo-Elfadl
- Department of Forensic Medicine and Clinical Toxicology, Tanta University, Tanta, Egypt
| | - Khaled Mahmoud Saad
- Department of Forensic Medicine and Clinical Toxicology, Tanta University, Tanta, Egypt
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Tinsman AE, Bellis TJ. Hyperinsulinemia/euglycemia and intravenous lipid emulsion therapy for the management of severe amlodipine toxicosis in a cat. Clin Case Rep 2021; 9:e05175. [PMID: 34934496 PMCID: PMC8650752 DOI: 10.1002/ccr3.5175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Revised: 09/23/2021] [Accepted: 11/04/2021] [Indexed: 11/29/2022] Open
Abstract
Calcium-channel blockers (CCBs) are widely used in people and animals. Overdose can result in cardiovascular collapse and death. Hyperinsulinemia/euglycemia therapy (HIET) and intralipid therapy (ILT) are reported treatment options in people. This is the first report describing HIET and ILT as treatments for amlodipine toxicosis in a cat.
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Affiliation(s)
| | - Tara J. Bellis
- Emergency & Critical CareGarden State Veterinary ServicesIselinNJUSA
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Corcoran JN, Jacoby KJ, Olives TD, Bangh SA, Cole JB. Persistent Hyperinsulinemia Following High-Dose Insulin Therapy: A Case Report. J Med Toxicol 2020; 16:465-469. [PMID: 32656624 DOI: 10.1007/s13181-020-00796-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Revised: 06/23/2020] [Accepted: 06/24/2020] [Indexed: 12/01/2022] Open
Abstract
INTRODUCTION Overdoses of beta-adrenergic antagonists and calcium channel antagonists represent an uncommonly encountered but highly morbid clinical presentation. Potential therapies include fluids, calcium salts, vasopressors, intravenous lipid emulsion, methylene blue, and high-dose insulin. Although high-dose insulin is commonly used, the kinetics of insulin under these conditions are unknown. CASE REPORT We present a case of a 51-year-old male who sustained a life-threatening overdose after ingesting approximately 40 tablets of a mixture of amlodipine 5 mg and metoprolol tartrate 25 mg. Due to severe bradycardia and hypotension, he was started on high-dose insulin (HDI) therapy; this was augmented with epinephrine. Despite the degree of his initial shock state, he ultimately recovered, and HDI was discontinued. Insulin was infused for a total of approximately 37 hours, most of which was dosed at 10 U/kg/hour; following discontinuation, serial serum insulin levels were drawn and remained at supraphysiologic levels for at least 24 hours and well above reference range for multiple days thereafter. CONCLUSION The kinetics of insulin following discontinuation of high-dose insulin therapy are largely unknown, but supraphysiologic insulin levels persist for some time following therapy; this may allow for simple discontinuation rather than titration of insulin at the end of therapy. Dextrose replacement is frequently needed; although the duration is often difficult to predict, prolonged infusions may not be necessary.
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Affiliation(s)
- Justin N Corcoran
- Minnesota Poison Control System, 701 Park Ave RL.240, Minneapolis, MN, 55415, USA.
| | | | - Travis D Olives
- Minnesota Poison Control System, 701 Park Ave RL.240, Minneapolis, MN, 55415, USA
| | - Stacey A Bangh
- Minnesota Poison Control System, 701 Park Ave RL.240, Minneapolis, MN, 55415, USA
| | - Jon B Cole
- Minnesota Poison Control System, 701 Park Ave RL.240, Minneapolis, MN, 55415, USA
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Rotella JA, Greene SL, Koutsogiannis Z, Graudins A, Hung Leang Y, Kuan K, Baxter H, Bourke E, Wong A. Treatment for beta-blocker poisoning: a systematic review. Clin Toxicol (Phila) 2020; 58:943-983. [DOI: 10.1080/15563650.2020.1752918] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Joe-Anthony Rotella
- Victorian Poisons Information Centre, Austin Health, Victoria, Australia
- Department of Emergency Medicine, Northern Health, Epping, Victoria
| | - Shaun L. Greene
- Victorian Poisons Information Centre, Austin Health, Victoria, Australia
- Department of Medicine, Faculty of Medicine, University of Melbourne, Victoria, Australia
| | - Zeff Koutsogiannis
- Victorian Poisons Information Centre, Austin Health, Victoria, Australia
- Department of Emergency Medicine, Northern Health, Epping, Victoria
| | - Andis Graudins
- Victorian Poisons Information Centre, Austin Health, Victoria, Australia
- Monash Toxicology and Emergency Department, Monash Health, Victoria, Australia
- Department of Medicine, School of Clinical Sciences at Monash Health, Monash University, Victoria, Australia
| | - Yit Hung Leang
- Victorian Poisons Information Centre, Austin Health, Victoria, Australia
| | - Kelvin Kuan
- Department of Emergency Medicine, Changi General Hospital, Singapore, Singapore
| | - Helen Baxter
- Austin Health Library, Austin Health, Victoria, Australia
| | - Elyssia Bourke
- Victorian Poisons Information Centre, Austin Health, Victoria, Australia
| | - Anselm Wong
- Victorian Poisons Information Centre, Austin Health, Victoria, Australia
- Department of Medicine, School of Clinical Sciences at Monash Health, Monash University, Victoria, Australia
- Department of Medicine and Radiology, Centre for Integrated Critical Care, Melbourne Medical School, University of Melbourne, Victoria, Australia
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Chad T, Ulla M, Garnelo Rey V, Gómez C. High-Dose Insulin for Toxin Induced Cardiogenic Shock: Experience at a New High and Overview of the Evidence. J Emerg Med 2020; 58:317-323. [PMID: 31761461 DOI: 10.1016/j.jemermed.2019.10.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2019] [Revised: 10/01/2019] [Accepted: 10/13/2019] [Indexed: 06/10/2023]
Abstract
BACKGROUND High-dose insulin therapy is an effective treatment for cardiogenic shock caused by the overdose of particular medications. Other treatment options are usually of limited benefit. Consensus suggests that early initiation improves efficacy. No ceiling effect has been established at doses in the general range of 0.5-10 units/kg/hour. CASE REPORT A 79-year-old man presented in cardiogenic shock after an intentional overdose of numerous cardioactive medications 10 days after experiencing myocardial infarction. A high-dose insulin infusion was commenced. This was titrated up to a maximum of 20 units/kg/hour (1600 units/hour) and sustained for 32 h (61,334 units total). Minimal adverse events were seen despite this exceptional infusion rate (3 episodes of hypoglycemia and 2 episodes of hypokalemia). Concurrent catecholamine support was used, and cardiovascular function was maintained until all support was withdrawn 5 days after admission. WHY SHOULD AN EMERGENCY PHYSICIAN BE AWARE OF THIS?: Emergency physicians are pivotal to the successful initiation/up-titration of high-dose insulin therapy. They must balance the potential for treatment failure with other treatment options, mitigate against adverse events in the initial phase of therapy, and coordinate care between other hospital specialties. This case shows that the relative safety and efficacy was extended to an infusion rate of 20 units/kg/hour, the highest recorded in the published literature. This information may help guide treatment of similar cases in the future.
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Affiliation(s)
- Thomas Chad
- Adult Intensive Care Unit, St. Mary's Hospital, Imperial College Healthcare National Health Service Trust, London, United Kingdom
| | - Marco Ulla
- Adult Intensive Care Unit, St. Mary's Hospital, Imperial College Healthcare National Health Service Trust, London, United Kingdom
| | - Vanesa Garnelo Rey
- Adult Intensive Care Unit, St. Mary's Hospital, Imperial College Healthcare National Health Service Trust, London, United Kingdom
| | - Carlos Gómez
- Adult Intensive Care Unit, St. Mary's Hospital, Imperial College Healthcare National Health Service Trust, London, United Kingdom
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Use of a Porcine Model to Evaluate the Risks and Benefits of Vasopressors in Propranolol Poisoning. J Med Toxicol 2020; 16:212-221. [PMID: 31981076 DOI: 10.1007/s13181-020-00758-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Revised: 12/18/2019] [Accepted: 01/05/2020] [Indexed: 10/25/2022] Open
Abstract
INTRODUCTION Vasopressors are a commonly used treatment in beta-blocker poisoning despite evidence they may be ineffective or harmful. The primary objective of the present study is to use previously collected data from two prior studies (high-dose insulin (HDI) versus vasopressin + epinephrine and a placebo-controlled HDI study) to compare survival between vasopressin + epinephrine and placebo. Secondary outcomes included a comparison with HDI as well as comparisons with hemodynamic parameters, including mean arterial pressure (MAP), cardiac output (CO), heart rate (HR), and systemic vascular resistance (SVR). METHODS Cardiogenic shock was induced in healthy pigs with a bolus of 0.5 mg/kg of intravenous propranolol followed by an infusion of 0.25 mg/kg/minute until the point of toxicity, defined as (0.75 × initial HR × initial MAP), at which point the infusion was reduced to 0.125 mg/kg/minute for 240 (vasopressin + epinephrine or HDI) or 360 minutes (placebo) or until death. RESULTS Survival was significantly lower in pigs receiving vasopressin + epinephrine (0%, 0/5) than in pigs receiving placebo (50%, 2/4) (p < 0.01). Survival was significantly higher with HDI compared with both groups (100%, 5/5) (p < 0.01). All vasopressin + epinephrine pigs died within 100 minutes after reaching toxicity. Over the course of the resuscitation, we observed a statistically significant steady decrease in CO and HR in the vasopressin + epinephrine group compared with placebo (p < 0.01). In contrast, we observed a statistically significant change in MAP and SVR that followed a parabolic arc, with MAP and SVR rising significantly initially in the vasopressin + epinephrine group then rapidly falling until death (p < 0.01). CONCLUSIONS Mortality was higher with vasopressors compared with placebo in this porcine model of propranolol poisoning. Further studies are warranted to define the optimal timing and role of vasopressors in beta-blocker poisoning.
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Boley SP, Mackenzie RB, LeRoy JM, Engebretsen KM, Stellpflug SJ. Development and Feasibility of a Porcine Model of Amlodipine Toxicity. J Med Toxicol 2019; 16:61-66. [PMID: 31385194 DOI: 10.1007/s13181-019-00721-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2019] [Revised: 07/12/2019] [Accepted: 07/12/2019] [Indexed: 11/26/2022] Open
Abstract
INTRODUCTION Toxicity related to calcium-channel blockers remains a significant cause of morbidity and mortality. Amlodipine-induced shock is unique in that its mechanism of action is thought to occur in part via the release of nitric oxide (NO) in the peripheral vasculature. Specific therapeutic interventions, including methylene blue (an NO scavenger), have been suggested, but efficacy studies are severely limited. To facilitate a larger porcine study into the effect of various interventions on amlodipine toxicity, we undertook this model development and feasibility study. METHODS Intravenous amlodipine was prepared by dissolving commercially obtained amlodipine tablets in dimethylsulfoxide. The concentration of the drug was verified using ultraviolet spectroscopy. We administered this solution to three animals in order to determine a toxic dose, capable of facilitating a two-arm study of amlodipine toxicity. RESULTS The first pig died rapidly after the bolus infusion. The second pig developed mild toxicity, but the dissolution of the plastic tubing by the solvent and subsequent leakage limited the interpretability of the result. The third animal developed expected toxicity with an infusion rate between 2.0 and 5.5 mg/kg/h. CONCLUSION This study demonstrates a potentially repeatable model of amlodipine-induced toxic shock using intravenous administration of amlodipine and several methodological considerations for researchers undertaking similar work.
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Affiliation(s)
- Sean P Boley
- Department of Emergency Medicine, United Hospital, St. Paul, MN, USA
| | | | - Jenna M LeRoy
- Department of Emergency Medicine, Regions Hospital, St. Paul, MN, USA
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Lauterbach M. Clinical toxicology of beta-blocker overdose in adults. Basic Clin Pharmacol Toxicol 2019; 125:178-186. [PMID: 30916882 DOI: 10.1111/bcpt.13231] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Accepted: 02/22/2019] [Indexed: 11/28/2022]
Abstract
Beta-blocker overdose is potentially harmful due to the strong blood pressure-lowering and heart rate-lowering effects. However, conflicting data exist as to their differential toxicity, single-substance exposures and the effect of co-exposure with additional antihypertensive medication. For this, a 10-year retrospective, explorative analysis of the Mainz Poison Center/Germany database with regard to circumstances of beta-blocker exposure, doses, symptoms and treatment was carried out. Analyses were restricted to adult patients with single-substance exposures and co-exposures with one additional antihypertensive substance. Written follow-up information was obtained in half the cases. A total of 2967 cases were analysed, of which 697 were single-substance exposures. Metoprolol was most frequently reported followed by bisoprolol, atenolol, propranolol and sotalol. Metoprolol showed a linear dose-symptom relationship, whereas propranolol and sotalol seemed to have a threshold dose beyond which symptoms aggravated. Symptoms did not differ substantially, except for more seizures being reported with propranolol, and more CNS depression/vomiting with sotalol. Activated charcoal was used in 38%, gastric lavage in 11%, temporary pacemaker in 3%, glucagon in 1%, intubation for respiratory insufficiency and cardiopulmonary resuscitation in 1% and 0.5%. All patients recovered. In 174 co-exposure cases, the distribution of poisoning severity and rate of worsening of symptoms was comparable with single-substance exposures except one patient deceased after bisoprolol and verapamil co-exposure. In adults with beta-blocker overdose, no significant differences in poisoning severity among beta-blockers were detected, and no fatalities were observed with single-substance exposures. Co-exposures with other antihypertensives, sedatives or alcohol should be carefully attended to as fatalities might occur.
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Affiliation(s)
- Michael Lauterbach
- Mainz Poison Center, Mainz, Germany.,Barmherzige Brueder Hospital, Trier, Germany
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11
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Orozco BS, Engebretsen KM, Holger JS, Stellpflug SJ. A Swine Model of Severe Propranolol Toxicity Permitting Direct Measurement of Brain Tissue Oxygenation. J Med Toxicol 2019; 15:178-183. [PMID: 30895518 DOI: 10.1007/s13181-019-00707-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2018] [Revised: 03/06/2019] [Accepted: 03/06/2019] [Indexed: 12/12/2022] Open
Abstract
INTRODUCTION High-dose insulin (HDI) therapy has been used successfully for beta-blocker toxicity, but needs further study when hypotension persists despite HDI. The objective was to develop a model of propranolol toxicity with persistent hypotension despite HDI and to develop means to measure cerebral oxygen tension (PbrO2). METHODS Eight anesthetized Yorkshire pigs were instrumented with a tracheostomy, Swan-Ganz catheter, arterial catheter, and intra-cerebral pressure and oxygen monitor. Intravenous propranolol was given until the initial point of toxicity (POT); 25% reduction from baseline mean arterial pressure (MAP) × heart rate (HR). At the initial POT, normal saline (NS) bolus and infusion along with HDI infusion were started. The propranolol infusion was titrated up slowly to induce hypotension. Group 2 pigs received a norepinephrine (NE) infusion after a secondary POT defined as a MAP < 50 mmHg. NE was titrated to maintain subsequent MAPs > 50 mmHg. Cardiac output, HR, MAP, PbrO2, and intracranial pressure were then recorded every 5 min until death or 4 h. Systemic vascular resistance, potassium, and glucose were also measured. Surviving pigs were euthanized. RESULTS Two pigs received unique doses for protocol development. One pig developed a tachyarrhythmia prior to protocol, one failed to reach secondary POT, leaving 2 pigs in each group reaching secondary POT. The range of PbrO2 recordings for group 1 was 12.7-48.5 mmHg and 9.2-26.2 mmHg for group 2. CONCLUSION We report a pilot study swine model of propranolol toxicity with hypotension despite HDI, in which physiologic measures including PbrO2 are achieved. Our toxicity model can be used in the future, and the hemodynamic and brain monitoring model may prove important for subsequent research in various contexts.
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Affiliation(s)
| | - Kristin M Engebretsen
- Department of Emergency Medicine, Regions Hospital, 640 Jackson St., St. Paul, MN, 55101, USA
| | - Joel S Holger
- Department of Emergency Medicine, Regions Hospital, 640 Jackson St., St. Paul, MN, 55101, USA
| | - Samuel J Stellpflug
- Department of Emergency Medicine, Regions Hospital, 640 Jackson St., St. Paul, MN, 55101, USA.
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Katzung KG, Leroy JM, Boley SP, Stellpflug SJ, Holger JS, Engebretsen KM. A randomized controlled study comparing high-dose insulin to vasopressors or combination therapy in a porcine model of refractory propranolol-induced cardiogenic shock. Clin Toxicol (Phila) 2019; 57:1073-1079. [PMID: 30806099 DOI: 10.1080/15563650.2019.1580372] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Context: Although cerebral perfusion (CP) is preserved across a wide range of mean arterial pressures (MAP) through cerebral-vascular autoregulation, the relationship between MAP and CP in refractory poison-induced cardiogenic shock (PICS) has never been studied. We compared the effects of therapies used in PICS: high-dose insulin (HDI), HDI plus norepinephrine (NE), and vasopressors alone (NE plus epinephrine (Epi)) on cerebral tissue oxygenation (PtO2). Methods: Fifteen swine were randomized to either HDI, HDI + NE, or NE + Epi. All animals received a propranolol infusion using an established model of toxicity. At primary toxicity (P1), defined as a 25% reduction in heart rate (HR) multiplied by MAP, the HDI and HDI + NE groups received HDI and the NE + Epi group received NE. Once a sustained MAP < 55 mmHg was reached (P2), the HDI group received saline (NS), the HDI + NE group received NE and the NE + Epi group received Epi until death or censoring. PtO2 and hemodynamic parameters including MAP, cardiac output (CO) and central venous pressure (CVP) were measured every 10 minutes. Glucose and potassium were measured at predetermined intervals. Results: Animals treated with HDI + NE maintained PtO2 over time more than the HDI-alone group. Due to rapid hemodynamic collapse, we were unable to analyze PtO2 data in the vasopressor only animals. Mean survival time was 1.9, 2.9 and 0.1 hours for the HDI, HDI + NE and NE + Epi groups, respectively. Survival time from P2 (sustained MAP <55 mmHg) to death or censoring was not different between HDI and HDI + NE groups. Conclusions: HDI + NE treatment was superior to HDI-alone at preserving PtO2 when MAP < 55 mmHg. We were unable to compare the PtO2 between the NE + Epi to the HDI or HDI + NE due to rapid decline in CO and death. If MAP is sustained at < 55 mmHg after maximizing HDI, adjunctive treatment with NE should be considered to preserve PtO2.
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Affiliation(s)
- Katherine G Katzung
- Department of Emergency Medicine, Abbott Northwestern Hospital , Minneapolis , MN , USA
| | - Jenna M Leroy
- Department of Emergency Medicine, Regions Hospital , St. Paul , MN , USA
| | - Sean P Boley
- Department of Emergency Medicine, United Hospital , St. Paul , MN , USA
| | | | - Joel S Holger
- Department of Emergency Medicine, Regions Hospital , St. Paul , MN , USA
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Krenz JR, Kaakeh Y. An Overview of Hyperinsulinemic-Euglycemic Therapy in Calcium Channel Blocker and β-blocker Overdose. Pharmacotherapy 2018; 38:1130-1142. [PMID: 30141827 DOI: 10.1002/phar.2177] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- James R. Krenz
- Purdue University College of Pharmacy; West Lafayette Indiana
| | - Yaman Kaakeh
- Purdue University College of Pharmacy; West Lafayette Indiana
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Cole JB, Arens AM, Laes JR, Klein LR, Bangh SA, Olives TD. High dose insulin for beta-blocker and calcium channel-blocker poisoning. Am J Emerg Med 2018; 36:1817-1824. [DOI: 10.1016/j.ajem.2018.02.004] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Revised: 01/31/2018] [Accepted: 02/04/2018] [Indexed: 02/06/2023] Open
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Bartlett D. β-Blocker and Calcium Channel Blocker Poisoning: High-Dose Insulin/Glucose Therapy. Crit Care Nurse 2018; 36:45-50. [PMID: 27037338 DOI: 10.4037/ccn2016370] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
Overdoses of β-blockers and calcium channel blockers can produce significant morbidity and mortality, and conventional therapies often do not work as treatments for these poisonings. High-dose insulin/glucose therapy has been successful in reversing the cardiotoxic effects of these drugs in cases where the standard therapies have failed, and it appears to be relatively safe. Many successes have been well documented, but the clinical experience consists of case reports, the mechanisms of action are not completely understood, and guidelines for use of the therapy are empirically derived and not standardized. Regardless of these limitations, high-dose insulin/glucose therapy can be effective, it is often recommended by clinical toxicologists and poison control centers, and critical care nurses should be familiar with when and how the therapy is used.
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Affiliation(s)
- Dana Bartlett
- Dana Bartlett is an information specialist at the Connecticut Poison Control Center, Farmington, Connecticut.
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Page CB, Ryan NM, Isbister GK. The safety of high-dose insulin euglycaemia therapy in toxin-induced cardiac toxicity. Clin Toxicol (Phila) 2017; 56:389-396. [DOI: 10.1080/15563650.2017.1391391] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Colin B. Page
- Clinical Toxicology Research Group, University of Newcastle, Newcastle, Australia
- School of Medicine, University of Queensland, Brisbane, Australia
- Department of Clinical Toxicology and Pharmacology, Calvary Mater Newcastle, Newcastle, Australia
| | - Nicole M. Ryan
- Clinical Toxicology Research Group, University of Newcastle, Newcastle, Australia
| | - Geoffrey K. Isbister
- Clinical Toxicology Research Group, University of Newcastle, Newcastle, Australia
- Department of Clinical Toxicology and Pharmacology, Calvary Mater Newcastle, Newcastle, Australia
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Baker KA, Austin EB, Wang GS. Antidotes: Familiar Friends and New Approaches for the Treatment of Select Pediatric Toxicological Exposures. CLINICAL PEDIATRIC EMERGENCY MEDICINE 2017. [DOI: 10.1016/j.cpem.2017.07.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Abstract
OBJECTIVE Overdoses with cardio-depressive medications can result in toxin-induced cardiogenic shock (TICS), a life-threatening condition characterized by severe hypotension and ineffective tissue perfusion. Vasopressors are often employed in the treatment of shock to increase heart rate and blood pressure. We sought to conduct a systematic review of the literature to evaluate the effectiveness of vasopressors in improving hemodynamic function and survival in the treatment of TICS. DATA SOURCES We searched PubMed, EMBASE, TOXLINE, and International Pharmaceutical Abstracts. STUDY SELECTION We included studies evaluating the use of vasopressors in humans or animals with TICS. We limited human study types to randomized controlled trials, clinical trials, observational studies, and case reports. DATA EXTRACTION Our search yielded 913 citations and 144 of these met our inclusion criteria. 130 were human case reports and 14 were animal studies. DATA SYNTHESIS Human case report data showed vasopressors were ineffective more often than they were partially or fully effective. In the majority of animal studies, vasopressor treatment failed to improve hemodynamic parameters and resulted in decreased survival. CONCLUSIONS Human case reports and controlled animal experiments lead to different conclusions about vasopressors in TICS. Most animal studies indicate that vasopressors impair hemodynamic function and increase mortality. In contrast, human case reports suggest that vasopressors are often ineffective but not necessarily harmful.
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Affiliation(s)
- Cassandra A Skoog
- a College of Pharmacy, University of Minnesota , Minneapolis , MN , USA
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Murphy CM, Williams C, Quinn ME, Nicholson B, Shoe T, Beuhler MC, Kerns WP. Pilot Trial of Intravenous Lipid Emulsion Treatment for Severe Nifedipine-Induced Shock. J Med Toxicol 2016; 12:380-385. [PMID: 27501853 DOI: 10.1007/s13181-016-0572-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2016] [Revised: 07/02/2016] [Accepted: 07/06/2016] [Indexed: 11/24/2022] Open
Abstract
Animal studies and human case reports show promise in using lipid rescue to treat refractory calcium channel antagonist toxicity. However, the majority of research and clinical experience has focused on non-dihydropyridine agents. Thus, we sought to investigate the value of lipid emulsion (ILE) therapy for dihydropyridine-induced shock. This IACUC-approved study utilized seven swine that were sedated with alpha-chloralose, mechanically ventilated, and instrumented for drug delivery and hemodynamic measures. After stabilization and basal measures, nifedipine (0.01875 mg/kg/min) was infused until imminent cardiac arrest (seizure, end tidal CO2 < 10 mmHg, bradydysrhythmia, or pulseless electrical activity). Animals then received a 7 mL/kg bolus of 20% lipid emulsion via central catheter. Lipid circulation was visually confirmed by the presence of fat in peripheral arterial blood. Hemodynamics were continuously monitored until 10 min after lipid bolus. Surviving animals were euthanized. Pre- and post-lipid treatment parameters were analyzed using the Wilxocon signed rank test (p <0.05 significant). Nifedipine toxicity was characterized by vasodilatory hypotension, impaired vascular contractility, and tachycardia with terminal bradycardia. The median time to imminent cardiac arrest from start of nifedipine infusion was 218 min. Lipid treatment did not improve hemodynamics or restore circulation in any animal. There was no benefit from lipid rescue in this model of nifedipine toxicity. Further study of ILE for dihydropyridine toxicity is warranted but initial animal model results are not promising.
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Affiliation(s)
- Christine M Murphy
- Department of Emergency Medicine, Division of Medical Toxicology, Carolinas Medical Center, Charlotte, NC, USA.
| | - Cliff Williams
- Department of Emergency Medicine, Division of Research, Carolinas Medical Center, Charlotte, NC, USA
| | - Michael E Quinn
- Department of Comparative Medicine, Carolinas Medical Center, Charlotte, NC, USA
| | - Brian Nicholson
- Department of Comparative Medicine, Carolinas Medical Center, Charlotte, NC, USA
| | - Thomas Shoe
- United States Army Medical Research Institute of Infectious Diseases (USAMRIID), Frederick, MD, USA
| | | | - William P Kerns
- Department of Emergency Medicine, Division of Medical Toxicology, Carolinas Medical Center, Charlotte, NC, USA
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Laskey D, Vadlapatla R, Hart K. Stability of high-dose insulin in normal saline bags for treatment of calcium channel blocker and beta blocker overdose. Clin Toxicol (Phila) 2016; 54:829-832. [PMID: 27432286 DOI: 10.1080/15563650.2016.1209766] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
CONTEXT High-dose insulin has become a first-line therapy for treating severe calcium channel blocker and beta blocker toxicity. Insulin infusions used to treat other conditions (e.g., diabetic ketoacidosis) may be used, but this may lead to pulmonary compromise due to fluid volume overload. An obvious solution would be to use a more concentrated insulin infusion; however, data describing the stability of insulin in polyvinyl chloride bags at concentrations >1 unit/mL are not readily available. OBJECTIVE To determine the stability of insulin at 16 units/mL in 0.9% saline solution. MATERIALS AND METHODS Eight-hundred units of regular insulin (8 mL from a stock vial containing 100 units/mL) were added to 42 mL of 0.9% saline solution in a polyvinyl chloride bag to make a final concentration of 16 units/mL. Two bags were stored at 4 °C (refrigerated) and two at 25 °C (room temperature). Samples were withdrawn and tested for insulin concentration periodically over 14 days. RESULTS Concentrated regular insulin in a polyvinyl chloride bag remained within 90% of equilibrium concentration at all time points, indicating the 16 units/mL concentration was sufficiently stable both refrigerated and at room temperature for 14 days. DISCUSSION Administration of high-dose insulin can cause fluid volume overload when using traditional insulin formulations. The 16 units/mL concentration allows for the treatment of a patient with severe calcium channel blocker or beta blocker toxicity for a reasonable period of time without administering excessive fluid. CONCLUSION Insulin at a concentration of 16 units/mL is stable for 14 days, the maximum timeframe currently allowed under US Pharmacopeia rules for compounding of sterile preparations. This stability data will allow institutions to issue beyond-use dating for intravenous fluids containing concentrated insulin and used for treating beta blocker and calcium channel blocker toxicity.
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Affiliation(s)
- Dayne Laskey
- a University of Saint Joseph School of Pharmacy , Hartford , CT , USA
| | - Rajesh Vadlapatla
- b Marshall B. Ketchum University College of Pharmacy , Fullerton , CA , USA
| | - Katherine Hart
- c Hartford Hospital , Hartford , CT , USA.,d Connecticut Poison Control Center , Farmington , CT , USA
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21
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Karthik R, Prasad H, Seetharam AK, Murali Mohan NT, Trimurthy G, Wali S. Successful use of high-dose insulin therapy in atenolol overdose refractory to conventional management. J Emerg Trauma Shock 2015; 8:242-3. [PMID: 26604536 PMCID: PMC4626947 DOI: 10.4103/0974-2700.161662] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Affiliation(s)
- Ravikanti Karthik
- Department of Emergency Medicine, Vydehi Institute of Medical Sciences and Research Centre, Bengaluru, Karnataka, India E-mail:
| | - Hari Prasad
- Department of Emergency Medicine, Vydehi Institute of Medical Sciences and Research Centre, Bengaluru, Karnataka, India E-mail:
| | - A K Seetharam
- Department of Emergency Medicine, Vydehi Institute of Medical Sciences and Research Centre, Bengaluru, Karnataka, India E-mail:
| | - N T Murali Mohan
- Department of Emergency Medicine, Vydehi Institute of Medical Sciences and Research Centre, Bengaluru, Karnataka, India E-mail:
| | - Gaganam Trimurthy
- Department of Emergency Medicine, Vydehi Institute of Medical Sciences and Research Centre, Bengaluru, Karnataka, India E-mail:
| | - Siddraj Wali
- Department of Emergency Medicine, Vydehi Institute of Medical Sciences and Research Centre, Bengaluru, Karnataka, India E-mail:
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23
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Graudins A, Lee HM, Druda D. Calcium channel antagonist and beta-blocker overdose: antidotes and adjunct therapies. Br J Clin Pharmacol 2015; 81:453-61. [PMID: 26344579 DOI: 10.1111/bcp.12763] [Citation(s) in RCA: 76] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2015] [Revised: 08/25/2015] [Accepted: 08/26/2015] [Indexed: 12/26/2022] Open
Abstract
Management of cardiovascular instability resulting from calcium channel antagonist (CCB) or beta-adrenergic receptor antagonist (BB) poisoning follows similar principles. Significant myocardial depression, bradycardia and hypotension result in both cases. CCBs can also produce vasodilatory shock. Additionally, CCBs, such as verapamil and diltiazem, are commonly ingested in sustained-release formulations. This can also be the case for some BBs. Peak toxicity can be delayed by several hours. Provision of early gastrointestinal decontamination with activated charcoal and whole-bowel irrigation might mitigate this. Treatment of shock requires a multimodal approach to inotropic therapy that can be guided by echocardiographic or invasive haemodynamic assessment of myocardial function. High-dose insulin euglycaemia is commonly recommended as a first-line treatment in these poisonings, to improve myocardial contractility, and should be instituted early when myocardial dysfunction is suspected. Catecholamine infusions are complementary to this therapy for both inotropic and chronotropic support. Catecholamine vasopressors and vasopressin are used in the treatment of vasodilatory shock. Optimizing serum calcium concentration can confer some benefit to improving myocardial function and vascular tone after CCB poisoning. High-dose glucagon infusions have provided moderate chronotropic and inotropic benefits in BB poisoning. Phosphodiesterase inhibitors and levosimendan have positive inotropic effects but also produce peripheral vasodilation, which can limit blood pressure improvement. In cases of severe cardiogenic shock and/or cardiac arrest post-poisoning, extracorporeal cardiac assist devices have resulted in successful recovery. Other treatments used in refractory hypotension include intravenous lipid emulsion for lipophilic CCB and BB poisoning and methylene blue for refractory vasodilatory shock.
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Affiliation(s)
- Andis Graudins
- Monash Health Clinical Toxicology and Addiction Medicine Service, Monash Health, Dandenong Hospital, David Street, Dandenong, VIC, 3175, Australia.,Monash Emergency Program, Monash Health, Dandenong Hospital, David Street, Dandenong, VIC, 3175, Australia.,School of Clinical Sciences at Monash Health, Faculty of Medicine, Nursing and Health Sciences, Monash University, Monash Medical Centre, Clayton, VIC, 3168, Australia
| | - Hwee Min Lee
- Monash Health Clinical Toxicology and Addiction Medicine Service, Monash Health, Dandenong Hospital, David Street, Dandenong, VIC, 3175, Australia.,Monash Emergency Program, Monash Health, Dandenong Hospital, David Street, Dandenong, VIC, 3175, Australia.,School of Clinical Sciences at Monash Health, Faculty of Medicine, Nursing and Health Sciences, Monash University, Monash Medical Centre, Clayton, VIC, 3168, Australia
| | - Dino Druda
- Monash Health Clinical Toxicology and Addiction Medicine Service, Monash Health, Dandenong Hospital, David Street, Dandenong, VIC, 3175, Australia.,Monash Emergency Program, Monash Health, Dandenong Hospital, David Street, Dandenong, VIC, 3175, Australia
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24
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Truhlář A, Deakin CD, Soar J, Khalifa GEA, Alfonzo A, Bierens JJLM, Brattebø G, Brugger H, Dunning J, Hunyadi-Antičević S, Koster RW, Lockey DJ, Lott C, Paal P, Perkins GD, Sandroni C, Thies KC, Zideman DA, Nolan JP, Böttiger BW, Georgiou M, Handley AJ, Lindner T, Midwinter MJ, Monsieurs KG, Wetsch WA. European Resuscitation Council Guidelines for Resuscitation 2015: Section 4. Cardiac arrest in special circumstances. Resuscitation 2015; 95:148-201. [PMID: 26477412 DOI: 10.1016/j.resuscitation.2015.07.017] [Citation(s) in RCA: 537] [Impact Index Per Article: 59.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Anatolij Truhlář
- Emergency Medical Services of the Hradec Králové Region, Hradec Králové, Czech Republic; Department of Anaesthesiology and Intensive Care Medicine, University Hospital Hradec Králové, Hradec Králové, Czech Republic.
| | - Charles D Deakin
- Cardiac Anaesthesia and Cardiac Intensive Care, NIHR Southampton Respiratory Biomedical Research Unit, Southampton University Hospital NHS Trust, Southampton, UK
| | - Jasmeet Soar
- Anaesthesia and Intensive Care Medicine, Southmead Hospital, North Bristol NHS Trust, Bristol, UK
| | | | - Annette Alfonzo
- Departments of Renal and Internal Medicine, Victoria Hospital, Kirkcaldy, Fife, UK
| | | | - Guttorm Brattebø
- Bergen Emergency Medical Services, Department of Anaesthesia and Intensive Care, Haukeland University Hospital, Bergen, Norway
| | - Hermann Brugger
- EURAC Institute of Mountain Emergency Medicine, Bozen, Italy
| | - Joel Dunning
- Department of Cardiothoracic Surgery, James Cook University Hospital, Middlesbrough, UK
| | | | - Rudolph W Koster
- Department of Cardiology, Academic Medical Center, Amsterdam, The Netherlands
| | - David J Lockey
- Intensive Care Medicine and Anaesthesia, Southmead Hospital, North Bristol NHS Trust, Bristol, UK; School of Clinical Sciences, University of Bristol, UK
| | - Carsten Lott
- Department of Anesthesiology, University Medical Center, Johannes Gutenberg-Universitaet, Mainz, Germany
| | - Peter Paal
- Barts Heart Centre, St Bartholomew's Hospital, Barts Health NHS Trust, Queen Mary University of London, London, UK; Department of Anaesthesiology and Critical Care Medicine, University Hospital Innsbruck, Austria
| | - Gavin D Perkins
- Warwick Medical School, University of Warwick, Coventry, UK; Critical Care Unit, Heart of England NHS Foundation Trust, Birmingham, UK
| | - Claudio Sandroni
- Department of Anaesthesiology and Intensive Care, Catholic University School of Medicine, Rome, Italy
| | | | - David A Zideman
- Department of Anaesthetics, Imperial College Healthcare NHS Trust, London, UK
| | - Jerry P Nolan
- Anaesthesia and Intensive Care Medicine, Royal United Hospital, Bath, UK; School of Clinical Sciences, University of Bristol, UK
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Woodward C, Pourmand A, Mazer-Amirshahi M. High dose insulin therapy, an evidence based approach to beta blocker/calcium channel blocker toxicity. ACTA ACUST UNITED AC 2014; 22:36. [PMID: 24713415 PMCID: PMC3985540 DOI: 10.1186/2008-2231-22-36] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2014] [Accepted: 03/26/2014] [Indexed: 11/10/2022]
Abstract
Poison-induced cardiogenic shock (PICS) as a result of beta-blocker (β-blocker) or calcium channel blocker (CCB) overdose is a common and potentially life-threatening condition. Conventional therapies, including fluid resuscitation, atropine, cardiac pacing, calcium, glucagon, and vasopressors often fail to improve hemodynamic status. High-dose insulin (HDI) is an emerging therapeutic modality for PICS. In this article, we discuss the existing literature and highlight the therapeutic success and potential of HDI. Based on the current literature, which is limited primarily to case series and animal models, the authors conclude that HDI can be effective in restoring hemodynamic stability, and recommend considering its use in patients with PICS that is not responsive to traditional therapies. Future studies should be undertaken to determine the optimal dose and duration of therapy for HDI in PICS.
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Affiliation(s)
| | - Ali Pourmand
- Department of Emergency Medicine, George Washington University, Washington, DC 20037, USA.
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26
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Holger JS, Engebretsen KM, Stellpflug SJ, Cole JB, Kerns W. Critical care management of verapamil and diltiazem overdose with a focus on vasopressors: a 25-year experience at a single center. Ann Emerg Med 2014; 63:91-2. [PMID: 24355375 DOI: 10.1016/j.annemergmed.2013.10.036] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2013] [Revised: 10/11/2013] [Accepted: 10/14/2013] [Indexed: 10/25/2022]
Affiliation(s)
| | | | | | - Jon B Cole
- Hennepin County Medical Center, Minneapolis, MN
| | - William Kerns
- Carolinas Medical Center Emergency Department, Charlotte, NC
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27
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Maton BL, Simmonds EE, Lee JA, Alwood AJ. The use of high-dose insulin therapy and intravenous lipid emulsion to treat severe, refractory diltiazem toxicosis in a dog. J Vet Emerg Crit Care (San Antonio) 2013; 23:321-7. [PMID: 23656275 DOI: 10.1111/vec.12053] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2011] [Accepted: 03/28/2013] [Indexed: 11/29/2022]
Affiliation(s)
| | - Erin E. Simmonds
- Guardian Veterinary Centre; 5620 99; th; Street; Edmonton; AB; T6E 1V2; Canada
| | - Justine A. Lee
- Pet Poison Helpline; 3600 American Boulevard West, Suite 770; Bloomington; MN; 55431
| | - Amy J. Alwood
- VCA Boston Road Animal Hospital; 1235 Boston Road; Springfield; MA; 01119
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28
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Cole JB, Stellpflug SJ, Ellsworth H, Anderson CP, Adams AB, Engebretsen KM, Holger JS. A blinded, randomized, controlled trial of three doses of high-dose insulin in poison-induced cardiogenic shock. Clin Toxicol (Phila) 2013; 51:201-7. [DOI: 10.3109/15563650.2013.770152] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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29
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Toxic bradycardias in the critically ill poisoned patient. Emerg Med Int 2012; 2012:852051. [PMID: 22545217 PMCID: PMC3321542 DOI: 10.1155/2012/852051] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2011] [Revised: 11/15/2011] [Accepted: 01/18/2012] [Indexed: 11/17/2022] Open
Abstract
Cardiovascular drugs are a common cause of poisoning, and toxic bradycardias can be refractory to standard ACLS protocols. It is important to consider appropriate antidotes and adjunctive therapies in the care of the poisoned patient in order to maximize outcomes. While rigorous studies are lacking in regards to treatment of toxic bradycardias, there are small studies and case reports to help guide clinicians' choices in caring for the poisoned patient. Antidotes, pressor support, and extracorporeal therapy are some of the treatment options for the care of these patients. It is important to make informed therapeutic decisions with an understanding of the available evidence, and consultation with a toxicologist and/or regional Poison Control Center should be considered early in the course of treatment.
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Stellpflug SJ, Fritzlar SJ, Cole JB, Engebretsen KM, Holger JS. Cardiotoxic overdose treated with intravenous fat emulsion and high-dose insulin in the setting of hypertrophic cardiomyopathy. J Med Toxicol 2011; 7:151-3. [PMID: 21174185 DOI: 10.1007/s13181-010-0133-3] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
High-dose insulin (HDI) and intravenous fat emulsion (IFE) are used in overdoses, although rarely combined. To our knowledge, IFE therapy has not been reported in overdoses of diltiazem, metoprolol and amiodarone. We report a severe overdose of these drugs treated with HDI and IFE in a patient with hypertrophic cardiomyopathy (HCM). We also discuss the potential clinical implications of the inotropic effects of HDI in the setting of HCM and the use and efficacy of IFE in this overdose.
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Affiliation(s)
- Samuel J Stellpflug
- Clinical Toxicology Service and Department of Emergency Medicine, Regions Hospital, 640 Jackson Street, St. Paul, MN 55101, USA.
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31
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Holger JS, Stellpflug SJ, Cole JB, Harris CR, Engebretsen KM. High-dose insulin: A consecutive case series in toxin-induced cardiogenic shock. Clin Toxicol (Phila) 2011; 49:653-8. [DOI: 10.3109/15563650.2011.593522] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Engebretsen KM, Kaczmarek KM, Morgan J, Holger JS. High-dose insulin therapy in beta-blocker and calcium channel-blocker poisoning. Clin Toxicol (Phila) 2011; 49:277-83. [DOI: 10.3109/15563650.2011.582471] [Citation(s) in RCA: 156] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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33
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Soar J, Perkins GD, Abbas G, Alfonzo A, Barelli A, Bierens JJLM, Brugger H, Deakin CD, Dunning J, Georgiou M, Handley AJ, Lockey DJ, Paal P, Sandroni C, Thies KC, Zideman DA, Nolan JP. European Resuscitation Council Guidelines for Resuscitation 2010 Section 8. Cardiac arrest in special circumstances: Electrolyte abnormalities, poisoning, drowning, accidental hypothermia, hyperthermia, asthma, anaphylaxis, cardiac surgery, trauma, pregnancy, electrocution. Resuscitation 2011; 81:1400-33. [PMID: 20956045 DOI: 10.1016/j.resuscitation.2010.08.015] [Citation(s) in RCA: 362] [Impact Index Per Article: 27.8] [Reference Citation Analysis] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Jasmeet Soar
- Anaesthesia and Intensive Care Medicine, Southmead Hospital, North Bristol NHS Trust, Bristol, UK.
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Browne A, Harvey M, Cave G. Intravenous lipid emulsion does not augment blood pressure recovery in a rabbit model of metoprolol toxicity. J Med Toxicol 2011; 6:373-8. [PMID: 20354918 DOI: 10.1007/s13181-010-0049-y] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Intravenous lipid emulsion (ILE) has been demonstrated to be an effective treatment for systemic toxicity associated with local anaesthetics and increasingly non-local anaesthetic agents of high lipophilicity. Effect for ILE has been demonstrated in animal models of propranolol poisoning; however, any benefit for ILE in more hydrophilic β-blockers remains uncertain. We determined to examine the effect of ILE on haemodynamic recovery following induction of hypotension with the relatively hydrophilic β-blocker, metoprolol. Twenty sedated, invasively monitored and mechanically ventilated adult New Zealand white rabbits underwent metoprolol infusion to mean arterial pressure (MAP) 60% baseline. Intravenous rescue was given according to the following groups: 6 mL/kg 20% lipid emulsion or 6 mL/kg 0.9% saline solution over 4 min. Haemodynamic parameters were obtained in 15 min. MAP was 70 (interquartile range (IQR), 58-82) mmHg saline group and 79 (IQR, 72-89) mmHg ILE group at baseline, and 38 (IQR, 33-40) mmHg saline group and 41 (IQR, 40-43) mmHg ILE group, respectively, following metoprolol infusion. No statistically significant difference between ILE and saline-treated groups was observed in MAP, or pulse rate, at any time point following rescue therapy. ILE was not effective in reversal of metoprolol-induced hypotension in this rabbit model. These findings lend inferential support for the 'lipid sink' as principal mechanism for the beneficial effect observed with ILE administration in other models of lipophilic β-blocker-induced toxicity.
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Affiliation(s)
- Alexander Browne
- Emergency Medicine Registrar, Christchurch Hospital, Riccarton Road, Christchurch, New Zealand
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Insulin versus Lipid Emulsion in a Rabbit Model of Severe Propranolol Toxicity: A Pilot Study. Crit Care Res Pract 2011; 2011:361737. [PMID: 21541209 PMCID: PMC3085310 DOI: 10.1155/2011/361737] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2010] [Accepted: 02/05/2011] [Indexed: 11/26/2022] Open
Abstract
Background and objective. Beta-blocker overdose may result in intractable cardiovascular collapse despite conventional antidotal treatments. High dose insulin/glucose (ING), and more recently intravenous lipid emulsion (ILE), have been proposed as potentially beneficial therapies in beta blocker intoxication. We compare efficacy of the novel antidotes ING, with ILE, in a rabbit model of combined enteric/intravenous propranolol toxicity.
Methods. Sedated, mechanically ventilated and invasively monitored New Zealand White rabbits underwent mini-laparotomy and enterostomy formation with 40 mg/kg propranolol instilled into the proximal small bowel. At 30 minutes propranolol infusion was commenced at 4 mg/kg/hr and continued to a target mean arterial pressure (MAP) of 50% baseline MAP. Animals were resuscitated with insulin at 3 U/kg plus 0.5 g/kg glucose (ING group), or 10 mL/kg 20% Intralipid (ILE group).
Results. Rate pressure product (RPP; RPP = heart rate × mean arterial pressure) was greatest in the ING group at 60 minutes (P < .05). A trend toward greater heart rate was observed in the ING group (P = .06). No difference was observed in survival between groups (4/5 ING versus 2/5 ILE; P = .524).
Conclusions. High dose insulin resulted in greater rate pressure product compared with lipid emulsion in this rabbit model of severe enteric/intravenous propranolol toxicity.
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Abstract
Clinicians are frequently confronted with toxicological emergencies and challenged with the task of correctly identifying the possible agents involved and providing appropriate treatments. In this review article, we describe the epidemiology of overdoses, provide a practical approach to the recognition and diagnosis of classic toxidromes, and discuss the initial management strategies that should be considered in all overdoses. In addition, we evaluate some of the most common agents involved in poisonings and present their respective treatments. Recognition of toxidromes with knowledge of indications for antidotes and their limitations for treating overdoses is crucial for the acute care of poisoned patients.
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Affiliation(s)
- Simon W Lam
- Cleveland Clinic, Department of Pharmacy, Cleveland, OH 44195, USA.
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37
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Deakin CD, Morrison LJ, Morley PT, Callaway CW, Kerber RE, Kronick SL, Lavonas EJ, Link MS, Neumar RW, Otto CW, Parr M, Shuster M, Sunde K, Peberdy MA, Tang W, Hoek TLV, Böttiger BW, Drajer S, Lim SH, Nolan JP. Part 8: Advanced life support: 2010 International Consensus on Cardiopulmonary Resuscitation and Emergency Cardiovascular Care Science with Treatment Recommendations. Resuscitation 2011; 81 Suppl 1:e93-e174. [PMID: 20956032 DOI: 10.1016/j.resuscitation.2010.08.027] [Citation(s) in RCA: 167] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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Vanden Hoek TL, Morrison LJ, Shuster M, Donnino M, Sinz E, Lavonas EJ, Jeejeebhoy FM, Gabrielli A. Part 12: cardiac arrest in special situations: 2010 American Heart Association Guidelines for Cardiopulmonary Resuscitation and Emergency Cardiovascular Care. Circulation 2010; 122:S829-61. [PMID: 20956228 DOI: 10.1161/circulationaha.110.971069] [Citation(s) in RCA: 392] [Impact Index Per Article: 28.0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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40
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Engebretsen KM, Morgan MW, Stellpflug SJ, Cole JB, Anderson CP, Holger JS. Addition of phenylephrine to high-dose insulin in dihydropyridine overdose does not improve outcome. Clin Toxicol (Phila) 2010; 48:806-12. [PMID: 20969502 DOI: 10.3109/15563650.2010.521753] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
INTRODUCTION Vasopressors are commonly used for calcium channel blocker (CCB)-induced cardiogenic shock after calcium and high-dose insulin (HDI). Vasopressor therapy is frequently used in combination with HDI to increase blood pressure and improve outcome. However, no studies have compared the efficacy of HDI to the combination of a vasopressor and HDI in dihydropyridine overdose. We conducted a study to compare the efficacy of HDI to phenylephrine (PE) plus HDI in a porcine model of dihydropyridine toxicity. METHODS Cardiogenic shock was induced by administering a nifedipine (NP) infusion of 0.0125 mcg/kg/min until a point of toxicity, defined as a 25% decrease in the baseline product of mean arterial pressure (MAP) × cardiac output (CO). Each arm was resuscitated with 20 mL/kg of saline (NS). The nifedipine infusion continued throughout a 4-h resuscitation protocol. The HDI group was titrated up to 10 units/kg/h of insulin and the HDI/PE group was titrated up to a dose of HDI 10 units/kg/h plus PE 3.6 mcg/kg/min. RESULTS No baseline differences were found among groups including time to toxicity. Survival was not different between the HDI and HDI/PE arms. When comparing the HDI to the HDI/PE arm no differences were found for cardiac index (CI) (p = 0.06), systemic vascular resistance (p = 0.34), heart rate (HR) (p = 0.95), mean arterial pressure (p = 0.99), pulmonary vascular resistance (PVR) (p = 0.07), or base excess (p = 0.36). CONCLUSION In this model of nifedipine-induced cardiogenic shock, the addition of PE to HDI therapy did not improve mortality, cardiac output, blood pressure, systemic vascular resistance (SVR), or base excess.
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Morrison LJ, Deakin CD, Morley PT, Callaway CW, Kerber RE, Kronick SL, Lavonas EJ, Link MS, Neumar RW, Otto CW, Parr M, Shuster M, Sunde K, Peberdy MA, Tang W, Hoek TLV, Böttiger BW, Drajer S, Lim SH, Nolan JP, Adrie C, Alhelail M, Battu P, Behringer W, Berkow L, Bernstein RA, Bhayani SS, Bigham B, Boyd J, Brenner B, Bruder E, Brugger H, Cash IL, Castrén M, Cocchi M, Comadira G, Crewdson K, Czekajlo MS, Davies SR, Dhindsa H, Diercks D, Dine CJ, Dioszeghy C, Donnino M, Dunning J, El Sanadi N, Farley H, Fenici P, Feeser VR, Foster JA, Friberg H, Fries M, Garcia-Vega FJ, Geocadin RG, Georgiou M, Ghuman J, Givens M, Graham C, Greer DM, Halperin HR, Hanson A, Holzer M, Hunt EA, Ishikawa M, Ioannides M, Jeejeebhoy FM, Jennings PA, Kano H, Kern KB, Kette F, Kudenchuk PJ, Kupas D, La Torre G, Larabee TM, Leary M, Litell J, Little CM, Lobel D, Mader TJ, McCarthy JJ, McCrory MC, Menegazzi JJ, Meurer WJ, Middleton PM, Mottram AR, Navarese EP, Nguyen T, Ong M, Padkin A, Ferreira de Paiva E, Passman RS, Pellis T, Picard JJ, Prout R, Pytte M, Reid RD, Rittenberger J, Ross W, Rubertsson S, Rundgren M, Russo SG, Sakamoto T, Sandroni C, Sanna T, Sato T, Sattur S, Scapigliati A, Schilling R, Seppelt I, Severyn FA, Shepherd G, Shih RD, Skrifvars M, Soar J, Tada K, Tararan S, Torbey M, Weinstock J, Wenzel V, Wiese CH, Wu D, Zelop CM, Zideman D, Zimmerman JL. Part 8: Advanced Life Support. Circulation 2010; 122:S345-421. [DOI: 10.1161/circulationaha.110.971051] [Citation(s) in RCA: 250] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Holger JS, Dries DJ, Barringer KW, Peake BJ, Flottemesch TJ, Marini JJ. Cardiovascular and metabolic effects of high-dose insulin in a porcine septic shock model. Acad Emerg Med 2010; 17:429-35. [PMID: 20370783 DOI: 10.1111/j.1553-2712.2010.00695.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
OBJECTIVES High-dose insulin (HDI) has inotropic and vasodilatory properties in various clinical conditions associated with myocardial depression. The authors hypothesized that HDI will improve the myocardial depression produced by severe septic shock and have beneficial effects on metabolic parameters. In an animal model of severe septic shock, this study compared the effects of HDI treatment to normal saline (NS) resuscitation alone. METHODS Ten pigs were randomized to an insulin (HDI) or NS group. All were anesthetized and instrumented to monitor cardiovascular function. In both arms, Escherichia coli endotoxin lipopolysaccharide (LPS) and NS infusions were begun. LPS was titrated to 20 mug/kg/hour over 30 minutes and continued for 5 hours, and saline was infused at 20 mL/kg/hour throughout the protocol. Dextrose (50%) was infused to maintain glucose in the 60-150 mg/dL range, and potassium was infused to maintain a level greater than 2.8 mmol/L. At 60 minutes, the HDI group received an insulin infusion titrated from 2 to 10 units/kg/hour over 40 minutes and continued at that rate throughout the protocol. Survival, heart rate (HR), mean arterial pressure (MAP), pulmonary artery and central venous pressure, cardiac output, central venous oxygen saturation (SVO(2)), and lactate were monitored for 5 hours (three pigs each arm) or 7 hours (two pigs each arm) or until death. Cardiac index, systemic vascular resistance (SVR), pulmonary vascular resistance (PVR), O(2) delivery, and O(2) consumption were derived from measured data. Outcomes from the repeated-measures analysis were modeled using a mixed-effects linear model that assumed normally distributed errors and a random effect at the subject level. RESULTS No significant baseline differences existed between arms at time 0 or 60 minutes. Survival was 100% in the HDI arm and 60% in the NS arm. Cardiovascular variables were significantly better in the HDI arm: cardiac index (p < 0.001), SVR (p < 0.003), and PVR (p < 0.01). The metabolic parameters were also significantly better in the HDI arm: SVO(2) (p < 0.01), O(2) delivery (p < 0.001), and O(2) consumption (p < 0.001). No differences in MAP, HR, or lactate were found. CONCLUSIONS In this animal model of endotoxemic-induced septic shock that results in severe myocardial depression, HDI is associated with improved cardiac function compared to NS resuscitation alone. HDI also demonstrated favorable metabolic, pulmonary, and peripheral vascular effects. Further studies may define a potential role for the use of HDI in the resuscitation of septic shock.
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Affiliation(s)
- Joel S Holger
- Department of Emergency Medicine, Regions Hospital, St. Paul, MN, USA.
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Stellpflug SJ, Harris CR, Engebretsen KM, Cole JB, Holger JS. Intentional overdose with cardiac arrest treated with intravenous fat emulsion and high-dose insulin. Clin Toxicol (Phila) 2010; 48:227-9. [DOI: 10.3109/15563650903555294] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Abstract
The treatment of patients poisoned with drugs and pharmaceuticals can be quite challenging. Diverse exposure circumstances, varied clinical presentations, unique patient-specific factors, and inconsistent diagnostic and therapeutic infrastructure support, coupled with relatively few definitive antidotes, may complicate evaluation and management. The historical approach to poisoned patients (patient arousal, toxin elimination, and toxin identification) has given way to rigorous attention to the fundamental aspects of basic life support--airway management, oxygenation and ventilation, circulatory competence, thermoregulation, and substrate availability. Selected patients may benefit from methods to alter toxin pharmacokinetics to minimize systemic, target organ, or tissue compartment exposure (either by decreasing absorption or increasing elimination). These may include syrup of ipecac, orogastric lavage, activated single- or multi-dose charcoal, whole bowel irrigation, endoscopy and surgery, urinary alkalinization, saline diuresis, or extracorporeal methods (hemodialysis, charcoal hemoperfusion, continuous venovenous hemofiltration, and exchange transfusion). Pharmaceutical adjuncts and antidotes may be useful in toxicant-induced hyperthermias. In the context of analgesic, anti-inflammatory, anticholinergic, anticonvulsant, antihyperglycemic, antimicrobial, antineoplastic, cardiovascular, opioid, or sedative-hypnotic agents overdose, N-acetylcysteine, physostigmine, L-carnitine, dextrose, octreotide, pyridoxine, dexrazoxane, leucovorin, glucarpidase, atropine, calcium, digoxin-specific antibody fragments, glucagon, high-dose insulin euglycemia therapy, lipid emulsion, magnesium, sodium bicarbonate, naloxone, and flumazenil are specifically reviewed. In summary, patients generally benefit from aggressive support of vital functions, careful history and physical examination, specific laboratory analyses, a thoughtful consideration of the risks and benefits of decontamination and enhanced elimination, and the use of specific antidotes where warranted. Data supporting antidotes effectiveness vary considerably. Clinicians are encouraged to utilize consultation with regional poison centers or those with toxicology training to assist with diagnosis, management, and administration of antidotes, particularly in unfamiliar cases.
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Affiliation(s)
- Silas W Smith
- New York City Poison Control Center, New York University School of Medicine, New York, USA.
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Nickson CP, Little M. Early use of high-dose insulin euglycaemic therapy for verapamil toxicity. Med J Aust 2009; 191:350-2. [PMID: 19769561 DOI: 10.5694/j.1326-5377.2009.tb02822.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2009] [Accepted: 07/28/2009] [Indexed: 11/17/2022]
Abstract
A 49-year-old man presented with verapamil toxicity complicated by hypotension and a junctional rhythm, in the context of deliberate self-poisoning with multiple drugs. The patient's hypotension normalised following the early use of high-dose insulin euglycaemic therapy (HIET), without the need for additional vasopressors; it recurred when HIET was prematurely stopped, and again stabilised when HIET was recommenced. Consideration should be given to the early use of HIET in treating severe calcium channel blocker toxicity, rather than as a last resort after other therapies have failed.
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Page C, Hacket LP, Isbister GK. The use of high-dose insulin-glucose euglycemia in beta-blocker overdose: a case report. J Med Toxicol 2009; 5:139-43. [PMID: 19655287 DOI: 10.1007/bf03161225] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
The management of life-threatening beta-blocker toxicity and its associated low cardiac output state is clinically challenging. Previous case reports and case series describe the use of hyperinsulinemia/euglycemia therapy in mono-ingestions of calcium channel blockers and mixed ingestions, including calcium channel and beta-blockers. In this case report we describe the use of high-dose insulin (10 IU/kg per hour) in a case of massive metoprolol ingestion (5g) in which hypotension was unresponsive to conventional therapies. Although the metoprolol concentrations measured in plasma were approximately 100-200 times therapeutic concentrations, the pharmacokinetics appeared to be similar to therapeutic metoprolol dosing.
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Affiliation(s)
- Colin Page
- Department of Clinical Toxicology and Pharmacology, Calvary Mater Newcastle Hospital, Newcastle, NSW, Australia.
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Ablorh NA, Nitu F, Engebretsen K, Thomas DD, Holger JS. Insulin-dependent rescue from cardiogenic shock is not mediated by phospholamban phosphorylation. Clin Toxicol (Phila) 2009; 47:296-302. [PMID: 19365773 DOI: 10.1080/15563650902870269] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
INTRODUCTION We used immunoblots to determine whether inotropic and lusitropic effects of high-dose insulin (HDI) in cardiogenic shock, induced by a beta-blocker (BB) or a calcium channel blocker (CCB), are mediated by phosphorylation of phospholamban (PLB). PLB is a membrane protein that regulates calcium uptake into the sarcoplasmic reticulum (SR) by inhibition of the cardiac calcium pump (SERCA2a). Phosphorylation of PLB relieves SERCA inhibition, thus enhancing diastolic relaxation and preload. METHODS Our Institutional Animal Care and Use Committee approved this research. Swine myocardia from six groups were flash frozen immediately upon death or sacrifice. Groups 1-6 received: (1) no medications, (2) HDI and glucose only, (3) toxic propranolol infusions and saline resuscitation, (4) toxic propranolol infusions and HDI resuscitation, (5) toxic verapamil infusions and saline resuscitation, and (6) toxic verapamil infusions and HDI resuscitation. Groups 3-6 were resuscitated for 4 h. Tissue samples from all six groups were analyzed by quantitative immunoblots, using antibodies to both unphosphorylated PLB (uPLB) and phosphorylated PLB (pPLB), to determine the total PLB content and the fraction of PLB phosphorylated. RESULTS There were no differences in either pPLB or total PLB in cardiac tissue among any of the six groups. However, infusion of a pig with the beta-adrenergic agonist, isoproterenol, produced enhanced PLB phosphorylation. CONCLUSION The mechanism by which HDI produces its inotropic and lusitropic effects in CCB- and BB-induced cardiovascular toxicity, resulting in resuscitation, is not due to changes in phosphorylation of PLB or a change in the total PLB in the SR.
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Affiliation(s)
- Naa-Adjeley Ablorh
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, MN 55101, USA
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Holger JS, Engebretsen KM, Marini JJ. High dose insulin in toxic cardiogenic shock. Clin Toxicol (Phila) 2009; 47:303-7. [DOI: 10.1080/15563650802701929] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Harvey MG, Cave GR. Intralipid infusion ameliorates propranolol-induced hypotension in rabbits. J Med Toxicol 2008; 4:71-6. [PMID: 18570165 DOI: 10.1007/bf03160958] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
Abstract
OBJECTIVE Recent case reports of successful amelioration of lipid-soluble drug toxidromes with Intralipid infusion have prompted interest in the scope of lipid emulsions as antidotal therapy. Propranolol is a highly lipid-soluble, nonselective beta-blocker with additional local-anaesthetic properties. We explored the hypothesis that propranolol toxicity may be similarly attenuated by Intralipid infusion in a rabbit model. METHODS Twenty sedated, invasively monitored, and mechanically ventilated New Zealand White rabbits underwent propranolol infusion at 4.2 mg/min to a target mean arterial pressure (MAP) of 60% baseline MAP. Animals subsequently received 6 ml/kg 20% Intralipid, or 6 ml/kg 0.9% saline solution over a 4-minute period. Pulse rate and MAP were recorded at 2.5-minute intervals to 15 minutes. RESULTS MAP was greatest in the Intralipid group (median 69 mmHg, interquartile range [IQR] 17.5 mmHg Intralipid vs. median 53 mmHg, IQR 12.75 mmHg saline; p=0.029) at 15 minutes. No difference was observed in first derivative of MAP, or pulse rate between groups. CONCLUSIONS Propranolol-induced hypotension is ameliorated by Intralipid infusion in this intact rabbit model. The mechanism of action remains to be elucidated.
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Affiliation(s)
- Martyn G Harvey
- Department of Emergency Medicine, Waikato Hospital, Hamilton, New Zealand.
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