Clinical toxicology : the official journal of the American Academy of Clinical Toxicology and European Association of Poisons Centres and Clinical Toxicologists
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Clin Toxicol (Phila) · May 2018
Case ReportsInverted Takotsubo syndrome in Androctonus australis scorpion envenomation.
The nature of scorpion-related cardiomyopathy is still a matter of debate where specific toxin-induced cardiomyopathy, ischemic, or catecholaminergic cardiomyopathy is advocated as well. We report two cases of Takotsubo syndrome following envenomation by Androctonus australis, bringing new evidence for the fundamental role of catecholamines in the pathogenesis of this cardiomyopathy. Case 1: A woman aged 36 presented with pulmonary edema and shock following scorpion envenomation. Echocardiography-Doppler showed a LVEF at 30%. Cardiac magnetic resonance (CMR) imaging showed a basal ballooning of the left and right ventricles suggestive of an inverted biventricular Takotsubo syndrome. A second CMR performed after recovery was normal. Case 2: A woman aged 45 was admitted for pulmonary edema and shock consecutive to scorpion envenomation. Echocardiography showed a LVEF at 35%. CMR showed a basal ballooning. The patient was discharged four days following admission with a normal LV function on repeat echocardiography examination. ⋯ Cardiomyopathy in these cases, following scorpion envenomation by Androctonus australis, fulfills the criteria of Takotsubo syndrome. These observations contribute to our understanding of the mechanism, prognosis, and treatment of scorpion-related cardiomyopathy.
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Clin Toxicol (Phila) · Apr 2018
Centruroides sculpturatus envenomation in three adult patients requiring treatment with antivenom.
Envenomation by Centruroides sculpturatus can manifest with cranial nerve dysfunction and neuromuscular hyperactivity. While these symptoms are most commonly seen in young children, they may also be seen in adults. ⋯ Severe Centruroides envenomation can occur in adults as well as children. These three cases demonstrate the usefulness, safety, and effectiveness of antivenom therapy to quickly relieve symptoms in adult patients with grades III & IV envenomations.
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Clin Toxicol (Phila) · Mar 2018
Analysis of an 8-hour acetylcysteine infusion protocol for repeated supratherapeutic ingestion (RSTI) of paracetamol.
In Australia, the treatment guideline for patients with repeated supratherapeutic ingestion (RSTI) of paracetamol recommends an abbreviated acetylcysteine regimen if the paracetamol concentration is low (<10 mg/L) and alanine aminotransferase (ALT) is normal or static after 8 hours of infusion. There are currently no studies of this recommendation. ⋯ An 8-hour acetylcysteine infusion regimen for treatment of paracetamol RSTI may be safe and is likely to reduce length of stay for patients at low risk of hepatotoxicity. Larger prospective studies are needed to examine the efficacy of this abbreviated acetylcysteine protocol.
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With increasing use of direct oral anticoagulants (DOACs), urgent reversal of these agents becomes a growing concern. Idarucizumab is a humanized monoclonal antibody fragment that specifically binds to dabigatran with higher affinity than thrombin, rapidly neutralizing its anticoagulant effect without increased risk of thrombosis. ⋯ These cases illustrate the potential for incomplete reversal of dabigatran with the recommended 5 g of idarucizumab and emphasize the importance of early detection of dabigatran toxicity. While direct dabigatran serum concentrations are not readily available, the INR may be a useful surrogate marker for supratherapeutic dabigatran concentrations.