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A Case Report of Venezuelan Suntiger Tarantula (Psalmopoeus Irminia) Envenomation and Review of Tarantula Exposures.
Journal of Emergency Medicine 2023 June 11
BACKGROUND: Tarantula envenomations are encountered infrequently but may increase with increased exotic animal ownership. This case report presents the first documented toxicity from a Venezuelan suntiger tarantula (VST), Psalmopoeus irminia, and provides a general framework for approaching patients with tarantula exposures.
CASE REPORT: A 35-year-old man presented to an emergency department 4 h after experiencing a bite from his pet VST. He developed erythema, pain, and edema to the bite site on the left thenar eminence that extended proximally. Within 4 h, he developed abdominal pain, nausea, vomiting, throat itching, and tightness. The patient had a blood pressure of 131/105 mm Hg, heart rate of 102 beats/min, 36.6°C, respiratory rate of 20 breaths/min, and SpO2 of 94%. Laboratory evaluations were within normal limits (other than chronically elevated but improved transaminases). The patient received 0.5 mg epinephrine intramuscularly, 50 mg diphenhydramine IV, 20 mg famotidine IV, 0.4 mg ondansetron IV, and 1 L of normal saline for a suspected anaphylactic reaction. Shortly after epinephrine administration, his gastrointestinal and upper airway symptoms resolved. All symptoms resolved within 1 week. WHY SHOULD AN EMERGENCY PHYSICIAN BE AWARE OF THIS?: Little is known about VST toxicity. Therefore, providers should rely on a general framework for approaching patients with tarantula exposures. Morbidity from tarantula exposures is mediated by mechanical injury, venom effects, and hypersensitivity reactions. Typical clinical findings include local pain, pruritis, edema, erythema, and burning. Muscle cramping, ophthalmia nodosa, and hypersensitivity reactions may occur. Treatment is primarily supportive and includes decontamination, cool compresses, analgesia, treatment of anaphylaxis, and ophthalmology evaluation if ocular exposure.
CASE REPORT: A 35-year-old man presented to an emergency department 4 h after experiencing a bite from his pet VST. He developed erythema, pain, and edema to the bite site on the left thenar eminence that extended proximally. Within 4 h, he developed abdominal pain, nausea, vomiting, throat itching, and tightness. The patient had a blood pressure of 131/105 mm Hg, heart rate of 102 beats/min, 36.6°C, respiratory rate of 20 breaths/min, and SpO2 of 94%. Laboratory evaluations were within normal limits (other than chronically elevated but improved transaminases). The patient received 0.5 mg epinephrine intramuscularly, 50 mg diphenhydramine IV, 20 mg famotidine IV, 0.4 mg ondansetron IV, and 1 L of normal saline for a suspected anaphylactic reaction. Shortly after epinephrine administration, his gastrointestinal and upper airway symptoms resolved. All symptoms resolved within 1 week. WHY SHOULD AN EMERGENCY PHYSICIAN BE AWARE OF THIS?: Little is known about VST toxicity. Therefore, providers should rely on a general framework for approaching patients with tarantula exposures. Morbidity from tarantula exposures is mediated by mechanical injury, venom effects, and hypersensitivity reactions. Typical clinical findings include local pain, pruritis, edema, erythema, and burning. Muscle cramping, ophthalmia nodosa, and hypersensitivity reactions may occur. Treatment is primarily supportive and includes decontamination, cool compresses, analgesia, treatment of anaphylaxis, and ophthalmology evaluation if ocular exposure.
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