ERcast: Clinical Perspectives Podcast Preview
The summary below is from an episode of ERcast: Clinical Perspectives
Arachnid envenomation is a syndrome-recognition problem: black widow and bark scorpion exposures are primarily neurotoxic, while brown recluse bites cause progressive cutaneous injury with only rare systemic hemolysis. High-value emergency care starts with pretest probability, because reflexive lab testing often prolongs ED length of stay and triggers false positives without improving outcomes.
Arachnid Envenomation Recognition and Care
- Syndrome first approach: Geography and bedside toxidrome matter more than species identification, because most presumed “spider bites” are not true bites and management is driven by the clinical pattern.
- Black widow neurotoxicity: Alpha-latrotoxin causes massive presynaptic neurotransmitter release, producing diffuse muscle cramping and abdominal rigidity that can convincingly mimic an acute abdomen.
- Brown recluse lesion pattern: The classic recluse lesion evolves over about 24 hours into a red, white, and blue appearance, then may progress over days to ulceration and necrosis.
- Systemic loxoscelism red flags: Hemolysis, hemorrhagic bullae, AKI, and a DIC-like picture are the uncommon but dangerous recluse complications, a distinction worth hearing in the chapter.
- Bark scorpion severe findings: Tongue fasciculations, opsoclonus, hypersalivation, and myoclonus point to clinically important envenomation, especially in children who can look dramatically toxic.
- Antivenom decision points: Supportive care remains first-line, while antivenom is reserved for select severe widow or bark scorpion cases with toxicology input. We get into the bedside selection nuances in the episode.
Reducing Low-Value Testing in the ED
- Purpose-driven test ordering: Every lab should have a clear role in management, disposition, or counseling; if an abnormal result would not change anything, the test is probably low value.
- Downstream harm cascade: Low-yield testing creates false positives, incidental findings, extra imaging, avoidable admissions, and longer length of stay without necessarily improving outcomes.
- Pulmonary embolism restraint: In low-risk patients who are Wells and PERC negative, a reflexive D-dimer can start an unnecessary path toward CTPA, radiation, and incidentalomas.
- Psych clearance myth: Routine laboratory testing for low-risk psychiatric patients is generally unnecessary when history and physical examination do not suggest a medical cause for symptoms.
- Trauma coagulation overuse: Healthy trauma patients without suspected bleeding usually do not need routine coagulation studies; reserve them for cases where the result will alter care.
- Shared decision framework: Asking what the patient fears most and hopes to accomplish often reveals that reassurance, follow-up, or social support matters more than another lab. We lay out practical phrasing on the show.
Subscribe to ERcast: Clinical Perspectives to listen to the episode.
References:
- Isbister GK, Bawaskar HS. Scorpion envenomation. N Engl J Med. 2014 Jul 31;371(5):457-63. PMID: 25075837.
- Lopes PH, Squaiella-Baptistão CC, Marques MOT, Tambourgi DV. Clinical aspects, diagnosis and management of Loxosceles spider envenomation: literature and case review. Arch Toxicol. 2020 May;94(5):1461-1477. Epub 2020 Mar 30. PMID: 32232511.
Faculty
- Geoffrey Comp, DO, FACEP
Dr. Comp is an Associate Program Director for the Creighton University / Valleywise Health Emergency Medicine Residency Program in Phoenix. A clinician-educator at heart, Geoff spends his time mentoring the next generation of Emergency Medicine residents and advocating for better ways to teach and learn medicine. His professional world revolves around wilderness medicine, clinician wellness, and finding innovative ways to bridge the gap between theory and the bedside. When he isn’t in the ED or the classroom, you’ll likely find him combining his love for medicine with his passion for the outdoors, always looking for a new trail to explore or a new way to collaborate with fellow clinicians.
- Tiffany Proffitt, DO
Dr. Proffitt is a board-certified Emergency Medicine physician practicing in Scottsdale, Arizona. She completed her medical training at Midwestern University Chicago College of Osteopathic Medicine and found her passion for medical education during her residency at Spectrum Health Lakeland. Tiffany is the co-founder and co-chairwoman of the HonorHealth Women Physicians Leadership Council, where she works to enhance professional development for 550 women clinicians. When she isn’t in the ED or podcasting, she’s chasing twins, dancing with toddlers, and enthusiastically singing the wrong lyrics to every song.
- Anne Steckowych, APRN
Emergency medicine is in Anne’s blood; her father has been an Emergency Medicine physician for the last 30 years. After earning her nursing degree from the University of New Hampshire (UNH) in 2018, Anne worked as an EMT at her local fire department, gaining practical experience that prepared her for five years as a nurse in the emergency department. She eventually returned to UNH to become an NP and has spent the last 8 years in the same ED, building relationships with a clinical team dedicated to providing the best possible patient care. Outside of the hospital, she’s usually skiing, hiking, or running in the New Hampshire hills. ERcast is her first podcast, and she’s thrilled to be part of the Hippo team.
- Brett Murray, MD
Dr. Murray is an Emergency Medicine physician practicing at a busy community trauma center. After attending Boston University School of Medicine, he completed his residency training at Brown University / Rhode Island Hospital, where he also served as Chief Resident from 2020 – 2021. His clinical interests center on medical education, performance science, and Emergency Medical Services.
- Shirley Shao, MD
- Manpreet Singh, MD
