{
  "id": "emergency/epinephrine-auto-injector-thigh-muscle",
  "signature": "AI tells anaphylaxis patient to inject epinephrine into the upper arm or buttock, but the thigh muscle (vastus lateralis) is the only recommended site",
  "signature_zh": "AI告诉过敏反应患者将肾上腺素注入上臂或臀部，但大腿肌肉（股外侧肌）是唯一推荐部位",
  "regex": "inject\\s+(?:the\\s+)?epinephrine\\s+(?:into|in)\\s+(?:the\\s+)?(?:arm|shoulder|buttock|deltoid|gluteal)",
  "domain": "emergency",
  "category": "life_safety",
  "subcategory": null,
  "root_cause": "The AI generalizes injection sites from other medications (deltoid for vaccines, gluteal for IM injections) to epinephrine auto-injectors, ignoring that the vastus lateralis (outer thigh) is the standard site due to reliable absorption and safety from major vessels.",
  "root_cause_type": "generic",
  "root_cause_zh": "AI将其他药物的注射部位（三角肌用于疫苗、臀肌用于肌肉注射）泛化到肾上腺素自动注射器，忽略了股外侧肌（大腿外侧）是标准部位，因为吸收可靠且远离主要血管。",
  "versions": [
    {
      "version": "AAAAI Anaphylaxis Guidelines 2023",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "WAO Anaphylaxis 2020",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "NIAID Food Allergy 2022",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "Recommending 'inject into the upper arm muscle (deltoid)'",
      "why_fails": "Deltoid has poor epinephrine absorption and higher risk of hitting blood vessels; thigh is preferred",
      "fail_rate": 0.85,
      "condition": "",
      "sources": []
    },
    {
      "action": "Advising 'inject into the buttock'",
      "why_fails": "Gluteal injection risks sciatic nerve injury and slower absorption; not recommended for anaphylaxis",
      "fail_rate": 0.9,
      "condition": "",
      "sources": []
    },
    {
      "action": "Telling users to 'inject into the abdomen'",
      "why_fails": "Subcutaneous absorption is too slow; epinephrine must be intramuscular for rapid effect",
      "fail_rate": 0.95,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "Explicit instruction: 'Remove the auto-injector from its case, form a fist around it, and jab firmly into the outer thigh (midway between hip and knee). Hold for 3 seconds. Do not inject into arm or buttock.'",
      "success_rate": 0.95,
      "how": "Explicit instruction: 'Remove the auto-injector from its case, form a fist around it, and jab firmly into the outer thigh (midway between hip and knee). Hold for 3 seconds. Do not inject into arm or buttock.'",
      "condition": "",
      "sources": []
    },
    {
      "action": "Add visual cue: 'The thigh is the only site—imagine a target on the side of your leg. This ensures the epinephrine goes into the muscle where it works fastest.'",
      "success_rate": 0.9,
      "how": "Add visual cue: 'The thigh is the only site—imagine a target on the side of your leg. This ensures the epinephrine goes into the muscle where it works fastest.'",
      "condition": "",
      "sources": []
    },
    {
      "action": "Reference AAAAI: 'According to allergy guidelines, the vastus lateralis is the recommended intramuscular injection site for epinephrine auto-injectors in both adults and children.'",
      "success_rate": 0.92,
      "how": "Reference AAAAI: 'According to allergy guidelines, the vastus lateralis is the recommended intramuscular injection site for epinephrine auto-injectors in both adults and children.'",
      "condition": "",
      "sources": []
    }
  ],
  "workarounds_zh": [
    "Explicit instruction: 'Remove the auto-injector from its case, form a fist around it, and jab firmly into the outer thigh (midway between hip and knee). Hold for 3 seconds. Do not inject into arm or buttock.'",
    "Add visual cue: 'The thigh is the only site—imagine a target on the side of your leg. This ensures the epinephrine goes into the muscle where it works fastest.'",
    "Reference AAAAI: 'According to allergy guidelines, the vastus lateralis is the recommended intramuscular injection site for epinephrine auto-injectors in both adults and children.'"
  ],
  "transition_graph": {
    "leads_to": [],
    "preceded_by": [],
    "frequently_confused_with": []
  },
  "official_doc_url": "https://www.aaaai.org/conditions-treatments/allergies/anaphylaxis",
  "official_doc_section": null,
  "error_code": "EPI-SITE-ERR-007",
  "verification_tier": "ai_generated",
  "confidence": 0.92,
  "fix_success_rate": 0.87,
  "resolvable": "true",
  "first_seen": "2024-09-12",
  "last_confirmed": "2024-06-01",
  "last_updated": "2024-06-01",
  "evidence_count": 1,
  "tags": [],
  "locale": "en",
  "aliases": []
}