{
  "id": "medical/central-line-blood-culture-contamination",
  "signature": "AI instructs to draw blood cultures exclusively from a central venous catheter without peripheral venipuncture, ignoring contamination risk",
  "signature_zh": "AI指示仅从中心静脉导管抽取血培养而不进行外周静脉穿刺，忽略污染风险",
  "regex": "(?i)(draw.*blood culture.*(central line|central venous|PICC|port-a-cath).*(without|only|exclusively).*(peripheral|venipuncture))",
  "domain": "medical",
  "category": "runtime_error",
  "subcategory": null,
  "root_cause": "Blood cultures drawn solely from a central line have a 2-5x higher contamination rate than peripheral draws, leading to false positives, unnecessary antibiotics, and increased line-days; paired peripheral and central cultures are required for accurate diagnosis of catheter-related bloodstream infection.",
  "root_cause_type": "generic",
  "root_cause_zh": "仅从中心静脉导管抽取血培养的污染率是外周抽血的2-5倍，导致假阳性、不必要的抗生素使用和延长导管留置时间；需要同时抽取外周和中心培养才能准确诊断导管相关血流感染。",
  "versions": [],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "Use a larger volume (20 mL) from the central line to dilute any contaminants",
      "why_fails": "Contamination arises from skin flora at the catheter hub, not from low volume; larger volume does not reduce contamination and may increase risk of line thrombosis.",
      "fail_rate": 0.9,
      "condition": "",
      "sources": []
    },
    {
      "action": "Discard the first 5 mL of blood from the central line before drawing culture",
      "why_fails": "Discard protocols reduce heparin contamination but do not eliminate skin flora from the hub; paired peripheral cultures remain necessary.",
      "fail_rate": 0.75,
      "condition": "",
      "sources": []
    },
    {
      "action": "Apply topical antiseptic to the hub for 30 seconds instead of 60 seconds",
      "why_fails": "Inadequate antisepsis time (<60 seconds) fails to eliminate coagulase-negative staphylococci, the most common contaminant.",
      "fail_rate": 0.8,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "Draw at least one set of blood cultures from a peripheral vein (antecubital or forearm) and one set from each central lumen suspected of infection. Use sterile technique: clean skin with 2% chlorhexidine in 70% isopropyl alcohol for 60 seconds, allow to dry 30 seconds. Collect 10 mL per bottle (aerobic and anaerobic).",
      "success_rate": 0.93,
      "how": "Draw at least one set of blood cultures from a peripheral vein (antecubital or forearm) and one set from each central lumen suspected of infection. Use sterile technique: clean skin with 2% chlorhexidine in 70% isopropyl alcohol for 60 seconds, allow to dry 30 seconds. Collect 10 mL per bottle (aerobic and anaerobic).",
      "condition": "",
      "sources": []
    },
    {
      "action": "If peripheral access is impossible, draw two sets from different central lumens at least 15 minutes apart, AND obtain a quantitative culture (e.g., pour-plate method) to differentiate contamination from true infection.",
      "success_rate": 0.78,
      "how": "If peripheral access is impossible, draw two sets from different central lumens at least 15 minutes apart, AND obtain a quantitative culture (e.g., pour-plate method) to differentiate contamination from true infection.",
      "condition": "",
      "sources": []
    },
    {
      "action": "Use a 'differential time to positivity' (DTP) approach: compare time to positivity between central and peripheral cultures. If central culture becomes positive >2 hours earlier than peripheral, it indicates catheter-related infection.",
      "success_rate": 0.88,
      "how": "Use a 'differential time to positivity' (DTP) approach: compare time to positivity between central and peripheral cultures. If central culture becomes positive >2 hours earlier than peripheral, it indicates catheter-related infection.",
      "condition": "",
      "sources": []
    }
  ],
  "workarounds_zh": [
    "Draw at least one set of blood cultures from a peripheral vein (antecubital or forearm) and one set from each central lumen suspected of infection. Use sterile technique: clean skin with 2% chlorhexidine in 70% isopropyl alcohol for 60 seconds, allow to dry 30 seconds. Collect 10 mL per bottle (aerobic and anaerobic).",
    "If peripheral access is impossible, draw two sets from different central lumens at least 15 minutes apart, AND obtain a quantitative culture (e.g., pour-plate method) to differentiate contamination from true infection.",
    "Use a 'differential time to positivity' (DTP) approach: compare time to positivity between central and peripheral cultures. If central culture becomes positive >2 hours earlier than peripheral, it indicates catheter-related infection."
  ],
  "transition_graph": {
    "leads_to": [],
    "preceded_by": [],
    "frequently_confused_with": []
  },
  "official_doc_url": null,
  "official_doc_section": null,
  "error_code": "CLABSI-CULT-003",
  "verification_tier": "ai_generated",
  "confidence": 0.89,
  "fix_success_rate": 0.86,
  "resolvable": "true",
  "first_seen": "2024-04-05",
  "last_confirmed": "2024-06-01",
  "last_updated": "2024-06-01",
  "evidence_count": 1,
  "tags": [],
  "locale": "en",
  "aliases": []
}