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Contrast Reaction Management (ACR 2024)

Contrast Reaction Management (ACR 2024): Contrast Reaction Suspected → STOP Contrast Injection → Severity Assessment → Mild Reaction → Post-Reaction Obs...

Pathway Overview

12 steps

Algorithm Steps

12 total

  1. 01Start

    Contrast Reaction Suspected

    During or after contrast administration

  2. 02Warning

    STOP Contrast Injection

    Immediate action

    • Stop contrast administration immediately
    • Keep IV access
    • Call for help
    • Have crash cart ready
    • Notify radiologist
  3. 03Decision

    Severity Assessment

    Classify reaction severity

  4. 04Action

    Mild Reaction

    Self-limited, usually no treatment needed

    • SYMPTOMS:
    • - Limited urticaria/hives
    • - Mild itching
    • - Nasal congestion
    • - Sneezing
    • - Nausea (no vomiting)
    • - Flushing/warmth
    • TREATMENT:
    • - Observation (30 min minimum)
    • - Diphenhydramine 25-50mg PO/IV (optional)
    • - Reassurance
  5. 05Action

    Post-Reaction Observation

    Monitor for biphasic reaction

    • MILD: 30 minutes observation
    • MODERATE: 1-2 hours observation
    • SEVERE: Extended observation/admission
    • BIPHASIC REACTION:
    • - Can occur 1-72 hours later
    • - Occurs in up to 20% of anaphylaxis
    • - Educate patient on symptoms
  6. 06Action

    Documentation & Prevention

    Critical for future care

    • DOCUMENT IN CHART:
    • - Exact symptoms and timing
    • - Contrast type and volume
    • - Treatment given and response
    • - Severity classification
    • ALLERGY ALERT:
    • - Add to allergy list
    • - Specify: 'Iodinated contrast'
    • - Note severity
    • FUTURE STUDIES:
    • - Consider alternative modality
    • - If contrast needed: Premedication
  7. 07Action

    Premedication Protocol

    For high-risk patients needing contrast

    • ACR RECOMMENDED REGIMEN:
    • - Prednisone 50mg PO at 13h, 7h, 1h before
    • - Diphenhydramine 50mg PO/IV 1h before
    • EMERGENCY PROTOCOL (if urgent):
    • - Methylprednisolone 40mg IV q4h x 2
    • - Diphenhydramine 50mg IV 1h before
    • NOTE:
    • - Reduces but doesn't eliminate risk
    • - Breakthrough reactions still possible
  8. 08Outcome

    Outcome

    Follow-up

    • Mild: Return to normal activity
    • Moderate: Usually no sequelae
    • Severe: Referral to allergist
    • Fatality rate: Very rare (<1:170,000)
  9. 09Action

    Moderate Reaction

    More significant symptoms, treatment needed

    • SYMPTOMS:
    • - Diffuse urticaria
    • - Facial/laryngeal edema (mild)
    • - Bronchospasm (mild wheeze)
    • - Tachycardia
    • - Vomiting
    • TREATMENT:
    • - O2 6-10 L via mask
    • - Diphenhydramine 25-50mg IV
    • - Albuterol nebulizer if wheeze
    • - Monitor closely
    • - Prepare epinephrine
  10. Path rejoins step 05Shared downstream outcome
  11. 10Warning

    Severe Reaction (Anaphylaxis)

    LIFE-THREATENING - ACT IMMEDIATELY

    • SYMPTOMS:
    • - Hypotension (SBP <90)
    • - Respiratory distress/stridor
    • - Laryngeal edema (severe)
    • - Severe bronchospasm
    • - Altered consciousness
    • - Cardiac arrest
    • THIS IS ANAPHYLAXIS
  12. 11Warning

    Anaphylaxis Treatment

    EPINEPHRINE IS FIRST-LINE

    • EPINEPHRINE (CRITICAL):
    • - Adult: 0.3-0.5 mg (0.3-0.5 mL of 1:1000) IM
    • - Anterolateral thigh preferred
    • - Repeat q5-15 min if needed
    • ADJUNCTS:
    • - IV access, fluids (NS 1-2L bolus)
    • - O2 high flow
    • - Diphenhydramine 50mg IV
    • - Methylprednisolone 125mg IV
    • - Albuterol for bronchospasm
    • IF REFRACTORY:
    • - Epinephrine drip
    • - Call code/anesthesia
  13. Path rejoins step 05Shared downstream outcome
  14. 12Action

    Vasovagal Reaction

    Not allergic - different treatment

    • SYMPTOMS:
    • - Bradycardia (not tachycardia)
    • - Hypotension
    • - Diaphoresis
    • - Pallor
    • - Nausea
    • TREATMENT:
    • - Elevate legs (Trendelenburg)
    • - IV fluids
    • - Atropine 0.5-1 mg IV if bradycardia severe
    • - Usually resolves quickly
  15. Path rejoins step 05Shared downstream outcome

Guideline Source

ACR Manual on Contrast Media 2024

DOI: N/A

Clinical Safety Information

Clinical Decision Support — Not a Substitute for Clinical Judgment

Individual patient factors may require deviation from these recommendations.

Known Limitations

  • Severity can escalate rapidly
  • Prior reaction increases risk
  • Premedication reduces but doesn't eliminate risk
  • Delayed reactions can occur hours later

Applicable Regions

USEU
Version 1Next review: 2027-01-11

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Frequently Asked Questions

What is the Contrast Reaction Management (ACR 2024)?

The Contrast Reaction Management (ACR 2024) is a emergency clinical algorithm for Radiology. It provides a structured decision tree to guide clinical decision-making, based on ACR Manual on Contrast Media 2024.

What guideline is the Contrast Reaction Management (ACR 2024) based on?

This algorithm is based on ACR Manual on Contrast Media 2024 (DOI: N/A).

What are the limitations of the Contrast Reaction Management (ACR 2024)?

Known limitations include: Severity can escalate rapidly; Prior reaction increases risk; Premedication reduces but doesn't eliminate risk; Delayed reactions can occur hours later. Individual patient factors may require deviation from these recommendations.

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