Contrast & Safety

Key points

• Confirm indication and expected diagnostic benefit.
• Ask about previous contrast reaction and severity.
• Check renal function when required by local policy.
• Review pregnancy status when relevant.
• Confirm IV access quality and injection rate.

Action

• Use the lowest dose that answers the clinical question.
• Document allergy/reaction history clearly.
• Escalate to radiologist when prior severe reaction or high renal risk exists.

Warning

Do not delay emergency life-saving imaging solely for routine screening if the result will change urgent management.

Key points

• Confirm that contrast is needed for the question.
• Check renal function in at-risk patients.
• Use local GBCA group policy for renal impairment.
• Ask about prior GBCA reaction.
• Review pregnancy status when relevant.

Action

• Prefer macrocyclic/group II agents when local policy requires lower NSF risk.
• Document agent and dose.
• Use non-contrast MRI when it answers the question.

Warning

Avoid routine gadolinium in pregnancy unless expected benefit clearly outweighs risk.

Key points

• Differentiate allergy-like from physiologic symptoms.
• Observe until symptoms improve.
• Record reaction type, severity and treatment.
• Warn the patient to report worsening symptoms.

Action

• Stop injection if symptoms occur during injection.
• Assess airway, breathing and circulation.
• Call radiologist/nurse per local protocol.
• Treat according to local emergency chart.

Warning

Mild symptoms can rarely progress, so do not leave the patient unattended until stable.

Key points

• This is an emergency workflow.
• Airway and hemodynamics come first.
• Adrenaline/epinephrine use follows local emergency protocol.
• Document timing, contrast type, dose and treatment.

Action

• Stop contrast injection immediately.
• Call emergency response.
• Give oxygen and monitor vitals.
• Prepare emergency medication according to site protocol.
• Transfer for continued observation when needed.

Warning

Use the department's official emergency drug chart. Do not rely on memory for doses.

Key points

• Identify exact agent if possible.
• Classify reaction as mild, moderate or severe.
• Separate true allergy-like reaction from nausea/warmth/vasovagal symptoms.
• Previous severe reaction needs radiologist review.

Action

• Consider alternative modality or non-contrast protocol.
• Use different agent when appropriate.
• Premedication follows local policy, not automatic habit.
• Ensure emergency readiness.

Warning

Premedication reduces risk but does not guarantee prevention of a breakthrough reaction.

Key points

• Assess urgency and diagnostic benefit.
• Look for acute kidney injury, not just chronic eGFR.
• Hydration strategy follows local policy.
• Avoid duplicate nephrotoxic exposures when possible.

Action

• Discuss high-risk cases with radiologist/referrer.
• Use alternative imaging if it answers the question.
• Document risk-benefit decision for urgent studies.

Warning

Do not use a single fixed eGFR threshold without considering urgency, AKI and local policy.

Key points

• NSF risk depends on agent group and renal status.
• Use local GBCA policy and approved agents.
• Avoid unnecessary repeat GBCA exposure.
• Dialysis timing decisions follow local policy.

Action

• Confirm contrast necessity.
• Use safer agent category per local protocol.
• Document agent and renal status.

Warning

High-risk renal patients should be reviewed before GBCA administration.

Key points

• Risk relates to renal function and acute kidney injury.
• Routine stopping is not always required in low-risk patients.
• Policies vary by institution.
• Clear instructions reduce patient confusion.

Action

• Follow local metformin/eGFR policy.
• Give written restart advice when metformin is held.
• Escalate if AKI or severe renal impairment is present.

Warning

Do not give generic advice without checking the department policy.

Key points

• Justification and optimization are essential.
• Iodinated contrast crosses placenta.
• Urgent maternal diagnosis may justify contrast.
• Dose optimization matters for ionizing imaging.

Action

• Prefer US/MRI if diagnostic and timely.
• Do not delay urgent maternal care.
• Document risk-benefit discussion when appropriate.

Warning

Maternal stabilization and accurate diagnosis often protect both mother and fetus.

Key points

• Non-contrast MRI is preferred when sufficient.
• Gadolinium crosses placenta.
• Use only when essential and expected benefit is high.
• Radiologist review is required.

Action

• Remove contrast if non-contrast MRI can answer the question.
• Discuss with referring clinician for high-impact cases.
• Document rationale when GBCA is used.

Warning

Avoid routine gadolinium during pregnancy.

Key points

• Very small amounts enter breast milk.
• Even smaller amounts are absorbed by the infant gut.
• Many guidelines allow continued breastfeeding.
• Patient preference should be respected.

Action

• Provide calm counseling.
• Offer pump-and-discard only if patient strongly prefers after explanation.
• Document discussion if there is concern.

Warning

Avoid unnecessarily alarming language.

Key points

• Stop injection immediately.
• Assess volume, site, pain, skin changes and neurovascular status.
• Most cases are managed conservatively.
• Severe pain, blistering or neurovascular compromise needs urgent review.

Action

• Elevate limb.
• Apply local hot/cold policy.
• Give written return advice.
• Document agent, volume and examination.

Warning

Do not ignore progressive pain, numbness, reduced perfusion or skin blistering.

Key points

• Weight-based dose is mandatory.
• Use child-appropriate IV access and injection rate.
• Minimize radiation where applicable.
• Child-friendly preparation reduces motion and failed studies.

Action

• Confirm weight and dose.
• Use pediatric protocol.
• Prepare reaction equipment and monitoring appropriate for age.

Warning

Never estimate pediatric contrast dose without a current weight.

Key points

• Clarify the clinical question.
• Check if non-contrast or alternate modality can answer it.
• Assess risk factors separately instead of using one generic label.
• Make a documented plan before injection.

Action

• Discuss with radiologist.
• Confirm emergency readiness.
• Use appropriate agent and route.
• Record final decision and limitation.

Warning

High-risk does not always mean no contrast; it means deliberate risk-benefit planning.