مريض مجدول لقسطرة قلب بالصبغة. أي معلومة في ملفه أهم قبل الإجراء؟

A client is scheduled for cardiac catheterisation with contrast. Which information in his record matters most before the procedure?

1. He has a shellfish allergy only
2. He ate breakfast 10 hours ago
3. He had a flu vaccine last week
4. He takes metformin and his creatinine is raised

Answer: D) He takes metformin and his creatinine is raised. Contrast can injure the kidneys, and with poor renal function metformin may accumulate and cause lactic acidosis, so the provider is informed to hold it per protocol and give renal-protective fluids. A shellfish allergy alone does not mean contrast allergy, and a 10-hour fast is adequate.