Table 2.

Categories of acute adverse reactions adapted from the ACR Manual on Contrast Media and ESUR Guideline.

	Allergic-Like/Hypersensitivity	Chemo-Toxic
Mild
	Limited urticaria/pruritis	Limited nausea/vomiting limited
	Cutaneous edema	Transient flushing/warmth/chills
	Limited “itchy”/”scratchy” throat	Headache/dizziness/anxiety/altered taste
	Nasal congestion	Mild hypertension
	Sneezing/conjunctivitis/rhinorrhea	Vasovagal reaction that resolves spontaneously
Moderate
	Diffuse urticaria/pruritis	Protracted nausea/vomiting
	Diffuse erythema, stable vital signs	Hypertensive urgency
	Facial edema without dyspnea	Isolated chest pain
	Throat tightness or hoarseness without dyspnea	Vasovagal reaction that requires and is responsive to treatment
	Wheezing/bronchospasm, mild or no hypoxia
Severe
	Diffuse edema, or facial edema with dyspnea	Vasovagal reaction resistant to treatment
	Diffuse erythema with hypotension	Arrhythmia
	Laryngeal edema with stridor and/or hypoxia	Convulsions, seizures
	Wheezing/bronchospasm, significant hypoxia	Hypertensive emergency
	Anaphylactic shock (hypotension + tachycardia)