Cardiac Arrest From Sulfur Hexafluoride Contrast Anaphylaxis After Prior Perflutren Hypersensitivity

This is to our knowledge the first reported case of sulfur hexafluoride lipid microspheres anaphylaxis resulting in cardiac arrest in a patient with prior hypersensitivity to perflutren lipid microspheres. Clinicians should anticipate cross-sensitization between UEAs and maintain immediate access to resuscitation measures.