IV Iron-Induced Respiratory Issues

Introduction to Respiratory Reactions

The American Society of Hematology notes that IV iron can cause respiratory symptoms during infusion, including shortness of breath, transient cough, bronchospasm, and stridor, though these are uncommon and typically occur as part of a hypersensitivity reaction rather than isolated pulmonary disease 1, 2

The American Journal of Hematology states that the respiratory symptoms that occur during IV iron infusion are primarily due to complement activation-related pseudo-allergy (CARPA) rather than true IgE-mediated allergic reactions 1, 2
CARPA reactions are caused by labile free iron released from the iron carbohydrate nanoparticle, which activates complement and triggers mast cell degranulation without requiring prior sensitization 1, 2

Moderate hypersensitivity reactions include respiratory symptoms such as transient cough and shortness of breath, often accompanied by tachycardia or hypotension, according to the American Journal of Hematology 2, 3
Severe/life-threatening reactions include more concerning respiratory manifestations such as stridor, bronchospasm, and angioedema, as reported by the American Journal of Hematology 2

The American Journal of Hematology recommends immediate actions for respiratory symptoms, including stopping the infusion, switching to normal saline, notifying a physician, and monitoring vital signs 2, 3
For moderate respiratory symptoms, the American Journal of Hematology suggests monitoring for at least 15 minutes, considering IV hydrocortisone and famotidine, and administering oxygen if necessary 2, 3
For severe respiratory symptoms, the American Journal of Hematology recommends immediately calling emergency services, administering epinephrine, considering a β2 agonist nebulizer, and treating as anaphylaxis with full resuscitation protocols 2, 3

Patients at higher risk for respiratory reactions include those with a history of severe asthma or eczema, mastocytosis, and prior reaction to IV iron, according to the American Journal of Hematology 2

The American Journal of Hematology recommends key preventive measures, including using slower infusion rates, observing closely during the first 10 minutes, ensuring proper IV line placement, and considering alternative iron formulations if reactions occur 1, 2, 3