protamine reaction - types

Q: What are the three types of Protamine reaction?

Answer: The term "types of protamine reaction" is kind of a misnomer. In fact, it is the severity level.

Type I is a mild, transient reaction usually caused by rapid infusion. It is histamine-mediated and causes manageable vasodilation and hypotension.

Type II is characterized by a true anaphylactic or anaphylactoid hypersensitivity reaction (probably IgE-mediated), with features such as hypotension, bronchoconstriction, and urticaria.

Type III is a catastrophic pulmonary vasoconstrictive reaction characterized by complement/IgG activation, leading to sudden pulmonary hypertension, right ventricular failure, and severe noncardiogenic pulmonary edema.

Risk factors for such reactions are 

• prior protamine exposure 
• NPH insulin use
• fish allergies, and 
• vasectomy 

Management is usually supportive with pressors, IVF, and, in severe cases, ECMO.

#allergy-immunology

#pharmacology

#hemodynamics

References:

1. Pannu BS, Sanghavi DK, Guru PK, Reddy DR, Iyer VN. Fatal right ventricular failure and pulmonary hypertension after protamine administration during cardiac transplantation. Indian J Crit Care Med. 2016 Mar;20(3):185-7. doi: 10.4103/0972-5229.178185. PMID: 27076733; PMCID: PMC4810899.

2. Porsche R, Brenner ZR. Allergy to protamine sulfate. Heart Lung. 1999 Nov-Dec;28(6):418-28. doi: 10.1016/s0147-9563(99)70031-2. PMID: 10580216.

3. Weiss ME, Adkinson NF Jr. Allergy to protamine. Clin Rev Allergy. 1991 Fall-Winter;9(3-4):339-55. doi: 10.1007/BF02802312. PMID: 1782626.