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Related Experiment Videos

Anaphylactic shock following protamine administration

F K Vontz, E C Puestow, D J Cahill

    The American Surgeon
    |October 1, 1982
    PubMed
    Summary

    Diabetics taking neutral protein Hagedorn (NPH) insulin may face severe anaphylaxis from protamine. Caution and potential skin testing are advised before protamine administration in sensitized patients.

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    Area of Science:

    • Immunology
    • Cardiovascular Medicine
    • Endocrinology

    Background:

    • Protamine is used clinically, often post-cardiac surgery or for heparin reversal.
    • While cardiovascular effects of protamine are known, its immunologic mechanisms are less understood.
    • Neutral protein Hagedorn (NPH) insulin contains protamine as a suspending agent.

    Observation:

    • A diabetic patient on NPH insulin experienced a severe anaphylactic reaction post-carotid endarterectomy after protamine injection.
    • This reaction highlights a potential immunologic link between NPH insulin and protamine.
    • The patient had a history of NPH insulin use, suggesting prior sensitization.

    Findings:

    • Protamine administration can trigger severe anaphylaxis in patients previously exposed, such as those using NPH insulin.
    • Immunologic mediation of protamine's action, particularly in sensitized individuals, warrants further investigation.
    • This case suggests a potential cross-reactivity or sensitization pathway.

    Implications:

    • Caution is crucial when administering protamine to patients with potential protamine sensitization.
    • Diabetics using NPH insulin, blood donors, and prior cardiac surgery patients are at increased risk.
    • Pre-administration screening, including skin testing and premedication, may be necessary to prevent adverse events.

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