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Topical Thrombin

Topical thrombin is a purified active coagulation factor that directly catalyzes fibrinogen → fibrin conversion, producing hemostasis independent of the upstream coagulation cascade. Available in bovine, pooled-human plasma-derived, and recombinant human sources, topical thrombin is used alone (spray or painted onto a surface), combined with gelatin matrix (Gelfoam + thrombin slurry, or pre-formulated FloSeal), or as a component of fibrin sealants (Tisseel, Evicel).[1]

Sources​

SourceProduct namesNotes
BovineThrombin-JMIOlder; rare antibody formation and coagulopathy reports
Human plasma pooledEvithromDerived from screened human plasma
Recombinant humanRecothromNo animal or human donor source; lowest immunogenicity

Recombinant thrombin (Recothrom) has become the default at most U.S. institutions due to its favorable immunologic profile and independence from human or animal plasma supplies.

Mechanism​

  • Thrombin cleaves fibrinogen directly to fibrin monomer, which polymerizes into insoluble fibrin strands
  • Bypasses the entire intrinsic/extrinsic cascade — active even in heparinized or factor-deficient patients (as long as fibrinogen is present)
  • Concentration typically 1000 units/mL for topical use
  • Onset of clot formation within ~10 seconds of contact with blood

Delivery Modes​

1. Thrombin alone (spray or painted)​

  • Spray applicator or saturated pledget
  • Painted onto a bleeding surface with a blunt catheter or syringe
  • Limited standalone use — better coupled with a matrix to localize and prolong contact

2. Thrombin-soaked Gelfoam​

The classical combination:

  • Reconstitute thrombin to 1000 units/mL
  • Saturate a Gelfoam sponge in the thrombin solution
  • Apply the soaked sponge to the bleeding surface
  • Provides the mechanical tamponade of Gelfoam + the active biochemistry of thrombin

3. Pre-formulated (FloSeal)​

  • See FloSeal
  • Thrombin pre-combined with cross-linked gelatin granules in a flowable format

4. Fibrin sealant component​

GU Applications​

  • Neurovascular bundle protection during RARP — thrombin-soaked Gelfoam strip placed along the NVB for hemostasis without cautery
  • Partial nephrectomy renal bed — thrombin-soaked Gelfoam or FloSeal
  • Post-prostatectomy pelvic sidewall — thrombin-soaked pledgets for diffuse oozing
  • Bladder neck reconstruction — after Y-V plasty or complex repair
  • Bone bleeding (pubic bone, sacrum) — thrombin-soaked Gelfoam packed into the bleeding marrow

Contraindications and Cautions​

  • Never inject intravascularly — thrombin in a vein causes pulmonary embolism
  • Bovine thrombin + coagulopathy — bovine thrombin can induce antibodies that cross-react with human thrombin and factor V, rarely producing refractory bleeding weeks later; recombinant or human thrombin avoids this
  • Anaphylaxis — rare with any thrombin product
  • Fibrinogen deficiency — thrombin alone is ineffective if the local fibrinogen is depleted (give fibrinogen concentrate or use a fibrin sealant containing both fibrinogen + thrombin)

Key Pearl — When to Reach for Thrombin​

Topical thrombin is the right answer when:

  • The patient is heparinized and passive matrices are inadequate
  • Coagulopathy is known or suspected (cirrhosis, DIC, factor deficiency, DOAC)
  • Bleeding is from a raw surface that cannot be cauterized (nerve, major vessel adventitia, bone)
  • Gelfoam alone is failing — saturate it with thrombin to upgrade to an active agent

See Also​

References​

1. Schreiber MA, Neveleff DJ. Achieving hemostasis with topical hemostats: making clinically and economically appropriate decisions in the surgical and trauma settings. AORN J. 2011;94(5):S1–S20. doi:10.1016/j.aorn.2011.09.018