Microfibrillar Collagen Induced Coagulation

Mechanism of Action

• Microfibrillar collagen (Avitene) directly triggers platelet aggregation, resulting in clot formation when in contact with a bleeding surface, and it actively entraps and activates platelets, initiating the clotting cascade 1, 2.
• Oxidized cellulose works primarily through physical absorption and creation of an artificial clot rather than direct activation of the coagulation cascade, with its hemostatic effect being less studied 1, 3.
• Absorbable gelatin sponge works by swelling when in contact with blood, which reduces blood flow, and may enhance hemostasis when combined with thrombin but does not directly activate the coagulation process 1, 4.
• Superglue (cyanoacrylate) functions as a tissue adhesive and sealant rather than directly inducing coagulation, creating a mechanical barrier but does not actively participate in the coagulation cascade 2.

Clinical Applications and Effectiveness

• The direct platelet-activating properties of collagen-based agents like Avitene make them especially useful in situations where other hemostatic mechanisms may be compromised 1, 2.
• Collagen-based agents are often combined with pro-coagulant substances such as thrombin to further enhance their hemostatic effect, though microfibrillar collagen itself directly induces coagulation 1.

Use of Surgical Gel Foam for Cavity Bleeding Control

Clinical Applications and Recommendations

• The American College of Cardiology recommends using absorbable gelatin sponge as a local hemostatic measure during surgical procedures to stop bleeding in a cavity 5, 6
• Absorbable gelatin sponge can be used in combination with sutures to control bleeding effectively during invasive procedures, as recommended by the American College of Cardiology 5
• The European guideline on management of major bleeding following trauma mentions that absorbable gelatin sponges with or without thrombin may be useful in difficult cases but are rarely required for more routine procedures 7
• For surgical procedures where anticoagulants cannot be stopped, absorbable gelatin sponges with or without thrombin may be particularly useful, according to the American Academy of Ophthalmology 8