**Question:** Tissue suturing glue contains-

A. Histidine
B. Adhesive proteins
C. Cyanoacrylate
D. Thrombin

**Core Concept:** Tissue suturing glue is a medical adhesive used to seal and close tissue surfaces during surgery or wound healing, reducing the risk of infection, scarring, and complications associated with traditional sutures.

**Why the Correct Answer is Right:** Tissue suturing glue, specifically cyanoacrylate, is a synthetic adhesive that polymerizes (forms a solid mass) when exposed to moisture, such as occurs when applied to wet tissue surfaces. The correct answer, **C. Cyanoacrylate**, is a chemical compound used in these adhesives.

**Why Each Wrong Option is Incorrect:**

A. Histidine (Option A) is an amino acid commonly found in proteins, but it is not the primary component of tissue suturing glue. Histidine is essential for protein synthesis and does not have adhesive properties.

B. Adhesive proteins (Option B) are used in some suture materials, but not in tissue suturing glue. Adhesive proteins are primarily involved in tissue repair and healing, not adhesion.

D. Thrombin (Option D) is a plasma protein that promotes blood clotting and is used in suturing materials, not tissue suturing glue. Thrombin is involved in the coagulation cascade, not tissue adhesion.

**Clinical Pearl:** Cyanoacrylate tissue suturing glue is a safe, efficient, and minimally invasive alternative to traditional sutures and staples, particularly useful in delicate and complex surgical procedures.

**Correct Answer Explanation:** Cyanoacrylate tissue suturing glue, like Dermabond, is composed of cyanoacrylate monomers that polymerize upon contact with tissue moisture, forming a strong mechanical bond. Cyanoacrylate tissue sutures are used in various medical applications such as wound closure, hemostasis, and tissue repair. These glues have been shown to provide comparable or superior results compared to traditional sutures, with advantages like reduced infection risk, decreased post-operative pain, and shorter healing times.

**Why Each Wrong Option is Incorrect:**

A. Histidine is an amino acid involved in protein synthesis, not a component of tissue adhesive.

B. Adhesive proteins are part of the wound healing process, but not the primary adhesive component in tissue suturing glues.

C. Thrombin is a clot-promoting enzyme used in surgical procedures, particularly blood clotting, not in tissue adhesion.

**Clinical Pearls:**

- Cyanoacrylate tissue sutures are suitable for delicate tissues, minimizing tissue damage and reducing infection risk compared to sutures.
- The exact formulation of cyanoacrylate tissue sutures differs from traditional sutures, providing unique advantages in specific medical applications.

- When choosing an adhesive for tissue closure, consider factors such as tissue type, infection risk, and post-operative pain when comparing cyanoacrylate tissue adhesives to traditional sutures.