📋 Clinical Overview

n-Butyl-2-cyanoacrylate (NBCA) is a liquid embolic agent and tissue adhesive belonging to the cyanoacrylate class. It is a monomer that undergoes rapid anionic polymerization upon contact with ionic substances (e.g., blood, tissue fluids), forming a solid, flexible, and histotoxic polymer that mechanically occludes vessels and adheres to tissues. In the 0.5ml presentation, it is primarily used for the embolization of vascular malformations and as a topical hemostatic/sealant in surgical settings. It is not a systemic drug but a medical device/implant.

💊 Dosage & Administration

Adult: Dose is NOT by body weight. It is volume-based and lesion-specific. For embolization, typically 0.1ml to 0.5ml per injection, often diluted with ethiodized oil (Lipiodol) to ratios from 1:1 to 1:4 (NBCA:Oil) to control polymerization rate. Total volume per procedure varies greatly (may be 1-4ml).

Note: FOR TRAINED SPECIALISTS ONLY. Use under fluoroscopic/angiographic guidance. Must be prepared in a dedicated procedure room. For embolization: Mix with ethiodized oil in a sterile container immediately before use. Load into dedicated syringes and delivery catheters (e.g., Debrun-type or flow-directed microcatheters). Flush catheter with 5% dextrose solution (non-ionic) before and after injection to prevent premature polymerization. Injection must be a continuous, controlled push under live fluoroscopy. Catheter must be withdrawn immediately after injection to avoid being glued in place.

⚠️ Contraindications

Known hypersensitivity to cyanoacrylate compounds.
Use in infected tissues or active systemic infection.
Embolization of arteries whose occlusion would endanger vital organs or limbs (non-target embolization risk).
Patients with conditions prohibiting angiography.

🔬 Mechanism of Action

n-Butyl-2-cyanoacrylate is a liquid monomer. Upon contact with anions (e.g., hydroxide ions in water, blood, tissue fluids), it undergoes rapid exothermic anionic polymerization, transforming from a liquid to a solid, flexible polymer. This polymerization creates a mechanical plug that occludes blood vessels (embolization) or seals tissue planes (adhesion). The polymer elicits a significant foreign body inflammatory reaction, leading to fibrosis and permanent vessel/tissue occlusion.

🤕 Side Effects

Transient fever.
Local pain and tenderness at injection/application site.
Inflammatory reaction (redness, swelling).
Nausea/vomiting (post-embolization syndrome).

🤰 Special Populations

Pregnancy: Category C (Device). Animal reproduction studies have not been conducted. Use only if clearly needed and potential benefit justifies potential risk to the fetus. Radiation from fluoroscopy is an additional concern.

Driving: Patients should not drive immediately after the procedure due to effects of sedation/anesthesia. No long-term effect.

🔄 Drug Interactions

Ionic Solutions (Normal Saline, Ringer's Lactate)	Causes immediate, uncontrolled polymerization in catheter or syringe, ruining the procedure and risking catheter entrapment.	High
Heparin, Warfarin, DOACs	Increased risk of hemorrhage at vascular access site. Requires careful management of anticoagulation around procedure time.	Moderate
Iodinated Contrast Media	Can initiate polymerization if mixed. They are used sequentially, not mixed, during angiography.	High

Trufill NBCA (n-Butyl Cyanoacrylate)