Arista AH — Microporous Polysaccharide Hemospheres
Arista AH is a plant-starch-derived hemostatic powder composed of microporous polysaccharide hemospheres (MPH). The agent works by rapidly absorbing water and small molecules from blood, concentrating platelets, red cells, and clotting factors onto the matrix surface to accelerate natural clot formation. Unlike Surgicel, Arista is typically absorbed in 24–48 hours; this does not remove the need to clear excess material or avoid urinary-lumen retention.[1]
Mechanism
- Hydrophilic polysaccharide spheres absorb ~1–2× their weight in water from blood within seconds
- Water absorption concentrates platelets, red cells, and clotting factors against the matrix surface
- The concentrated environment accelerates fibrin formation
- Matrix enzymatically degrades within 24–48 hours — rapid resorption
- Rapid absorption generally limits persistence; residual material and complications cannot be excluded by an absolute time guarantee
- Never place in a blood vessel; intravascular use can cause embolization
Like Surgicel, Arista is a passive matrix — efficacy depends on native clotting function.
Distinctive Features vs. Other Matrices
| Feature | Arista AH | Surgicel | Gelfoam |
|---|---|---|---|
| Source | Plant starch (polysaccharide) | Plant cellulose | Porcine gelatin |
| Time to resorption | 24–48 hours | 7–14 days | 4–6 weeks |
| Foreign body granuloma risk | Very low | Moderate | Moderate |
| Form | Powder | Fabric / fibril / powder | Sponge / flowable |
| Acidic microenvironment | No (neutral) | Yes (low pH) | No (neutral) |
Rapid absorption does not establish zero granuloma or stone risk. The manufacturer specifically warns against leaving Arista in the renal pelvis or ureters.[2]
GU Applications
- Diffuse renal-bed oozing after partial nephrectomy
- Pelvic sidewall after lymphadenectomy
- Flap donor-bed oozing (gracilis, ALT, VRAM)
- Buccal mucosa donor site — brief tamponade without persistent foreign body in the oral cavity
- Scrotal / perineal bleeding after Fournier's debridement
- Urinary tract-adjacent placement — use cautiously; rapid absorption does not justify leaving material in the collecting system. No comparative GU evidence cited here establishes superiority to Surgicel.
Application Technique
- Dry the field — Arista works by absorbing fluid, so a pooled field is less effective
- Sprinkle powder over the oozing surface — the bellows-delivery device (supplied with product) distributes evenly
- Apply wound-appropriate direct pressure, using a nonadherent interface when needed
- Do not wipe — let the coagulum consolidate
- Remove excess by irrigation and aspiration once hemostasis is achieved, while preserving the formed clot. Arista expands markedly on fluid contact; excess can compress nearby structures.[2]
Advantages
- Rapid absorption; not proof of safety in infected fields or of absent postoperative imaging findings
- Plant-derived — no animal or human blood-product source; suitable for patients with religious restrictions on animal products
- Plant-derived composition; no blanket guarantee against adverse tissue reactions
- Fast preparation — powder ready to use, no reconstitution
- Cost effective for routine oozing (cheaper than FloSeal, similar to Surgicel)
Limitations
- Passive only — ineffective against rapid arterial bleeding
- Reduced efficacy in severe coagulopathy / heparinization
- Powder can blow around in the surgical field — aim carefully, especially in laparoscopic cases where the pneumoperitoneum can disperse the powder
- Not as effective as FloSeal for venous / broad surface bleeding in anticoagulated patients
See Also
References
1. Tschan CA, Nieman F, Oertel J. Hemostatic agents in spine surgery. J Neurol Surg A Cent Eur Neurosurg. 2014;75(6):500–3. doi:10.1055/s-0034-1371511
2. BD. Arista AH indications, warnings and application instructions. Accessed September 11, 2026.