Table 2.

Characteristics of various stentless valves

Bioprosthesis	Company	Material and treatment	Key remarks
O’Brien valve	CryoLife	Porcine valve with GAH low-pressure fixation	Actuarial freedom from SVD 91% at 5 years and 44% at 10 years70
Toronto SPV valve	St Jude Medical	Porcine valve with GAH low-pressure fixation	Freedom from reoperation 75% ± 5% at 12 years40
Freestyle valve	Medtronic	Porcine aortic root with GAH zero-pressure fixation with amino oleic acid treatment	Actuarial freedom from SVD 97.0% ± 2.2% (subcoronary), 96.0% ± 4.5% (full root), and 90.9% ± 11.2% (root inclusion) at 10 years,23 but deteriorate thereafter68
Prima Plus valve	Edwards Lifesciences	Porcine aortic root with GAH low-pressure fixation and XenoLogiX anticalcification treatment	Actuarial survival rate 71.5% at 8 years and freedom from SVD 97.8% at 8 years25
Biocor stentless valve	St Jude Medical	Porcine valve sutured to a GAH-treated bovine pericardial conduit	Freedom from reoperation 98.9% ± 0.7% at 9 years18
Pericarbon freedom valve	Sorin Biomedica	Bovine pericarial valve composed of two sheets sutured together, GAH treated, and detoxificated with homocysteic acid	Freedom from valve-related death and reoperation 91% ± 4% and 94% ± 4% at 7 years No structural valve deterioration observed10
Super-stentless valve	Shelhigh	Porcine valve mounted on a superflexible ring with GAH and No-React anticalcification treatment	Possible contamination and malfuction warning by the US Food and Drug Administration71
3F Therapeutics stentless valve	ATS Medical	Equine pericardial tubular valve treated with bufferd formulation of GAH fixation	Large effective orifice area (1.7 cm2)11

Abbreviations: GAH, glutaraldehyde; SVD, structural valve deterioration.