title: [Study of hydrodynamic characteristics of artificial heart valves by photochromic imaging].
abstract: The paper deals with the hydrodynamics of artificial heart valves (AHVs) used in clinical practice. It reviews and analyzes the studies of AHV hydrodynamics, as well as the hydrodynamic beds which stimulate physiological flow through the valve. Photochronic imaging (PCI) is proposed for examination of AHV hydrodynamic characteristics under model physiological flow. The hydrodynamics of different AHVs was tested on the beds simulating blood flow through AHVs by employing PCI. PCI involved preparation of model photochronic solution that simulates blood, colour labels by using laser radiation. In the model photochronic solution, 10(-6)-10(-9)-sec laser radiation gave rise to linear colour labels whose movement was recorded by a speed camera in the flow behind the valve. The profiles of speed behind the valves, the dimensions of congestive areas, the positions of flow detachment and regurgitation flow were calculated by a speed shooting in different periods of valvular performance. PCI defined congestive areas behind the valves, the areas of closed circulations, the sizes of reversing flow areas and examined the time course of flow behind the valves as a whole. The paper is of interest for AHV designers and cardiac surgeons who apply various AHVs.
authors.forename: L M
authors.initials: LM
authors.lastname: Vil'danov
authors.forename: M P
authors.initials: MP
authors.lastname: Etonov
authors.forename: V N
authors.initials: VN
authors.lastname: Iurechko
mesh_terms: D003116:Color; D003326:Coronary Circulation; D006350:Heart Valve Prosthesis; D007834:Lasers; D008027:Light; D008954:Models, Biological; D008956:Models, Chemical; D008961:Models, Structural; D010777:Photochemistry; D010781:Photography; D012996:Solutions; D014466:Ultraviolet Rays
chemical_list: D012996:Solutions