The hydrodynamic characteristics of small size (17mmφ, 19mmφ, 2lmmφ) Ionescu-Shiley pericardial xenograft (ISPX) was evaluated in steady flow and a pulse duplicator system, and secured the good assesments.
176 ISPX have been implanted in 157 patients between August 1979 and October 1981. All small size ISPX were implanted in aortic positon and the number of these valves used was 2 of 17mmφ, 16 of 19mmφ and 27 of 2lmmφ.
The mean pressure gradient was 21.0mmHg with the 17mmφ valve, 17.3mmHg with the 19mmφ valve and 19.4mmHg with 2lmmφ valve.
There have been no thromboembolic episode and no valve dysfunction.
The hemodynamic characteristics of small size ISPX was satisfactrily and the incidence of thromboembolism is very low, and we will continue our clinical use of small size ISPX.
