“…Intravascular obstruction is not purely a mechanical phenomenon and is always associated with endothelial cell damage (Turrito and Baumgartner, 1976) and ischemia (Kramer and Folts, 1973) which release a wide variety of vasoactive substances (Imhoff, 1961). These substances are believed to regulate the delivery of blood to the tissues (Afonso et al, 1974;Schaub et al, 1977a) often resulting in the necrosis of the part they serve (Bulle, 1957;Schaub et al, 1977b). SRT is one substance being released during arterial occlusion (Bloor et al, 1973;Sullenberger et al, 1959;Kordenat and Kezdi, 1979) and Schaffer, 1951;Conrad et al, 1971;Giron et al, 1971;Barnes, 1980),.…”