“…It has been shown that the intravenous administration of E. coli endotoxin to animals produced a progressive fall in aortic blood pressure, a drastic reduction in total blood volume, an increase in total peripheral resistance, a decrease in venous return and a diminished cardiac output (Weil, MacLean, Spink & Visscher, 1956;Heiffer, Mundy & Mehlman, 1960;Cavanagh & Rao, 1969). Changes in cardiac activity are assumed to be secondary to this circulatory response.…”