“…In hypertensive patients a decrease in cardiac output was usually reported (GRABNER et aI., 1966;MICHEL et aI., 1966;SCHNEIDER and GATTENLOHNER, 1966;BARNETT and CANTOR, 1968;GRABNER and MICHALEK, 1968;SCHNEIDER, 1968;STENBERG et aI., 1968;VORBURGER et aI., 1967aVORBURGER et aI., , b, 1968ZIMMERMANN et aI., 1968;KROETZ et aI., 1970;BREST, 1970;MUIR, 1970;REUBI et aI., 1970;KOCH, 1971;McRAVEN et aI., 1971;ONESTI et aI., 1971). However, in some clinical trials no significant change in cardiac output was found (KOCHSIECK and FRITSCHE, 1966) or even an increase (DAVIDOV et aI., 1967;FINNERTY, 1970).…”