Word: pumps
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Dates: during 1960-1969
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Heart: A New Pump to Save The Ordinary Attack Victim...
...have been trying for a quarter-century to develop an effective treatment for the commonest form of heart attack-a coronary occlusion-learned in Chicago last week of a daring and original method devised by a young Harvard researcher. The method is to hook the patient to a pump that beats out-of-step with the heart's own beat, to create the most favorable conditions for the heart to develop substitute channels of circulation around the area of the occlusion (the shutdown in one of the heart wall's own arteries...
...Jacobey and colleagues began by giving dogs standardized heart attacks by injecting plastic pellets into their coronaries. Five out of six dogs died. Then they hooked up six other dogs, also given heart attacks, to a small, simple pump that is timed by the electrocardiograph. When the heart contracts, the pump is relaxed and actually withdraws a little blood. When the heart relaxes, the pump gets in its "beat"' and forces blood through the aorta into the coronary arteries. After two hours on the pump, five out of these six dogs lived...
...Jacobey explained that 1) the pump reduces the heart's work when it has just been damaged and its condition is most critical, 2) it increases the flow through all coronary vessels, but 3) it causes the greatest increase in the formerly dormant collateral branches...
...first human trials of the new technique, at the Peter Bent Brigham Hospital, five patients in severe shock, with catastrophically low blood pressure and with little chance of survival, have been hooked up to the pump. The operation is relatively simple, requiring only an incision in an arm artery, for pressure measurements, and one in the femoral artery for the counterpulse pump tube...