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Cardiac compression allows the heart to maintain pump
function by sequential filling and emptying of its chambers
with competant valves maintaining the forward direction of
flow.Palm of one hand placed over lower sternum; heel of
the other rests on dorsum of the lower hand.
To get the right speed and rhythm, count out loud as you
do the compressions, saying "1 and 2 and 3 and 4 and 5!"
Rest on each "and," then compress on each number. Each
series of 5 should take about 3 seconds. Force sufficient to
depress sternum by 3-5cms;relaxation is abrupt.