Yes - an increase in contractility would lead to an increase in stroke volume. An increased stroke volume would cause an increased cardiac output.
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Since the stroke volume increased then the cardiac out put would increase, pumping out more blood with the same amount of heart beats.
Yes, it must be so in a healthy heart. The reason is very simple. The left and right ventricles pump in the same cycle (and, if this were not the case, there would be a backlog of fluid in one system or the other).
Answer for anyone looking is the fact that the cardiac muscle never stops, it cannot, otherwise you would die.
Without any further information about the nature of the mass, the ICD 9 code to use for a cardiac mass would be 429.89.
IV fluids.