Cardiac input (CI) is the inverse operation of cardiac output. As cardiac output implies ejection fraction, cardiac input implies injection fraction (IF).
IF = end diastolic volume (EDV) / end systolic volume (ESV)
Cardiac input is a readily imaged mathematical model of diastole.
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“Family life is not a computer program that runs on its own; it needs continual input from everyone.”
—Neil Kurshan (20th century)