What is Starling’s Law?

In medical science, the term Starling’s Law refers to a theory, which states that “the greater amount of blood volume (preload) into the ventrical of the heart during diastole (the relaxed phase) the greater the amount of blood volume ejected out of the heart during the systolic(contraction phase).”

This becomes clinically significant when a patient does not have enough fluid/blood circulating and as a result the patient’s heart is not being stretched very much as it fills with a limited amount of blood, which results in a proportionately smaller amount of blood ejection fraction (amount of blood ejected by the left ventrical of the heart).