What is the role of a positive inotropic agent in stroke volume?

A positive inotropic agent is a substance that increases the strength or force of the heart's contraction. By enhancing the contractility of cardiac muscle fibers, these agents enable the heart to pump more blood with each beat. This increase in the force of contraction directly influences stroke volume, which is the amount of blood ejected from the heart with each heartbeat.

When the contractility of the heart is improved, it allows for more blood to be expelled into the circulation, thereby raising stroke volume. This is particularly beneficial in conditions where the heart's pumping capability is compromised. Therefore, the role of a positive inotropic agent is to enhance stroke volume by boosting the contractile force of the heart.