Final answer:
Dobutamine increases myocardial contractility by stimulating beta-1 adrenergice receptors and increasing the influx of calcium ions. It is used in patients with cardiogenic shock to improve cardiac output and blood pressure.
Step-by-step explanation:
Dobutamine is a medication used to increase myocardial contractility. It works by stimulating the beta-1 adrenergic receptors in the heart, leading to an increase in the influx of calcium ions from the extracellular fluid. This increase in intracellular calcium levels enhances the strength of contraction. Dobutamine is commonly used in patients with cardiogenic shock to improve cardiac output and blood pressure.