What is the purpose of administering dopamine in patients with low blood pressure after a fluid bolus?

Administering dopamine in patients with low blood pressure after a fluid bolus is primarily aimed at raising blood pressure. Dopamine acts as a vasopressor, stimulating adrenergic receptors to increase cardiac output and vascular tone. When patients experience hypotension, particularly after efforts to optimize fluid status have been made through a fluid bolus, dopamine can help to constrict blood vessels and improve the force of heart contractions. This results in an overall increase in blood pressure, helping to restore perfusion to vital organs and improve hemodynamic stability. By using dopamine in this manner, healthcare providers can effectively manage cases of shock or severe hypotension, particularly in emergency settings.