In the case of diastolic dysfunction without systolic dysfunction, fluid resuscitation may, in fact, improve circulation by decreasing heart rate, which will allow the ventricles more time to fill. Even if the patient is edematous, fluid resuscitation may be the first line of treatment if the person's blood pressure is low. The person may, in fact, have too little fluid in their blood vessels, but if the low blood pressure is due to cardiogenic shock, the administration of additional fluid may worsen the heart failure and associated low blood pressure.