N221 Ch18 NCLEX Practice Questions and Answers

Epinephrine, as an adrenergic (sympathomimetic) drug, produces which therapeutic effect? -Urinary retention -Bronchial constriction -Increased heart rate and contractility -Decreased intestinal motility -Increased heart rate and contractility Epinephrine causes sympathomimetic actions, including increased heart rate and contractility. The other effects listed are parasympathomimetic in nature. The physician has ordered dopamine to treat the patient's hypovolemic shock secondary to severe blood loss. For the medication to be effective, the physician must also order -fluid replacement. -beta-stimulating drugs. -antibodies. -fluid restriction. -fluid replacement. Dopamine increases blood pressure secondary to vasoconstriction, which has a limited effect if there is not enough volume within the circulatory system. Your patient is to receive dopamine 5 mcg/kg/min. He weighs 176 lb. You have dopamine 400 mg in 500 mL D5W. You will infuse this at which rate? -20 mL/hr -30 mL/hr -35 mL/hr -50 mL/hr -30 mL/hr The patient's weight of 176 lb is converted to kilograms by dividing 176 by 2.2, which equals 80 kg. 5 mcg/kg/min multiplied by 80 kg equals 400 mcg, or 0.4 mg/min. Dividing 0.4 mg/min by 400 mg/500 mL = 0.5 mL/min, which when multiplied by 60 minutes = 30 mL/hour. When assessing for cardiovascular effects of an adrenergic (sympathomimetic) drug, the nurse understands that these drugs produce -a positive inotropic, positive chronotropic, and positive dromotropic effect. -a positive inotropic, negative chronotropic, and negative dromotropic effect. -a negative inotropic, positive chronotropic, and positive dromotropic effect. -a negative inotropic, negative chronotropic, and negative dromotropic effect. -a positive inotropic, positive chronotropic, and positive dromotropic effect.