A patient with congestive heart failure and pulmonary edema is experiencing chest pain.
The patient has been prescribed morphine sulfate IV 4 mg every 5-30 minutes as needed until chest pain subsides.
The last dose of 4 mg was administered 15 minutes ago, and the patient is still complaining of chest pain and showing signs of increased respiratory effort.
The nurse observes a heart rate of 82 beats per minute, a respiratory rate of 18 breaths per minute, and a blood pressure of 135/88 mm Hg. What should the nurse do next?

Choice A rationale:

Requesting an order for morphine sulfate IV 2 mg over 1-5 minutes would not be appropriate at this time for several reasons: The patient has already received a dose of 4 mg 15 minutes ago, and it has not been effective in relieving the chest pain.

The patient is showing signs of increased respiratory effort, which could be a sign of respiratory depression. Administering an additional dose of morphine could worsen the respiratory depression.

The patient's heart rate is 82 beats per minute, which is within the normal range.

The patient's blood pressure is 135/88 mm Hg, which is also within the normal range.

Choice C rationale:

Administering naloxone (Narcan) to counteract respiratory depression would not be appropriate at this time because the patient is not showing signs of severe respiratory depression. Naloxone is a medication that is used to reverse the effects of opioid overdose. It is typically only used in situations where the patient is experiencing life-threatening respiratory depression.

Choice D rationale:

Administering morphine sulfate IV 4 mg over 1-5 minutes would not be appropriate for the reasons listed above. It could worsen the patient's respiratory depression and potentially lead to other complications.

Choice B is the best answer because it is the most conservative and safest option. By withholding the next dose of morphine and informing the provider about the patient's symptoms, the nurse can ensure that the patient receives the appropriate care and that any potential complications are avoided.

Choice A rationale:

Dopamine is a catecholamine that acts on both alpha- and beta-adrenergic receptors. It has inotropic (increases heart contractility), chronotropic (increases heart rate), and vasopressor (constricts blood vessels) effects.

It was previously used as a first-line agent for cardiogenic shock, but it has fallen out of favor due to concerns about its potential to increase heart rate and arrhythmias, which can worsen myocardial oxygen demand and ischemia.

Additionally, dopamine's effects on renal blood flow can be unpredictable, and it may not be as effective as norepinephrine in increasing blood pressure in patients with severe shock.

Choice B rationale:

Norepinephrine is a potent alpha-adrenergic agonist that causes vasoconstriction, leading to an increase in blood pressure. It has minimal beta-adrenergic effects, so it does not significantly increase heart rate.

Norepinephrine is the preferred first-line vasopressor for cardiogenic shock because it effectively raises blood pressure without significantly increasing heart rate or myocardial oxygen demand.

It also has beneficial effects on renal blood flow and may improve organ perfusion.

Choice C rationale:

Epinephrine is a potent alpha- and beta-adrenergic agonist. It has strong inotropic, chronotropic, and vasopressor effects.

It can be used in cardiogenic shock, but it is typically reserved for patients who do not respond adequately to norepinephrine or who have severe bradycardia.

Epinephrine's potent beta-adrenergic effects can increase heart rate and myocardial oxygen demand, which can be detrimental in patients with cardiogenic shock.

Choice D rationale:

Vasopressin (Pitressin) is a hormone that acts on V1 receptors in vascular smooth muscle to cause vasoconstriction. It is not a first-line agent for cardiogenic shock, but it can be used as an adjunct to norepinephrine in patients who are refractory to other vasopressors.

Vasopressin may be particularly useful in patients with septic shock, as it has been shown to improve outcomes in this population.