For which of the following patients would the RN anticipate an order for sodium bicarbonate IVP?

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.

Choice A rationale:

Oxytocin is a hormone that stimulates uterine contractions. It is not a tocolytic, which is a medication that inhibits uterine contractions. In fact, oxytocin is often used to induce labor or to augment labor that is progressing slowly.

It acts on the myofibrils in the uterine muscle, causing them to contract more forcefully and frequently. This leads to cervical dilation and effacement, and ultimately to the birth of the baby.

Oxytocin is typically administered as an intravenous (IV) infusion. The dosage is carefully titrated to achieve the desired effect on the uterus.

It is important to note that oxytocin can have serious side effects, including uterine hyperstimulation, fetal distress, and postpartum hemorrhage. Therefore, it should only be used under the close supervision of a healthcare provider.

Choice B rationale:

Magnesium sulfate is a tocolytic that is often used to prevent preterm labor. It works by relaxing the smooth muscle of the uterus.

It is typically administered as an IV infusion. The dosage is carefully monitored to ensure that the magnesium level in the blood does not become too high.

Side effects of magnesium sulfate can include flushing, nausea, vomiting, and headache. In rare cases, it can also cause serious complications such as respiratory depression and cardiac arrest.

Choice C rationale:

Nifedipine is a calcium channel blocker that is sometimes used as a tocolytic. It works by relaxing the smooth muscle of the uterus and blood vessels.

It is typically administered as an oral tablet. Side effects of nifedipine can include headache, dizziness, flushing, and low blood pressure.

Choice D rationale:

Indomethacin is a nonsteroidal anti-inflammatory drug (NSAID) that is sometimes used as a tocolytic. It works by inhibiting the production of prostaglandins, which are substances that promote uterine contractions.

It is typically administered as an oral tablet or suppository. Side effects of indomethacin can include nausea, vomiting, heartburn, and diarrhea.