Which of the following medications is not categorized as a tocolytic?

Oxytocin (Pitocin)

Magnesium Sulfate

Nifedipine (Procardia)

Indomethacin (Indocin)

Answer and Explanation

The Correct Answer is A

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.

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Correct Answer is A

Explanation

Choice A rationale:

Propylthiouracil (PTU) is a thionamide medication that inhibits the synthesis of thyroid hormones. It is the preferred drug for presurgical treatment of Graves' disease because it effectively lowers thyroid hormone levels and reduces the risk of thyroid storm, a life-threatening complication that can occur during or after surgery.

PTU acts by blocking the enzyme thyroid peroxidase, which is essential for the production of thyroid hormones. It also inhibits the conversion of thyroxine (T4) to triiodothyronine (T3), the more active form of thyroid hormone. This results in a decrease in circulating levels of both T4 and T3, leading to a reduction in the symptoms of hyperthyroidism.

PTU is typically started at a dose of 100-300 mg daily, divided into two or three doses. The dose is then adjusted based on the patient's response and thyroid hormone levels. The goal of treatment is to achieve a euthyroid state, which means that the thyroid hormone levels are within the normal range.

PTU is generally well-tolerated, but it can cause some side effects, including skin rash, itching, nausea, vomiting, abdominal pain, joint pain, and hair loss. In rare cases, it can also cause serious side effects, such as liver damage and agranulocytosis (a decrease in white blood cells).

Choice B rationale:

Liotrix (Thyrolar) is a combination of synthetic T4 and T3 hormones. It is not used for presurgical treatment of Graves' disease because it can worsen the symptoms of hyperthyroidism.

Choice C rationale:

Propranolol (Inderal) is a beta-blocker medication that can be used to control the symptoms of hyperthyroidism, such as tachycardia, tremor, and anxiety. However, it does not lower thyroid hormone levels and is not used for presurgical treatment of Graves' disease.

Choice D rationale:

Levothyroxine sodium (Synthroid) is a synthetic T4 hormone. It is used to treat hypothyroidism, but it is not used for presurgical treatment of Graves' disease.

A. Breakfast B. Supper C. Lunch D. Snack

Correct Answer is A

Explanation

Choice A rationale:

Regular insulin peaks within 2-4 hours after administration. Therefore, to prevent hypoglycemia due to the insulin administered at 0700, the client should eat breakfast within 1-2 hours of insulin administration. This will ensure that there is glucose available in the bloodstream to match the insulin's action and prevent blood sugar levels from dropping too low.

Breakfast is the most important meal of the day, especially for individuals with diabetes. It helps to regulate blood sugar levels throughout the morning and can even help with weight management and overall health.

Skipping breakfast can lead to fluctuations in blood sugar levels and increase the risk of hypoglycemia, especially after insulin administration.

Choice B rationale:

Supper, typically consumed in the evening, would not be timely enough to prevent hypoglycemia due to the 0700 insulin administration. The insulin's peak action would have already subsided by that time, and the client would be at risk for hyperglycemia (high blood sugar) instead.

Choice C rationale:

Lunch, typically consumed around noon, would also be too late to prevent hypoglycemia from the 0700 insulin administration. The insulin's peak action would have already passed, and the client would be more likely to experience hyperglycemia.

Choice D rationale:

A snack, while it can provide some glucose, is not a substitute for a balanced meal like breakfast. Snacks often contain less protein and fiber, which are essential for slowing down glucose absorption and maintaining blood sugar stability. Relying solely on snacks to prevent hypoglycemia is not a reliable strategy for long-term blood sugar management.

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Which of the following medications is not categorized as a tocolytic?

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

A patient with Graves’ disease exhibits symptoms of tachycardia, heat intolerance, and exophthalmos. Which drug is used to alter thyroid hormone levels prior to surgery?

Correct Answer is A

Explanation

The nurse has administered 12 units of regular insulin to a client with type 1 diabetes at 0700. Which meal would prevent the client from experiencing hypoglycemia due to this administration?

Correct Answer is A

Explanation

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