HESI Pharmacology Practice Exam

Correct Answer B: Releases sodium ions in exchange for primarily potassium ions

Explanation:

B. Releases sodium ions in exchange for primarily potassium ions

Sodium polystyrene sulfonate (Kayexalate) is used to treat hyperkalemia (elevated potassium levels). The medication works by exchanging sodium ions for potassium ions in the gastrointestinal tract. This process helps to lower the levels of potassium in the blood by facilitating its excretion through the stool. This is why the drug is often used for managing dangerous high potassium levels in patients.

Why the Other Options Are Incorrect:

A. Releases bicarbonate in exchange for primarily sodium ions

Kayexalate does not work by releasing bicarbonate in exchange for sodium ions. Instead, it exchanges sodium ions for potassium ions, which helps lower potassium levels. This option misrepresents the mechanism of action of the medication.

C. Releases potassium ions in exchange for primarily sodium ions

This option is incorrect because Kayexalate does not release potassium ions. It works by exchanging potassium ions for sodium ions, allowing potassium to be removed from the body through the gastrointestinal system.

D. Releases sodium ions in exchange for primarily bicarbonate ions

Kayexalate does not release bicarbonate ions in exchange for sodium ions. The primary mechanism of action is the exchange of sodium for potassium, not for bicarbonate. This option does not reflect the correct process.

Summary:

Sodium polystyrene sulfonate (Kayexalate) works by exchanging sodium ions for potassium ions to help reduce potassium levels in the blood, making option B the correct choice. The other options either describe incorrect mechanisms or processes.

Correct answer A: 1

Detailed explanation of the correct answer:

The prescribed dose is increased from 15 mg to 30 mg for the day. The medication is available in 15 mg tablets.

Step 1: The client has already received one 15 mg tablet, so they have taken 15 mg.

Step 2: The total newly prescribed dose is 30 mg.

Step 3: To reach the total prescribed dose of 30 mg, the client needs an additional 15 mg.

Step 4: Since each tablet contains 15 mg, the client needs 1 more tablet.

So, the nurse should administer 1 additional tablet.

Explanation of why the other options are incorrect:

B. 2 tablets would provide 30 mg, which exceeds the prescribed dose.

C. 3 tablets would provide 45 mg, which is too much.

D. 4 tablets would provide 60 mg, which is too much.

Summary:

The nurse should administer 1 additional tablet to ensure the client receives the total newly prescribed dose of 30 mg for the day.

Correct Answer B: Tremors

Explanation of the Correct Answer:

Tremors can be a sign of levothyroxine (Synthroid) toxicity or over-replacement of thyroid hormone. Levothyroxine is used to treat hypothyroidism by supplementing the body's thyroid hormone levels. If the dose is too high, the client may develop symptoms of hyperthyroidism, such as tremors, tachycardia, anxiety, and insomnia. This is why it is essential for the client to notify the healthcare provider if they experience tremors, as it may indicate that the thyroid hormone dosage needs to be adjusted.

Why the Other Options Are Incorrect:

A. Fatigue

Fatigue is more commonly associated with hypothyroidism, which is the condition that levothyroxine treats. When the medication is properly adjusted, fatigue should improve. However, if the fatigue continues, it may require further evaluation, but it is not a specific sign of medication toxicity.

C. Cold intolerance

Cold intolerance is a symptom of hypothyroidism and would indicate that the client’s dose of levothyroxine might need to be adjusted. It is not typically a symptom of levothyroxine toxicity, so the client would not need to notify the HCP for this reason alone. Cold intolerance should improve as the thyroid hormone levels stabilize.

D. Excessively dry skin

Excessively dry skin is also a symptom of hypothyroidism and is not directly related to levothyroxine toxicity. If the dose of levothyroxine is properly adjusted, dry skin should improve. Like cold intolerance, this symptom would not typically require immediate notification to the healthcare provider unless it persists despite appropriate treatment.

Summary:

The nurse should instruct the client to notify the healthcare provider if tremors occur, as this may indicate levothyroxine toxicity or over-replacement of thyroid hormone. Other symptoms such as fatigue, cold intolerance, and dry skin are more likely related to untreated or inadequately treated hypothyroidism rather than levothyroxine overdose.

Correct Answer D: Hyperlipidemia

Explanation:

D. Hyperlipidemia

Garlic is commonly used as a natural remedy to help manage hyperlipidemia, particularly elevated cholesterol levels. Research supports its ability to lower total cholesterol and LDL cholesterol, thus potentially reducing the risk of cardiovascular disease. Garlic has mild lipid-lowering effects, and its use as an herbal supplement is often associated with improving cholesterol levels in individuals with hyperlipidemia.

Why the Other Options Are Incorrect:

A. Eczema

While garlic has anti-inflammatory properties, it is not commonly used as a treatment for eczema. The standard treatments for eczema include topical corticosteroids and moisturizing agents, not garlic. There is limited evidence suggesting garlic’s direct effect on eczema symptoms, making this an unlikely condition that garlic would be used to treat.

B. Insomnia

Garlic is not typically used to treat insomnia. Instead, herbal remedies such as valerian root, chamomile, and lavender are more commonly recommended for sleep issues. Garlic does not have sedative properties and is not recognized for treating insomnia.

C. Migraines

Although garlic has anti-inflammatory properties, it is not primarily used to treat migraines. The common treatments for migraines include medications such as triptans, NSAIDs, and sometimes herbal remedies like feverfew or butterbur, but garlic is not a first-line treatment for this condition.

Summary:

The most likely condition that garlic is used to treat is hyperlipidemia (D), due to its well-documented ability to help lower cholesterol levels. While garlic may have other health benefits, it is not commonly used for conditions such as eczema (A), insomnia (B), or migraines (C).

Correct Answer A: Ensure that the solution is freshly prepared before use.

Explanation:

A. Ensure that the solution is freshly prepared before use.

Sodium hypochlorite (Dakin's solution) is a disinfectant commonly used to cleanse wounds, especially those with purulent drainage, due to its antimicrobial properties. The solution should be freshly prepared or stored properly to maintain its effectiveness. Over time, the antimicrobial activity of sodium hypochlorite decreases, so it is important to use freshly prepared solution or ensure that it is within its expiration date if pre-made. This will ensure it remains effective in reducing infection and promoting wound healing.

Why the Other Options Are Incorrect:

B. Soak a sterile dressing with solution and pack into the wound.

This statement is incorrect. Dakin's solution is not typically used to pack a wound. It is generally used for irrigation and cleansing. Soaking a dressing with Dakin's solution and packing it into the wound may result in excessive exposure to the antiseptic, which could cause tissue irritation or damage. It is more common to irrigate the wound with the solution and then apply a dry or appropriate sterile dressing afterward.

C. Allow the solution to remain in the wound following irrigation.

This statement is incorrect. Dakin's solution should not be left in the wound after irrigation. It is used to irrigate and cleanse the wound, but it is not meant to be retained in the wound. After using the solution for irrigation, the wound should be gently dried and then covered with an appropriate dressing. Leaving the solution in the wound could cause irritation or delay healing.

D. Apply the solution to the wound and on normal skin tissue surrounding the wound.

This statement is incorrect. Dakin's solution should be applied to the wound itself, but it should not be used on normal, healthy skin surrounding the wound. The solution can cause irritation to healthy tissue, and it is best to limit its application to the wound bed to avoid unnecessary damage to the surrounding skin. The surrounding skin should be cleaned with a milder solution if necessary.

Summary:

The correct approach is to ensure that the solution is freshly prepared (A) before using it to cleanse and irrigate the wound. This ensures the solution remains effective in fighting infection. Other methods, such as packing the wound with solution (B), leaving the solution in the wound (C), or applying it to healthy surrounding skin (D), are not recommended due to potential irritation and ineffective wound care practices.

Correct Answer C: A β2 agonist

Explanation:

C. A β2 agonist

During an acute asthma attack, the first-line treatment is typically a β2 agonist, such as albuterol. These medications work quickly to dilate the airways and relieve bronchospasm by stimulating the β2 receptors in the smooth muscle of the airways. This helps to open up the airways and make breathing easier. Short-acting β2 agonists (SABA) are used as rescue inhalers to provide rapid relief during an asthma attack.

Why the Other Options Are Incorrect:

A. Oral corticosteroids

While oral corticosteroids (e.g., prednisone) are used to reduce inflammation in the airways, they take longer to have an effect compared to β2 agonists. Corticosteroids are typically administered after the immediate symptoms have been controlled to prevent the asthma attack from worsening or to reduce inflammation over time. They are not the first choice during an acute attack.

B. A leukotriene modifier

Leukotriene modifiers, such as montelukast, are used for long-term control of asthma and are not effective during an acute asthma attack. They work by blocking the effects of leukotrienes, which contribute to bronchoconstriction and inflammation, but they do not act quickly enough to provide immediate relief during an acute exacerbation.

D. A nonsteroidal anti-inflammatory

Nonsteroidal anti-inflammatory drugs (NSAIDs) are not typically used to treat asthma attacks, and in some cases, they can actually trigger bronchospasm and worsen asthma symptoms. Aspirin and other NSAIDs can cause respiratory issues in some individuals with asthma, and they are not appropriate for managing an acute attack.

Summary:

During an acute asthma attack, the first medication to administer is a β2 agonist (C), as it quickly relieves bronchospasm and helps the child breathe more easily. Other treatments, such as oral corticosteroids (A), leukotriene modifiers (B), and NSAIDs (D), are used for long-term management or in specific situations, but they are not effective for immediate relief during an asthma emergency.

Correct Answer C: Consult with health care providers (HCPs) before receiving immunizations

Explanation:

When a patient is receiving an antineoplastic (chemotherapy) medication, they are often immunocompromised due to the medication's effects on the immune system. Many chemotherapy agents can weaken the immune system, making the patient more vulnerable to infections. As a result, it is crucial for the nurse to instruct the patient to consult with their healthcare provider (HCP) before receiving any immunizations, as live vaccines or certain other vaccines may not be appropriate during chemotherapy. The healthcare provider can guide the patient on which vaccines are safe to receive and when.

Explanation of Incorrect Options:

A. To take aspirin (acetylsalicylic acid) as needed for headache – This is not appropriate advice. Aspirin can increase the risk of bleeding, especially for patients undergoing chemotherapy, as chemotherapy can affect platelet counts and blood clotting. Non-steroidal anti-inflammatory drugs (NSAIDs) like aspirin should generally be avoided during chemotherapy unless specifically prescribed by the healthcare provider.

B. Drink beverages containing alcohol in moderate amounts each evening – Alcohol can interfere with the immune system, increase the risk of liver toxicity, and exacerbate side effects of chemotherapy, such as nausea and fatigue. Patients receiving chemotherapy should avoid alcohol unless specifically cleared by their healthcare provider.

D. That it is not necessary to consult HCPs before receiving a flu vaccine at the local health fair – This is incorrect. As mentioned in option C, patients receiving chemotherapy should consult their healthcare provider before receiving any vaccines, including the flu vaccine. Flu vaccines are typically inactivated (not live), but it is still crucial to consult with the healthcare provider to ensure the vaccine is appropriate for the patient’s current condition and immune status.

Summary:

Patients receiving antineoplastic medications should consult with their healthcare provider before receiving any immunizations due to their compromised immune system. Correct answer: C. Consult with health care providers (HCPs) before receiving immunizations.

Correct Answer C: 11.3 ml/hour

Explanation:

We are given the following information:

Prescribed dose: 5 mcg/kg/min

Client weight: 75 kg

Dobutamine concentration: 0.5 grams in 250 ml

Step 1: Convert dobutamine from grams to micrograms.

1 gram = 1,000,000 mcg, so 0.5 grams = 500,000 mcg.

Step 2: Determine the concentration in mcg/ml.

The concentration is 500,000 mcg in 250 ml.

Concentration (mcg/ml) = 500,000 mcg ÷ 250 ml = 2,000 mcg/ml.

Step 3: Calculate the required dose in mcg/min.

The ordered rate is 5 mcg/kg/min.

Dose (mcg/min) = 5 mcg/kg/min × 75 kg = 375 mcg/min.

Step 4: Calculate the volume required to deliver 375 mcg per minute.

Volume (ml/min) = 375 mcg ÷ 2,000 mcg/ml = 0.1875 ml/min.

Step 5: Convert the rate to ml/hour.

0.1875 ml/min × 60 minutes = 11.25 ml/hour, which rounds to 11.3 ml/hour.

Explanation of Incorrect Options:

A. 10 ml/hour – This would result in a lower dose than prescribed.

B. 11 ml/hour – This would result in a slightly lower dose than required.

D. 12 ml/hour – This would result in a higher dose than prescribed.

Summary:

The nurse should program the infusion pump to deliver 11.3 ml/hour to administer the correct dose. Correct answer: C. 11.3 ml/hour.

Correct Answer B: I should apply a very thin layer to my skin.

Explanation:

B. I should apply a very thin layer to my skin.

This statement is correct. When using tretinoin (Retin-A), it is crucial to apply only a thin layer to avoid excessive irritation or dryness, as tretinoin can be irritating to the skin. Applying a small amount allows for better tolerance and reduces the risk of side effects like peeling, redness, or burning. This is the recommended method for using tretinoin to ensure effectiveness while minimizing discomfort.

Why the Other Options Are Incorrect:

A. Optimal results will be seen after 6 weeks.

This statement is incorrect. The client should be informed that optimal results from tretinoin may take up to 12 weeks or longer to manifest. While improvements may be noticed earlier, full therapeutic benefits usually require consistent use for a longer period.

C. I should wash my hands thoroughly after applying the medication.

This statement is correct. After applying tretinoin, it is important to wash hands thoroughly to prevent the medication from accidentally coming into contact with sensitive areas like the eyes or mouth, where it could cause irritation.

D. I should cleanse my skin thoroughly before applying the medication.

This statement is correct. The skin should be gently cleansed before applying tretinoin to ensure that the medication can work effectively by removing dirt and oil. However, the skin should be allowed to dry completely before application to prevent irritation.

Summary:

The statement, "I should apply a very thin layer to my skin" (B), is correct and reflects the appropriate use of tretinoin. The other options are either correct statements (C, D) or a misconception about the timeline for optimal results (A).