HESI Pharmacology IV Exam

Correct answer A: Whisper test.

Explanation of the correct answer:

Vancomycin is an antibiotic commonly used to treat infections caused by methicillin-resistant Staphylococcus aureus (MRSA). One of the potential adverse effects of vancomycin is ototoxicity, which can lead to hearing loss or tinnitus. The whisper test is a simple bedside assessment used to check for hearing impairment. This test involves the nurse standing behind the client, whispering a word or number, and asking the client to repeat it. If the client has difficulty hearing, it could be an early sign of ototoxicity, and further testing would be necessary to assess hearing function.

Why the other options are incorrect:

B. Romberg test:

The Romberg test is used to assess a person's balance and coordination, primarily in conditions that affect the vestibular system or proprioception. It is not specifically related to vancomycin or its potential adverse effects.

C. Tactile discrimination:

Tactile discrimination assesses the client's ability to distinguish between different types of touch or sensations, which is more related to neurological function. It is not a direct test for potential adverse effects of vancomycin.

D. Skin turgor:

Skin turgor is an assessment used to evaluate hydration status, especially in cases of dehydration. While important in general nursing assessments, it is not specific to the potential adverse effects of vancomycin, which are primarily ototoxicity (hearing loss) and nephrotoxicity (kidney damage).

Summary:

The whisper test is the most appropriate assessment for identifying a potential adverse effect (ototoxicity) of vancomycin, particularly in clients who are receiving high doses or prolonged therapy. Ototoxicity is a serious complication of vancomycin, and early detection can help prevent permanent hearing damage.

Correct answer  C: Blood pressure

Explanation of the correct answer:

C. Blood pressure

Cyclosporine (Sandimmune, Gengraf, Neoral) is an immunosuppressant used in postrenal transplant patients to prevent organ rejection. One of the common side effects of cyclosporine is hypertension (increased blood pressure). If the nurse observes a rise in blood pressure and the client reports a headache, this could be indicative of cyclosporine-induced hypertension. Elevated blood pressure is a known side effect of the medication, and it is important to monitor blood pressure regularly in these clients.

Why the other options are incorrect:

A. Pulse

While pulse may be elevated in some conditions, cyclosporine is more commonly associated with hypertension rather than changes in heart rate. A headache in this context is more likely due to high blood pressure, not an elevated pulse.

B. Respirations

Respirations are not commonly affected by cyclosporine. The medication primarily affects renal function and blood pressure, and respiratory changes are not typically observed as a primary side effect of cyclosporine therapy.

D. Pulse oximetry

Pulse oximetry measures oxygen saturation in the blood and is generally used to assess respiratory function. Cyclosporine does not typically cause significant changes in oxygen saturation, so it would not be the most likely vital sign to increase in this scenario.

Summary:

An increase in blood pressure is the most likely vital sign change in a postrenal transplant client taking cyclosporine. Headache is a common symptom of hypertension, which can be induced by cyclosporine. Therefore, the nurse should closely monitor the client's blood pressure when they are on this medication.

Correct answer  B: Acts directly on the skeletal muscle to relieve spasticity

Explanation of the correct answer:

B. Acts directly on the skeletal muscle to relieve spasticity

Dantrolene sodium (Dantrium) is a muscle relaxant that works by inhibiting calcium release from the sarcoplasmic reticulum in muscle cells, which reduces muscle contraction and helps to relieve spasticity. By acting directly on the skeletal muscle, it reduces the frequency and severity of muscle spasms associated with conditions like spinal cord injury, cerebral palsy, and stroke, as well as malignant hyperthermia. This action helps to decrease muscle stiffness and spasticity, improving the client’s mobility and comfort.

Why the other options are incorrect:

A. Depresses spinal reflexes

While some muscle relaxants work by affecting spinal reflexes (e.g., baclofen), dantrolene does not act in this manner. It does not primarily affect spinal reflexes but works directly on the muscle itself to reduce spasticity.

C. Acts within the spinal cord to suppress hyperactive reflexes

This description more closely applies to baclofen, which acts on the spinal cord to inhibit reflexes. In contrast, dantrolene works directly on the skeletal muscles rather than within the spinal cord.

D. Acts on the central nervous system (CNS) to suppress spasms

Dantrolene does not primarily act on the CNS. Medications like baclofen or tizanidine act on the CNS to suppress spasms, whereas dantrolene acts directly on skeletal muscles by interfering with calcium release within the muscle fibers, thereby preventing muscle contraction.

Summary:

Dantrolene sodium relieves spasticity by acting directly on the skeletal muscle, reducing excessive muscle contraction. This makes option B the correct response. The other options refer to mechanisms of action that are more characteristic of other muscle relaxants, like baclofen.

Correct Answer C: Hypokalemia, hyperglycemia, sulfa allergy

Explanation of the Correct Answer:

C. Hypokalemia, hyperglycemia, sulfa allergy

Hydrochlorothiazide (HydroDIURIL) is a thiazide diuretic, commonly used to treat conditions such as hypertension and edema. The primary concerns related to this medication include:

Hypokalemia: Thiazide diuretics like hydrochlorothiazide increase the excretion of potassium in the urine, which can lead to low potassium levels (hypokalemia). This can cause symptoms such as muscle weakness, cramping, and arrhythmias.

Hyperglycemia: Hydrochlorothiazide can also impair glucose metabolism, leading to elevated blood sugar levels (hyperglycemia), which is particularly concerning for patients with diabetes or those at risk for diabetes.

Sulfa allergy: Hydrochlorothiazide is a sulfonamide-based drug, and patients with a sulfa allergy may experience hypersensitivity reactions, such as rashes, fever, or even more severe reactions like Stevens-Johnson syndrome.

Why the Other Options Are Incorrect:

A. Hypouricemia, hyperkalemia

Hypouricemia (low uric acid levels) is not typically a concern with hydrochlorothiazide. Instead, thiazide diuretics can cause hyperuricemia, which may increase the risk of gout attacks.

Hyperkalemia (high potassium levels) is also not commonly associated with thiazide diuretics. In fact, thiazide diuretics are more likely to cause hypokalemia due to potassium excretion.

B. Increased risk of osteoporosis

While chronic use of thiazide diuretics may slightly reduce calcium excretion, leading to a small protective effect on bone density, osteoporosis is not a significant concern associated with hydrochlorothiazide. This is not one of the primary risks.

D. Hyperkalemia, hypoglycemia, penicillin allergy

Hyperkalemia is not associated with hydrochlorothiazide, as it tends to cause hypokalemia instead.

Hypoglycemia is not typically caused by hydrochlorothiazide. However, hyperglycemia is a concern (as mentioned above).

A penicillin allergy is not directly relevant to hydrochlorothiazide therapy, as this is unrelated to sulfonamide-based drugs.

Summary:

The primary concerns when administering hydrochlorothiazide (HydroDIURIL) are hypokalemia, hyperglycemia, and the possibility of a sulfa allergy. Regular monitoring of potassium levels and blood glucose is essential to prevent complications in patients on thiazide diuretics.

Correct Answer B: Refrigerate the insulin

Explanation of the Correct Answer:

B. Refrigerate the insulin is correct because unopened vials of insulin should be stored in the refrigerator at a temperature between 36°F and 46°F (2°C to 8°C). This ensures the insulin remains stable and maintains its potency until it is ready for use. Insulin should never be frozen, as freezing can destroy its effectiveness. Once opened, the insulin can be kept at room temperature for up to 28 days.

Why the other options are incorrect:

A. Freeze the insulin is incorrect because insulin should never be frozen. Freezing insulin can cause it to lose its effectiveness and potentially damage the insulin molecules. If insulin has been frozen, it should not be used, and a new vial should be obtained.

C. Store the insulin in a dark, dry place is incorrect because while insulin should be kept out of direct sunlight and heat, refrigeration is necessary for unopened vials. Storing it in a dark, dry place at room temperature is suitable for opened insulin, but it does not apply to unopened vials, which need to be refrigerated to preserve their integrity.

D. Keep the insulin at room temperature is incorrect for unopened vials. Unopened insulin should be stored in the refrigerator. However, once the vial has been opened, it can be kept at room temperature for up to 28 days to make it more comfortable to inject.

Summary:

Unopened insulin vials should be refrigerated to maintain their stability and potency until they are ready to be used. Freezing insulin, storing it in a dark, dry place, or keeping it at room temperature before opening are not appropriate for the preservation of unopened insulin.

Correct Answer A: Prednisone

Explanation of the Correct Answer:

A. Prednisone is correct because prednisone is a steroid medication that can cause hyperglycemia as a side effect. Corticosteroids like prednisone can increase blood glucose levels by promoting gluconeogenesis (the production of glucose from non-carbohydrate sources) in the liver and by decreasing insulin sensitivity. This is especially important for individuals with diabetes mellitus, as their blood sugar control may worsen with the use of corticosteroids, potentially leading to higher fasting blood glucose levels.

Why the other options are incorrect:

B. Phenelzine (Nardil) is incorrect because phenelzine is a monoamine oxidase inhibitor (MAOI) used to treat depression. While MAOIs can interact with certain foods and medications, they are not typically associated with causing hyperglycemia. The primary side effects of phenelzine are related to its impact on neurotransmitter levels, not on blood sugar regulation.

C. Atenolol (Tenormin) is incorrect because atenolol is a beta-blocker used to treat hypertension and angina. While beta-blockers can mask the symptoms of hypoglycemia, they do not typically cause hyperglycemia. However, beta-blockers may make it more difficult for individuals with diabetes to detect low blood sugar levels.

D. Allopurinol (Zyloprim) is incorrect because allopurinol is used to treat gout by reducing uric acid levels. It is not associated with hyperglycemia. The primary side effects of allopurinol involve rash and gastrointestinal symptoms, but it does not typically affect blood glucose levels in diabetic patients.

Summary:

Prednisone, a corticosteroid, is the medication most likely to contribute to hyperglycemia in a client with diabetes. It increases blood glucose levels by decreasing insulin sensitivity and increasing glucose production in the liver. The other medications listed do not typically have an impact on blood glucose levels.

Correct answer B: The white blood cell counts and platelet counts

Explanation of the correct answer:

B. The white blood cell counts and platelet counts

Etanercept (Enbrel) is a tumor necrosis factor (TNF) inhibitor used in the treatment of rheumatoid arthritis and other autoimmune disorders. While effective in reducing inflammation and slowing disease progression, etanercept suppresses the immune system, making the client more susceptible to infections and hematologic abnormalities, including leukopenia (low white blood cells) and thrombocytopenia (low platelets).

It is critical for the nurse to monitor complete blood counts (CBC) regularly during therapy. A decrease in white blood cells can increase the risk of serious infections, while a drop in platelets can increase the risk of bleeding. These lab values provide an early warning for potentially severe adverse effects and guide decisions about continuing or adjusting the medication.

Why the other options are incorrect:

A. The injection site for itching and edema

While mild injection site reactions such as redness, itching, or swelling are common and expected with subcutaneous administration of etanercept, they are not the most critical concern. These reactions are usually self-limiting and manageable with symptomatic care.

C. Whether the client is experiencing fatigue and joint pain

Fatigue and joint pain are symptoms of rheumatoid arthritis, not necessarily side effects of etanercept. While it's useful to monitor the client’s clinical response to treatment, these symptoms are not as urgent or serious as hematologic complications.

D. A metallic taste in the mouth, with a loss of appetite

These symptoms are not typical or significant side effects of etanercept. They are more commonly associated with medications like metronidazole or chemotherapy drugs, not TNF inhibitors.

Summary:

Monitoring white blood cell and platelet counts is most important when administering etanercept, due to the risk of immunosuppression and hematologic abnormalities. While local injection reactions and joint symptoms may occur, they are less critical than potentially life-threatening changes in blood counts.

Correct Answer C: Liver enzyme levels.

Explanation of the Correct Answer:

C. Liver enzyme levels

Isoniazid (INH) is a medication commonly used in the treatment of tuberculosis. It is known to potentially cause hepatotoxicity, which can lead to liver damage. Before initiating treatment with INH, the nurse must ensure that liver enzyme levels (such as AST, ALT, and bilirubin) have been assessed to establish a baseline and to monitor for any signs of liver toxicity during treatment. This is a critical step because liver function tests help in detecting early signs of liver damage and guide further management of the medication.

Why the Other Options Are Incorrect:

A. Electrolyte levels

While monitoring electrolyte levels is important for certain medications, it is not a priority baseline test for a client starting INH therapy. INH does not commonly cause electrolyte disturbances that would require baseline testing. The primary concern with INH is its potential for liver toxicity, which is why liver enzyme levels are more important.

B. Coagulation times

Coagulation tests (such as PT/INR) are typically monitored in patients taking anticoagulant therapy or those with liver dysfunction affecting vitamin K metabolism. INH does not generally affect coagulation directly, so this is not the baseline study required for starting INH therapy.

D. Serum creatinine level

A serum creatinine level is usually assessed to evaluate renal function, but renal toxicity is not a primary concern with INH. INH's main side effect is hepatotoxicity, so monitoring liver enzyme levels is the most relevant baseline study.

Summary:

Before starting isoniazid (INH) therapy for tuberculosis, it is essential to complete liver enzyme tests to establish a baseline for liver function, as the medication has the potential to cause hepatotoxicity. Monitoring liver function is critical throughout the treatment to detect any early signs of liver damage.

Correct answer C: Serum creatinine

Explanation of the correct answer:

C. Serum creatinine

Foscarnet is an antiviral medication used to treat cytomegalovirus (CMV) retinitis and other viral infections, particularly in immunocompromised patients, such as those with acquired immunodeficiency syndrome (AIDS). One of the most important side effects of foscarnet is nephrotoxicity (kidney damage), which can result in elevated serum creatinine levels. Therefore, it is crucial to monitor serum creatinine regularly to assess kidney function and prevent renal complications while the client is on foscarnet therapy.

Why the other options are incorrect:

A. CD4 cell count

While monitoring CD4 cell count is important in managing HIV/AIDS, it is not the most urgent parameter to monitor for a client taking foscarnet. The primary concern with foscarnet therapy is renal function, so serum creatinine is more critical in this context.

B. Serum albumin

Serum albumin is an indicator of nutritional status and liver function, but it is not directly related to the nephrotoxic effects of foscarnet. Serum creatinine is the more relevant lab value for monitoring the client’s renal function during foscarnet therapy.

D. Lymphocyte count

The lymphocyte count is part of the immune status of the client and is important for monitoring the progression of HIV/AIDS. However, it is not specifically related to the renal toxicity associated with foscarnet, which is why it is not the priority laboratory value to check for clients on this medication.

Summary:

The nurse should monitor serum creatinine in a client receiving foscarnet due to the potential risk of nephrotoxicity. This is the most critical laboratory test for assessing renal function and preventing complications while on foscarnet therapy.