RN Pharmacology BSN 315

Correct Answer: Instruct the laboratory to draw the trough immediately before the next scheduled dose.

Explanation of the correct answer:

The trough level measures the lowest concentration of the antibiotic in the patient's bloodstream, which helps to ensure that drug levels stay above the minimum effective concentration but below toxic levels. The best time to draw a trough level is immediately before the next scheduled dose of the antibiotic. This timing accurately reflects the lowest drug concentration and ensures proper therapeutic monitoring.

Why the other options are incorrect:

Give the dose of medication, and call the laboratory to draw the trough STAT.

This is incorrect. Drawing the trough after giving the medication would not show the lowest level of the drug in the bloodstream. After administration, the drug levels rise, so this timing would measure a peak or random level, not the trough.

Arrange for the laboratory to draw the trough 1 hour after the dose is given.

This is incorrect. Drawing a level 1 hour after administration typically reflects a peak level, which measures the highest concentration of the drug, not the trough.

Give the first dose of medication after the laboratory reports that the trough has been drawn.

This is incorrect. A trough level is only drawn after the medication has been repeatedly administered and has reached a steady state. It is not required before the first dose, because there would be no drug in the system yet to measure.

Summary:

To accurately measure the trough level of an antibiotic, the nurse should ensure that the blood sample is drawn immediately before the next dose is given. This timing reflects the lowest concentration of the drug in the body and helps determine if the dosage and timing are appropriate for maintaining safe and effective therapeutic levels.

Correct Answer: Tachycardia and chest pain.

Explanation:

Thyroid hormone toxicity, also known as hyperthyroidism, can occur if the client is receiving too much thyroid replacement hormone after thyroidectomy. The excessive thyroid hormone can cause the body to go into an overactive metabolic state, leading to several symptoms associated with heart and cardiovascular stress. Tachycardia (rapid heart rate) and chest pain are concerning symptoms of thyroid hormone toxicity and could indicate a serious cardiovascular issue, such as arrhythmias or angina, both of which require prompt medical attention. These symptoms could potentially lead to more severe outcomes like a heart attack or other complications if not addressed.

Why Other Options Are Incorrect:

Tinnitus and dizziness

These symptoms are more commonly associated with other issues, such as inner ear problems, or side effects from medications like aspirin or diuretics. While dizziness can be a sign of many conditions, it is not a hallmark of thyroid hormone toxicity, and tinnitus is unlikely to be a direct result of thyroid hormone overuse.

Dry skin and intolerance to cold

These symptoms are more commonly seen in hypothyroidism (underactive thyroid), not hyperthyroidism. They are opposite to what you would expect in thyroid hormone toxicity, where symptoms typically include increased metabolism, weight loss, sweating, and heat intolerance.

Weight gain and increased appetite

These symptoms are also more consistent with hypothyroidism, where metabolic processes slow down, leading to weight gain and an increased appetite. In thyroid hormone toxicity, symptoms would typically include weight loss, increased appetite, and sometimes diarrhea due to the accelerated metabolism.

Summary:

The nurse should instruct the client to report tachycardia and chest pain to the healthcare provider immediately, as these symptoms are indicative of thyroid hormone toxicity and could signal serious cardiovascular problems. Other symptoms like dry skin, intolerance to cold, weight gain, and increased appetite are more associated with hypothyroidism and not an overuse of thyroid hormone.

Correct Answer: Drink eight glasses of fluid a day.

Explanation

Sulfasalazine (Azulfidine) is an anti-inflammatory medication commonly prescribed for ulcerative colitis. One of the most important instructions for clients taking sulfasalazine is to increase fluid intake, specifically to drink at least eight glasses of water daily. This is essential because sulfasalazine is metabolized into sulfa components, which can crystallize in the kidneys and urinary tract, potentially leading to crystalluria, kidney stones, or urinary obstruction. Adequate hydration helps to flush the urinary system and prevent these complications.

Why the other options are incorrect:

Maintain good oral hygiene.

While good oral hygiene is always beneficial, it is not specific or the most critical instruction for clients on sulfasalazine. This medication does not have a primary side effect that impacts the oral cavity to make this a priority teaching point.

Take the medication 30 minutes before a meal.

This is not necessary with sulfasalazine. In fact, sulfasalazine is often taken with food or after meals to help reduce gastrointestinal irritation, which can be a common side effect. Taking it on an empty stomach can increase GI upset, so this option is inaccurate.

Discontinue use of the drug gradually.

For sulfasalazine, there is no need for gradual discontinuation. However, it is critical not to stop the medication abruptly without consulting a healthcare provider, as this may cause a flare-up of ulcerative colitis symptoms, but gradual tapering is not a requirement like it is with medications such as corticosteroids.

Summary:

The most important discharge instruction for a client prescribed sulfasalazine (Azulfidine) is to drink at least eight glasses of fluid daily to prevent kidney complications and promote urinary health. The other options, while generally good practices, do not address the key risks associated with this medication, making hydration the priority teaching point.

Correct Answer: Notify the healthcare provider.

Explanation:

Celecoxib (Celebrex) is a nonsteroidal anti-inflammatory drug (NSAID) that belongs to the class of COX-2 inhibitors. It contains a sulfonamide group in its chemical structure, so a client with a sulfa allergy is at risk for an allergic reaction to this medication. It is crucial to notify the healthcare provider before administering the drug, as they may decide to prescribe an alternative medication that is safer for the client.

Why the other options are incorrect:

Review the client's hemoglobin results

While reviewing lab results is important in some cases, it is not directly relevant to assessing the risk of an allergic reaction to celecoxib in this situation. The primary concern here is the client’s allergy to sulfa.

 Inquire about the reaction to sulfa 

While it's important to know the specifics of the client’s allergy (e.g., severity, symptoms), this action is secondary to notifying the healthcare provider. The priority is to inform the healthcare provider so they can decide on an alternative treatment.

Record the client's vital signs 

Vital signs should be monitored regularly, but this is not the immediate priority in this case. The first priority is to ensure the medication is safe for the client to take given their sulfa allergy.

Summary:

The most important action is to notify the healthcare provider, as celecoxib contains a sulfonamide group that could trigger an allergic reaction in a client with a sulfa allergy. The healthcare provider may need to prescribe a different medication.

Correct Answer: Activated partial thromboplastin time (aPTT)

Explanation

Heparin is an anticoagulant commonly used to prevent and treat blood clots. The most important laboratory value to check before administering heparin is the activated partial thromboplastin time (aPTT). The aPTT measures the effectiveness of the intrinsic pathway of coagulation and helps determine if the client is at risk of bleeding due to over-anticoagulation. Heparin therapy is carefully adjusted based on the aPTT results to ensure therapeutic levels are reached without causing bleeding complications. Although routine low-dose subcutaneous heparin (for prophylaxis) often does not require regular aPTT monitoring, higher doses or therapeutic use of heparin typically do. The nurse must always verify whether aPTT monitoring is required for that specific client's heparin regimen before administration.

Why the other options are incorrect:

Heart rate

While assessing vital signs like heart rate is generally good practice, heart rate is not the key parameter that reflects the safety or effectiveness of heparin therapy. It does not provide direct information about the client's coagulation status.

Urinary output

Monitoring urinary output is important for overall assessment of renal function and fluid balance, but it is not directly related to heparin administration or its anticoagulant effects.

Prothrombin time (PT) and international normalized ratio (INR)

PT and INR are used to monitor warfarin (Coumadin) therapy, not heparin. These values measure the extrinsic pathway of coagulation, and checking them before giving heparin would not provide useful information regarding heparin's anticoagulant effect.

Summary:

Before administering heparin, the most important parameter to check is the activated partial thromboplastin time (aPTT) to ensure that the client is within a safe therapeutic range and to reduce the risk of excessive bleeding.

Other vital signs and lab values are important for general monitoring, but aPTT is specific and crucial for heparin safety and efficacy.

Correct Answer: Protect the skin from sunlight while taking the drug.

Explanation 

Tetracycline, including tetracycline HCl, is an antibiotic known to cause photosensitivity, which increases the risk of severe sunburn or skin damage when the skin is exposed to sunlight. Therefore, it is important to advise the client to protect their skin from sunlight by wearing sunscreen, protective clothing, or avoiding prolonged sun exposure while taking the drug.

Why the other options are wrong:

Take with orange juice to enhance absorption:

Tetracycline should not be taken with dairy products, antacids, or substances that contain calcium, iron, or magnesium, as these can bind to the drug and reduce its absorption. While orange juice might seem like a good option due to its vitamin C content, it is not recommended because citrus juices (including orange juice) can also interfere with absorption, albeit to a lesser extent. It is best to take tetracycline with water on an empty stomach.

Take with milk or antacids to prevent gastrointestinal (GI) irritation:

Milk and antacids can interfere with the absorption of tetracycline because they contain minerals (such as calcium, magnesium, and aluminum) that bind to the drug. The combination can significantly reduce the effectiveness of tetracycline. The medication should be taken on an empty stomach, 1 hour before or 2 hours after meals, for optimal absorption.

 Return to the clinic weekly to obtain serum drug levels:

Tetracycline does not require routine monitoring of serum drug levels. This instruction would be more relevant for certain other medications that require therapeutic drug level monitoring (such as digoxin or phenytoin), but tetracycline does not fall into this category. Therefore, weekly clinic visits for serum drug levels are unnecessary.

Summary:

When teaching a client prescribed tetracycline HCl, the nurse should instruct them to protect their skin from sunlight (Option a) due to the risk of photosensitivity. The drug should not be taken with milk, antacids, or orange juice, and routine monitoring of serum drug levels is not necessary.

Correct Answer: Nonpolyvinylchloride (non-PVC) plastic intravenous bags and tubing must be used.

Explanation

Nonpolyvinylchloride (non-PVC) plastic intravenous bags and tubing must be used. Nitroglycerin can be absorbed by polyvinyl chloride (PVC) materials, reducing the drug’s potency. To prevent loss of effectiveness, it must be administered using non-PVC plastic intravenous bags and special tubing. Using PVC tubing can lead to decreased vasodilation, making the medication less effective in treating myocardial infarction (MI).

Explanation of the Incorrect Answers:

Nitroglycerin can be given in the same line as other medications

Nitroglycerin should not be mixed with other medications unless compatibility is confirmed. Mixing it with incompatible drugs can cause precipitation, reduced effectiveness, or increased risk of adverse reactions.

There is not a continuous intravenous form; nitroglycerin is given 

This statement is false because nitroglycerin is commonly given as a continuous intravenous infusion. IV nitroglycerin is frequently used for acute coronary syndromes, hypertensive crises, and heart failure.

The nitroglycerin solution will be slightly colored green or blue 

Nitroglycerin solutions are typically clear. If the solution appears green or blue, it may be contaminated or degraded and should not be used.

Summary:

The correct answer is Nonpolyvinylchloride (non-PVC) plastic intravenous bags and tubing must be used because PVC can absorb nitroglycerin, reducing its effectiveness. The other options are incorrect because nitroglycerin should not be mixed with other medications, there is a continuous IV form, and the solution should be clear, not green or blue.

Correct Answer:  Probiotics

Probiotics are the best choice for treating short-term persistent diarrhea because they help restore the natural balance of gut bacteria, which can be disrupted due to infections, antibiotic use, or dietary changes. Probiotic supplements containing Lactobacillus, Bifidobacterium, or Saccharomyces boulardii can help regulate bowel movements, reduce diarrhea duration, and improve overall gut health.

Why the Other Options Are Incorrect

Lubricants – Incorrect

Lubricants, such as mineral oil, are primarily used as laxatives to prevent constipation rather than to treat diarrhea. They work by coating the stool and intestinal walls to ease stool passage but do not help with diarrhea.

Adsorbents – Incorrect

Adsorbents, such as bismuth subsalicylate (Pepto-Bismol) and activated charcoal, help bind toxins and bacteria in the gut. While they can be useful for some cases of diarrhea, they do not specifically address the root cause of diarrhea related to gut flora imbalance.

Anticholinergics – Incorrect

Anticholinergics, such as atropine and hyoscyamine, work by slowing down gut motility and reducing intestinal spasms. While they may be used for chronic diarrhea due to irritable bowel syndrome (IBS) or other conditions, they are not the first-line treatment for short-term diarrhea and can have side effects like dry mouth, urinary retention, and constipation.

Summary

The correct answer is Probiotics because they help restore the natural gut flora, which is essential in resolving short-term persistent diarrhea caused by infections, antibiotics, or dietary issues. The other options are incorrect because lubricants are used for constipation, adsorbents bind toxins but do not restore gut flora balance, and anticholinergics reduce intestinal motility but are not the first-line treatment for this type of diarrhea.

Correct Answer: Are you having difficulty hearing?

Explanation of the Correct Answer:

 Are you having difficulty hearing? is the correct answer because gentamicin sulfate (Garamycin) is an aminoglycoside antibiotic known to cause ototoxicity as a serious side effect. Ototoxicity refers to damage to the inner ear, leading to hearing loss, tinnitus (ringing in the ears), or balance problems. The risk of ototoxicity increases with higher doses, prolonged therapy, or preexisting hearing problems. Before starting gentamicin therapy, it is essential for the nurse to assess the client’s baseline hearing and inquire about any history of hearing loss, ringing in the ears, or balance issues. If the client reports any current or past hearing problems, the prescriber must be notified because gentamicin could worsen or cause permanent hearing damage. Monitoring hearing function during therapy is also necessary.

 Why the Other Options Are Wrong:

Have you ever been diagnosed with cancer?

While a cancer history is important in general health assessments, it is not directly relevant to the use of gentamicin. Gentamicin does not have any specific contraindications or interactions related to a cancer diagnosis. The primary concerns with gentamicin involve kidney function and hearing, not oncology history.

 Do you have any type of diabetes mellitus? 

Although diabetes mellitus can contribute to kidney disease, which is another concern with gentamicin (since it is also nephrotoxic), the more direct and priority question before starting therapy is about hearing, due to the risk of irreversible hearing loss. While diabetes status is important and may be part of the broader health assessment, it is not the priority screening question specific to gentamicin initiation.

 Have you ever had anemia? 

Anemia is unrelated to gentamicin therapy. Gentamicin does not typically affect red blood cells or hemoglobin levels, nor does anemia increase the risk of gentamicin-related toxicity. This question does not help assess any specific risk associated with this medication.

Summary:

The correct answer is Are you having difficulty hearing? because gentamicin sulfate carries a serious risk of ototoxicity, which can result in permanent hearing damage. It is critical to check for any baseline hearing issues before starting therapy. The other options are incorrect because a history of cancer, diabetes, or anemia does not have a direct or priority connection to the safety concerns specific to gentamicin use. Recognizing the ototoxic risk of gentamicin ensures appropriate precautions and monitoring to protect the client's hearing health.