RN Pharmacology BSN 315

Correct Answer:Hypotension

Explanation of the correct answer:

Nifedipine (Procardia) is a calcium channel blocker (CCB) that works by relaxing the smooth muscles of blood vessels, leading to vasodilation and a reduction in blood pressure. When combined with nitrate therapy, which also causes vasodilation, the risk of hypotension (low blood pressure) increases significantly. This is because both medications lower blood pressure through vessel relaxation, making hypotension the most common and clinically significant side effect that the nurse should monitor for. Signs of hypotension may include dizziness, lightheadedness, fainting, and weakness.

Why the other options are incorrect:

 Hyperkalemia

Hyperkalemia (high potassium levels) is not a typical side effect of nifedipine or nitrate therapy. Hyperkalemia is more commonly associated with medications such as potassium-sparing diuretics or ACE inhibitors.

Hypokalemia

Hypokalemia (low potassium levels) can occur with loop or thiazide diuretics, but nifedipine and nitrates do not significantly affect potassium levels.

Seizures

 Seizures are not a common side effect of nifedipine or nitrate therapy. While severe hypotension could theoretically reduce brain perfusion, leading to confusion or syncope, seizures are not typical in this context.

Summary:

For a client taking nifedipine (Procardia) along with nitrate therapy, the nurse's priority is to monitor for hypotension due to the combined vasodilatory effects of these medications. Hypotension is the most common and important side effect in this setting, while potassium imbalances and seizures are not expected complications of this treatment regimen.

Correct Answer: Naloxone hydrochloride, also known as Narcan.

Explanation 

Naloxone hydrochloride is the antidote specifically used to reverse opioid overdose. It is an opioid antagonist, which means it works by competitively binding to the same opioid receptors in the central nervous system that opioids like morphine, heroin, fentanyl, and others activate. When opioids occupy these receptors in high amounts, they depress the respiratory center, causing slowed or stopped breathing, decreased consciousness, stupor, and eventually coma and death if not treated. Naloxone rapidly displaces opioids from these receptors, reversing respiratory depression, sedation, and hypotension caused by opioid toxicity. It is the first-line treatment when a client presents with signs of opioid overdose, including stupor or coma, pinpoint pupils, and respiratory depression.

Why the Other Options Are Incorrect:

Atropine sulfate, is incorrect because atropine is an anticholinergic medication. It is primarily used to treat bradycardia, or a dangerously slow heart rate, and to reduce secretions during surgery. It has no effect on opioid receptors or opioid-induced respiratory depression. Therefore, it is not used in opioid overdose situations.

Vitamin K, is incorrect because Vitamin K is used as the antidote for excessive anticoagulation caused by warfarin, which is a blood thinner. It helps promote the production of clotting factors to reverse bleeding tendencies in that context. It does not interact with opioids or treat opioid overdose symptoms, so it is not appropriate in this situation.

 Romazicon, which is the brand name for flumazenil, is incorrect because flumazenil is a benzodiazepine antagonist. It is specifically used to reverse the sedative effects of benzodiazepines like diazepam, lorazepam, or midazolam. Since opioids are a different class of drugs than benzodiazepines, flumazenil is ineffective against opioid toxicity and would not benefit the client in this case.

Summary:

When a client in the emergency department is suspected of overdosing on opioids and exhibits signs of severe central nervous system depression, such as stupor or coma, the nurse should immediately prepare to administer naloxone hydrochloride. This medication is the antidote to opioid overdose because it works by blocking opioid receptors, thereby reversing life-threatening symptoms. Other medications such as atropine sulfate, vitamin K, and flumazenil are used for different types of overdoses or conditions and have no effect on reversing opioid toxicity. Therefore, naloxone hydrochloride is the only correct answer.

Correct Answer: Patient taking metolazone (Zaroxolyn)

Explanation:

Metolazone (Zaroxolyn) is a thiazide-like diuretic that can cause hypokalemia (low potassium levels). Digoxin (Lanoxin) has a narrow therapeutic index, meaning that small changes in blood levels can cause toxicity. Low potassium levels increase the risk of digoxin toxicity, which can lead to life-threatening arrhythmias, nausea, vomiting, and visual disturbances. Therefore, the nurse should be concerned about administering digoxin to a patient taking metolazone and should monitor potassium levels closely before giving the medication.

Why the Other Options Are Incorrect:

Patient taking spironolactone (Aldactone) 

Spironolactone is a potassium-sparing diuretic, meaning it helps retain potassium rather than depleting it. While high potassium levels (hyperkalemia) can also be problematic, the risk of digoxin toxicity is more concerning with low potassium levels, which metolazone can cause.

Apical pulse of 68 beats/minute

Before administering digoxin, the nurse should check the apical pulse and hold the medication if the pulse is below 60 beats per minute due to the risk of bradycardia. However, a pulse of 68 beats per minute is within the normal range and would not be a contraindication for administering digoxin.

 Normal serum sodium level 

Serum sodium levels do not directly affect digoxin toxicity. While electrolyte imbalances in general can influence cardiac function, potassium levels are the primary concern when monitoring for digoxin toxicity.

Summary:

Digoxin toxicity is a serious concern, especially in patients with low potassium levels. Metolazone, a diuretic, increases the risk of hypokalemia, which can make digoxin more toxic. The nurse should monitor potassium levels before giving digoxin in this case. Other factors, such as a normal heart rate and normal sodium levels, are not immediate concerns for administering digoxin.

Correct Answer: Wheezing, hypotension, and AV block.

Explanation

Wheezing, hypotension, and AV block:

These are serious adverse effects associated with beta-adrenergic blockers such as propranolol (Inderal).

Wheezing can occur because beta blockers may cause bronchoconstriction, especially in people with asthma or chronic obstructive pulmonary disease (COPD).

Hypotension is a common side effect of beta blockers because they reduce heart rate and cardiac output.

AV block refers to a delay or interruption in the conduction of electrical impulses between the atria and ventricles, which can be caused by the negative chronotropic (slows heart rate) and dromotropic (slows conduction) effects of beta blockers. It can be dangerous if severe.

Why Other Options are Incorrect

As needed:

Controlled-release oxycodone (such as OxyContin) is designed to release the medication slowly over time. It is not typically used on an "as-needed" basis because it maintains a consistent level of medication in the bloodstream over a prolonged period. "As needed" is more appropriate for immediate-release formulations.

Vomiting, dilated pupils, and papilledema:

These symptoms are not typically associated with beta-adrenergic blockers. Vomiting might occur in some cases, but it is not a common or serious adverse effect. Dilated pupils and papilledema (swelling of the optic disc) are more likely to be seen in conditions such as increased intracranial pressure, not with beta blockers.

Tinnitus, muscle weakness, and tachypnea:

 These symptoms are not typical serious adverse effects of beta blockers. Tinnitus and muscle weakness are not commonly associated with propranolol, and tachypnea (rapid breathing) is not typically seen with beta blockers, which may actually slow the respiratory rate due to their effects on the heart.

Summary:

Serious adverse effects of beta-adrenergic blockers like propranolol (Inderal) include wheezing (due to bronchoconstriction), hypotension, and AV block. These effects can be life-threatening and should be monitored carefully.

Correct Answer: Oral taken drugs dissolve in the gut and are not one hundred percent absorbed, unlike when administered as an IV.

Explanation

The best explanation for why the oral (PO) dose of an opioid is higher than the IV dose relates to the concept of bioavailability. Bioavailability is the proportion of a drug that enters the bloodstream to have an active effect. When a medication is given intravenously (IV), it is delivered directly into the bloodstream, so bioavailability is one hundred percent. However, when taken orally, drugs must go through the digestive system and the liver before entering the bloodstream. This process is called first-pass metabolism, and it significantly reduces the amount of active drug that reaches systemic circulation. As a result, oral doses need to be higher than IV doses to achieve the same therapeutic effect. This is very common with opioids and many other medications. So, the most accurate and appropriate response is the one explaining the difference in absorption and metabolism between oral and IV administration

Why the Other Options Are Incorrect:

 A higher dose of analgesic medication may be needed after discharge.

This is not accurate because the higher dose is not due to being discharged or because the patient is at home. The difference in the dose is related to the route of administration, not the setting of care.

 An error in the dose calculation may have occurred when the prescribed dose was converted.

While medication errors are always possible, it is not appropriate to suggest a possible error to the patient without evidence. In reality, the increased oral dose is expected and normal due to pharmacokinetics.

 The doses should be the same unless the pain is not well controlled.

This is incorrect. The doses of the same medication vary by route because of differences in absorption and metabolism, regardless of pain levels.

Summary:

The oral dose of an opioid is higher than the IV dose because oral medications undergo first-pass metabolism in the liver and are not fully absorbed into the bloodstream. IV medications, by contrast, are delivered directly into circulation, requiring smaller doses to achieve the same effect. Therefore, the most correct response is the one explaining these differences in bioavailability. 

Correct Answer: Hypokalemia.

Explanation 

 Hypokalemia (low potassium levels) is the most critical finding that the nurse should report before a procedure involving a neuromuscular blocking agent. Neuromuscular blocking agents (such as succinylcholine or vecuronium) work by interfering with the transmission of signals at the neuromuscular junction, causing temporary paralysis during procedures like intubation or surgery. When a client has hypokalemia, they are at increased risk for:

Prolonged muscle paralysis

Increased sensitivity to neuromuscular blockers, meaning the drug may work more strongly or last longer than intended

Cardiac arrhythmias, which can be life-threatening, especially when combined with medications that affect muscle and nerve function

Because of these risks, hypokalemia should always be corrected before administering neuromuscular blockers, and the healthcare provider must be informed immediately.

Why the Other Options Are Incorrect:

Hyponatremia (low sodium levels)

While hyponatremia can cause neurological symptoms such as confusion, seizures, and weakness, it is not as directly dangerous in the context of neuromuscular blockers as hypokalemia. It still needs to be corrected, but it is not the most immediate threat regarding neuromuscular blockade.

Hypercalcemia (high calcium levels)

Hypercalcemia can cause muscle weakness, kidney issues, and altered mental status, but it does not significantly potentiate or interfere with neuromuscular blockers in the same acute and dangerous way that hypokalemia does.

 Hypomagnesemia (low magnesium levels)

Hypomagnesemia can also cause muscle weakness, tremors, and arrhythmias, but its effect on neuromuscular blockade is less direct compared to hypokalemia. While it is important, it is not as immediately concerning as hypokalemia in this specific setting.

Summary:

Before administering a neuromuscular blocking agent, the nurse must ensure electrolyte levels are within safe limits to prevent complications. Hypokalemia is the most dangerous in this context because it increases the risk of prolonged paralysis and life-threatening arrhythmias. Therefore, the nurse should report hypokalemia to the healthcare provider immediately before proceeding.

Correct Answer:Anaphylactic

Explanation

The patient is most likely experiencing an anaphylactic reaction, which is a Type One hypersensitivity reaction. Anaphylaxis is a severe, immediate, and potentially life-threatening allergic reaction that occurs when the immune system overreacts to an allergen, such as certain medications like sulfamethoxazole (Bactrim). Key signs of anaphylaxis include:

Difficulty breathing due to airway swelling and bronchoconstriction

Flushed face from vasodilation

Back pain, which may be associated with muscle spasms or generalized discomfort from the systemic reaction

Other symptoms may include hives, low blood pressure, rapid heartbeat, and swelling of the lips, tongue, or throat

These symptoms occurring shortly after IV medication administration are hallmark signs of anaphylaxis. Immediate interventions are needed, such as stopping the infusion, calling for emergency assistance, and administering epinephrine along with oxygen and antihistamines.

Why the Other Options Are Incorrect:

Cytotoxic: Cytotoxic reactions are Type Two hypersensitivity reactions. These involve the immune system attacking specific cells, leading to issues like hemolytic anemia or thrombocytopenia. They do not cause sudden respiratory distress, flushing, or back pain immediately after drug administration.

Serum sickness: Serum sickness is a Type Three hypersensitivity reaction. It is delayed, often occurring one to two weeks after exposure to a medication or antiserum. It presents with symptoms like fever, joint pain, rash, and swollen lymph nodes, not acute breathing difficulty or facial flushing.

Infectious:. An infectious reaction is not a hypersensitivity reaction. It refers to a reaction caused by an actual infection from pathogens like bacteria or viruses. The symptoms described in the question do not suggest an infection but an acute allergic response.

Summary:

The correct answer is anaphylactic, as the patient is displaying classic, rapid-onset symptoms of anaphylaxis following IV administration of sulfamethoxazole (Bactrim). These include difficulty breathing, flushed face, and back pain. The other options describe different types of immune responses or unrelated conditions that do not match the acute, life-threatening allergic reaction seen here. Immediate action is necessary to treat anaphylaxis.

Correct Answer: Digoxin immune fab

Rationale:

Digoxin immune fab (Digibind or DigiFab) is the specific antidote for digitalis toxicity. It is an antibody fragment that binds to digoxin molecules in the bloodstream, neutralizing their effects and enhancing their elimination from the body. This is used in cases of severe digoxin toxicity, such as:

Life-threatening arrhythmias

Severe hyperkalemia (high potassium levels) associated with digoxin toxicity

Altered mental status or hemodynamic instability

Why the Other Options Are Incorrect

"Digitalis glycoside"

Digitalis glycosides (such as digoxin) are the cause of toxicity, so giving more would worsen the condition rather than treat it.

"Spironolactone (Aldactone)" 

Spironolactone is a potassium-sparing diuretic often used in heart failure to reduce fluid retention and block aldosterone. However, it does not counteract digoxin toxicity. In fact, since it retains potassium, it could worsen hyperkalemia, which is a potential complication of digoxin toxicity.

"Amiodarone (Cordarone)"

Amiodarone is an antiarrhythmic drug used to treat atrial and ventricular arrhythmias. While digoxin toxicity can cause arrhythmias, amiodarone can actually increase digoxin levels, making toxicity worse instead of better.

Summary

The correct answer is Digoxin immune fab, as it is the specific antidote for digitalis toxicity. The other options are incorrect because digitalis glycosides would worsen toxicity, spironolactone does not neutralize digoxin, and amiodarone can increase digoxin levels, worsening the condition.

Correct Answers:

Avoid drinking alcohol while taking this medication.

Use condoms until treatment is completed.

Ensure that all sexual partners are treated at the same time.

Explanation:

 Avoid drinking alcohol while taking this medication. 

Metronidazole (Flagyl) has a severe interaction with alcohol, causing a disulfiram-like reaction, which can lead to nausea, vomiting, flushing, tachycardia, and hypotension. The nurse must advise the client to avoid alcohol during treatment and for at least 48 hours after completing the medication.

Use condoms until treatment is completed. 

Trichomonas vaginalis is a sexually transmitted infection (STI), and reinfection can occur if the client has unprotected intercourse before treatment is completed. Condoms should be used consistently until both the client and their partner(s) have completed treatment to prevent reinfection.

Ensure that all sexual partners are treated at the same time. 

All sexual partners must be treated simultaneously to prevent reinfection. If only one partner is treated, the infection may persist and be transmitted back and forth.

Why the Other Options Are Incorrect:

Increase fluid intake, especially cranberry juice. 

Incorrect because cranberry juice is often recommended for urinary tract infections (UTIs), not trichomoniasis. While staying hydrated is beneficial, cranberry juice does not specifically enhance metronidazole effectiveness or treat trichomoniasis.

Do not abruptly discontinue the medication; taper use. 

Incorrect because metronidazole does not require tapering. The client should complete the full course of medication to ensure eradication of the infection, but no gradual dose reduction is needed.

Check blood pressure daily to detect hypertension. 

Incorrect because metronidazole does not cause hypertension. Blood pressure monitoring is not a necessary part of treatment.

Summary:

The nurse should instruct the client to avoid alcohol, use condoms until treatment is finished, and ensure that all sexual partners are treated to prevent reinfection. Cranberry juice, blood pressure monitoring, and tapering the medication are not relevant to metronidazole treatment.