🟣 CD4+ T cells are a type of helper T lymphocyte that play a central role in coordinating the immune response.

🟣 They activate other immune cells such as B cells, cytotoxic T cells, and macrophages, making them essential for fighting infections.

🟣 In HIV infection, the virus specifically targets and destroys these CD4+ cells.

🟣 As CD4+ levels decline, the immune system becomes progressively weakened, leading to increased risk of opportunistic infections such as tuberculosis and candidiasis.

🟣 Therefore, the loss of CD4+ T cells directly results in immune suppression and disease progression in HIV.

❌ They act as a reservoir for the HIV virus.

CD4+ cells can be infected by HIV, but their main clinical importance is their role in immune defense, not simply acting as a reservoir.

The question focuses on why they are crucial, not just their involvement in viral persistence.

❌ They are directly targeted by antiretroviral therapy.

Antiretroviral therapy targets viral replication mechanisms, not the CD4+ cells themselves.

The goal is actually to protect and preserve CD4+ cell function.

❌ They are responsible for producing HIV antibodies.

B cells produce antibodies, not CD4+ T cells.

CD4+ cells assist in immune coordination but do not directly produce antibodies.

Why sodium is correct

🟢 In chronic kidney disease, the kidneys lose the ability to regulate sodium and fluid balance effectively, so excess sodium tends to worsen fluid retention and high blood pressure.

🟢 Sodium restriction is important because hypertension and volume overload place extra stress on already damaged kidneys and can speed kidney decline.

🟢 In this client, the urine output is steadily dropping from 50 mL to 20 mL, which suggests worsening kidney clearance. That makes limiting sodium even more important because the body is less able to excrete extra salt and water.

🟢 A low-sodium diet helps reduce edema, cardiovascular strain, and further kidney stress, making it a major part of CKD nutrition therapy.

Why potassium is correct

🔵 The client’s potassium level is critically elevated, rising from 6.0 mmol/L to 6.3 mmol/L, which indicates hyperkalemia.

🔵 The kidneys normally remove excess potassium, so when kidney function declines, potassium can build up in the blood.

🔵 High potassium is dangerous because it can lead to serious heart problems and arrhythmias, which makes potassium restriction one of the most urgent dietary priorities in this case.

🔵 This is why foods high in potassium are often limited in advanced CKD, especially when laboratory values are already above normal like they are here.

🔵 From a revision point of view, when you see CKD + decreased urine output + rising potassium, think restrict potassium to prevent cardiac complications.

Why phosphorus is correct

🟣 The client’s phosphorus is also elevated, increasing from 6.5 mg/dL to 7.1 mg/dL, which is a classic CKD problem because diseased kidneys cannot excrete phosphorus normally.

🟣 High phosphorus is strongly associated with itching in CKD, and this client has severe pruritus, dry skin, and excoriations, which closely fits that pattern.

🟣 The client also has low calcium that is getting worse, from 7.5 mg/dL to 7.2 mg/dL. In CKD, elevated phosphorus often contributes to calcium imbalance and bone problems, which is one more reason phosphorus restriction matters.

🟣 Restricting phosphorus helps reduce mineral imbalance, bone complications, and pruritus, so it is a core part of CKD nutritional therapy.

Why the other options are not the best answers

❌ Iron

❌ Iron is not one of the routine “low intake” nutrients in standard CKD diet teaching. In fact, some CKD clients may need iron support if anemia develops.

❌ Magnesium

❌ Magnesium can matter in some renal situations, but it is not one of the three classic nutrients emphasized in standard CKD dietary restriction teaching. The most recognized trio is sodium, potassium, and phosphorus.

❌ Calcium

❌ Calcium is not the best blank here because the client’s calcium is already low, not high. CKD teaching more commonly focuses on restricting phosphorus, which is one of the reasons calcium balance becomes abnormal.

Clinical connection to this case

🧠 This client’s findings strongly support chronic kidney disease with worsening retention of waste and minerals: declining urine output, severe itching, rising phosphorus, rising potassium, and falling calcium.

🧠 The itching and excoriations point especially toward CKD-associated pruritus, which is commonly linked to retained wastes and mineral imbalance such as high phosphorus.

🧠 The most appropriate dietary teaching in this situation is a renal diet that limits sodium to control fluid and pressure, potassium to reduce arrhythmia risk, and phosphorus to reduce itching and mineral-bone complications.

🔴 In oliguria secondary to chronic kidney disease, the kidneys cannot excrete fluid effectively, leading to fluid retention.

🔴 Daily weights are the most sensitive and accurate indicator of fluid balance, often detecting changes earlier than intake/output records.

🔴 Rapid weight gain reflects fluid overload, which can progress to edema, hypertension, and pulmonary complications.

🔴 Monitoring weight allows early detection and guides fluid restriction and treatment adjustments.

🔴 Therefore, accurate daily weights are the highest priority intervention in managing fluid status in oliguria.

❌ Implement fall precautions

Fall precautions are important for safety but do not address the immediate physiological problem of fluid imbalance.

They are not the priority compared to monitoring life-threatening complications.

❌ Restrict dietary protein

Protein restriction may be part of CKD management but is not the most urgent priority in oliguria.

Fluid status takes precedence over long-term dietary modifications.

❌ Increase oral fluid intake

Increasing fluids in oliguria can worsen fluid overload and complications.

Fluid intake is often restricted, not increased, in this condition.

🟢 Sjögren’s syndrome is an autoimmune disorder that primarily affects exocrine glands, leading to dry eyes (xerophthalmia) and dry mouth (xerostomia).

🟢 The most critical intervention is symptom relief, especially maintaining moisture in the eyes and oral cavity.

🟢 Artificial tears and saliva substitutes help prevent complications such as corneal damage, oral infections, and difficulty swallowing.

🟢 These supportive treatments directly address the underlying gland dysfunction.

🟢 Therefore, maintaining lubrication is the most essential and priority care intervention.

❌ Frequent types of exercise

Exercise may support joint health but does not address the primary gland dysfunction.

It is not the priority intervention for Sjögren’s syndrome.

❌ High protein diet

Protein intake does not stimulate saliva production in this condition.

It does not treat the core symptoms of dryness.

❌ Regular anti-inflammatory medication

Anti-inflammatory drugs may help pain but do not address dry eyes and dry mouth directly.

Lubrication remains the most essential intervention.

Why dietary phosphorus restriction is correct

🟢 This client has elevated phosphorus levels (5.6 → 6.1 mg/dL), which indicates the kidneys are unable to excrete phosphorus effectively.

🟢 In CKD, excess phosphorus contributes to pruritus, hypocalcemia, renal bone disease, and vascular calcification.

🟢 The client’s calcium is also falling (8.2 → 7.9 mg/dL), which supports the classic phosphorus-calcium imbalance seen in kidney disease.

🟢 Restricting foods high in phosphorus reduces phosphate burden and helps prevent worsening mineral and bone complications.

🟢 This is why dietary phosphorus restriction is a major component of CKD management.

Why use of erythropoietin-stimulating agents is correct

🔵 Clients with chronic kidney disease often develop anemia because damaged kidneys produce less erythropoietin, the hormone that stimulates red blood cell production.

🔵 This client reports ongoing fatigue, which is a common manifestation of CKD-related anemia.

🔵 Erythropoietin-stimulating agents (ESAs) help increase red blood cell production and improve oxygen delivery.

🔵 This reduces fatigue, improves functional status, and treats a major complication of CKD.

🔵 Therefore, use of erythropoietin-stimulating agents is an important management strategy.

Why sevelamer administration is correct

🟣 Sevelamer is a phosphate binder, and the provider has specifically prescribed sevelamer 800 mg orally with meals.

🟣 It works by binding phosphorus in the gastrointestinal tract so less phosphorus is absorbed into the bloodstream.

🟣 This helps lower elevated phosphorus levels and supports correction of calcium-phosphorus imbalance.

🟣 Giving it with meals is important because it binds phosphorus from food during digestion.

🟣 This makes sevelamer administration an essential part of this client’s CKD management plan.

Why the other options are incorrect

❌ Daily potassium supplementation

This client already has hyperkalemia (6.0 → 6.3).

Potassium supplementation would worsen the risk of life-threatening dysrhythmias.

❌ Consuming high-protein food sources

High protein intake can increase nitrogenous waste burden and may worsen kidney strain in some CKD clients.

It is not a standard broad management strategy in this context.

❌ Fluid retention promotion

Promoting fluid retention would worsen edema and volume overload.

The provider specifically ordered fluid restriction, showing the opposite is appropriate.

Clinical clues supporting these answers

💎 Fatigue → suggests anemia → supports erythropoietin-stimulating agents

💎 High phosphorus + low calcium → supports phosphorus restriction and sevelamer

💎 Pitting edema + distended abdomen → supports volume concerns, not fluid promotion

💎 Hyperkalemia + metabolic acidosis (bicarbonate 17 → 15) → confirms worsening CKD physiology

🔵 Muscle cramps after hemodialysis are commonly caused by rapid electrolyte shifts that occur during the dialysis process.

🔵 During treatment, changes in sodium, potassium, and fluid balance can alter neuromuscular stability and trigger painful muscle cramping.

🔵 Rapid removal of fluid and solutes can also create shifts in osmolar balance, contributing to cramp development.

🔵 This is a well-recognized complication of hemodialysis, especially when fluid or electrolytes change too quickly.

🔵 Therefore, the nurse should understand electrolyte shifts during dialysis as the primary cause of post-dialysis muscle cramps.

❌ Dehydration prior to dialysis

Dehydration before dialysis is not the primary explanation for cramping that occurs after the treatment session.

The more common cause is dialysis-related fluid and electrolyte shifts.

❌ Increased sodium intake

High sodium intake may affect fluid balance, but it is not the direct primary cause of immediate post-dialysis cramping.

The symptom is more strongly linked to rapid shifts during treatment.

❌ Low calcium intake

Chronic low calcium intake may contribute to other issues, but it does not best explain acute cramps immediately after dialysis.

The stronger direct cause is electrolyte shifts associated with hemodialysis.

🟣 Sympathetic stimulation causes release of norepinephrine, which produces vasoconstriction in the renal circulation.

🟣 This causes constriction of the afferent and efferent arterioles, reducing renal blood flow and glomerular filtration rate (GFR).

🟣 As filtration falls, the kidneys produce less urine, leading to reduced urine output.

🟣 This is a protective response during stress, helping preserve blood flow to vital organs such as the heart and brain.

🟣 Therefore, sympathetic stimulation results in arteriolar constriction with decreased urine output.

❌ Increased GFR due to norepinephrine release

Norepinephrine causes vasoconstriction, not increased filtration.

Sympathetic stimulation decreases rather than increases GFR.

❌ Reduction of blood pressure by decreasing renal blood flow

Decreasing renal blood flow does not primarily function to lower blood pressure here.

Sympathetic activation generally supports blood pressure maintenance, not reduction.

❌ Dilation of afferent arterioles… increase urine output

Sympathetic stimulation causes constriction, not dilation.

It reduces filtration and urine formation rather than promoting it.

🔷 A tacrolimus level above the therapeutic range is a priority finding because tacrolimus has a narrow therapeutic index, meaning even modest elevations can cause significant toxicity.

🔷 Elevated tacrolimus levels increase the risk of serious complications such as nephrotoxicity, neurotoxicity, and other transplant-related adverse effects, so the nurse should not simply watch and wait.

🔷 The safest immediate nursing action is to notify the healthcare provider so the dose can be evaluated, adjusted, or held based on the client’s condition and current trough level.

🔷 Reassessing vital signs may be helpful, but it does not address the medication safety problem as directly as reporting the abnormal drug level.

🔷 The nurse should never give an extra dose when the level is already high, because that could worsen toxicity and threaten graft and patient safety.

❌ Continue to monitor the patient

Monitoring alone is not enough when the tacrolimus level is already above therapeutic range.

The provider needs to be informed promptly so medication changes can be made safely.

❌ Reassess the patient's vital signs

Vital signs are useful, but they do not replace action on a potentially toxic tacrolimus level.

The medication abnormality itself requires provider notification and likely dose adjustment.

❌ Administer an extra dose

Giving more tacrolimus when the level is already elevated is unsafe.

This can increase the risk of drug toxicity and graft complications.

🟢 In a client with HIV, productive cough and fever should make the nurse suspect an opportunistic infection, because weakened immunity increases susceptibility to serious respiratory infections such as bacterial pneumonia and tuberculosis.

🟢 Opportunistic infections are a hallmark of advanced immune suppression in HIV and often present with fever, cough, weight loss, and other infection-related symptoms.

🟢 A respiratory pattern like cough plus fever is much more concerning for infection than the other options listed, which point toward endocrine, musculoskeletal, or nonspecific problems.

🟢 Although some HIV-related opportunistic infections classically cause a nonproductive cough, a productive cough with fever still strongly suggests an infectious complication in an immunocompromised client.

🟢 Therefore, the nurse should recognize productive cough and fever as the most suspicious feature for an opportunistic infection in this client.

❌ Joint stiffness in the morning

Morning joint stiffness is more suggestive of a musculoskeletal or inflammatory disorder.

It is not a classic clue to an HIV-related opportunistic infection.

❌ Weight loss and dry skin

Weight loss can occur in many chronic illnesses, but dry skin does not specifically point to an opportunistic infection.

This combination is less directly suggestive of acute infection than cough with fever.

❌ Heat intolerance and palpitations

Heat intolerance and palpitations are more suggestive of hyperthyroidism or another metabolic condition.

They do not primarily indicate an opportunistic infection in HIV.

🔶 Clients with dementia who are at risk for wandering require interventions focused on safety and early detection of unsupervised movement.

🔶 A bed alarm system alerts staff when the client attempts to get up, allowing prompt intervention before the client wanders or is injured.

🔶 This supports fall prevention, elopement prevention, and rapid response, making it the most effective intervention among the options.

🔶 Clients with dementia often have impaired judgment and may not reliably follow safety instructions, so environmental safety measures are preferred over relying on memory or reasoning.

🔶 Therefore, implementing a bed alarm system best addresses the risk of wandering.

❌ Using complex instructions about risks

Clients with dementia may have impaired cognition and may not understand or retain complex safety instructions.

This does not reliably prevent wandering behavior.

❌ Placing the client's bed next to a window

A window does not reduce wandering risk and may actually increase stimulation or exit-seeking behavior in some clients.

It does not provide active safety monitoring.

❌ Encouraging late evening strolls to tire the client

Fatigue does not reliably prevent wandering and may worsen confusion or sundowning in some clients.

It is not the safest or most direct intervention to manage wandering risk.