Acute Renal Failure Nursing Care Plans

Acute renal failure is fast, dangerous, and often missed. Most clients have no symptoms tied to the kidneys and get caught only on a routine blood panel, so your monitoring is what flags trouble before it becomes a code. This guide covers what to watch, what to do, and why it matters at the bedside.

What is Acute Renal Failure?

Acute renal failure (ARF), also called acute kidney failure or acute kidney injury (AKI), is the abrupt loss of kidney function. The glomerular filtration rate (GFR) drops over hours to a few days, with a matching rise in serum creatinine and urea nitrogen. Right after a kidney insult, BUN and serum creatinine may still read normal. Early on, decreased urine output is sometimes the only sign. Left untreated, ARF can progress to chronic renal failure.

AKI falls into three categories. Prerenal is an adaptive response to severe volume depletion and hypotension, with structurally intact nephrons. Intrinsic follows cytotoxic, ischemic, or inflammatory insults, with actual structural and functional damage. Postrenal comes from obstruction to urine passage.

The annual incidence in the United States is 100 cases per million people. It is diagnosed in 1% of hospital admissions, develops within 30 days postoperatively in roughly 1% of general surgery cases, and arises in more than 50% of ICU clients.

Most clients have no AKI-specific symptoms and are diagnosed on a routine lab. Depending on the degree and duration of impairment, they may show hypertension, edema, decreased urine output, shortness of breath, anorexia, nausea, sleep disturbance, and altered mental status. Prognosis tracks the cause, the presence of preexisting kidney disease, and how long dysfunction ran before treatment.

Nursing Care Plans and Management

Your goals are to promote renal function, correct or eliminate reversible causes, and provide supportive care. That means managing fluid and electrolyte imbalances, optimizing nutrition, keeping medications safe, supporting the client emotionally, and teaching self-care and prevention.

Nursing Problem Priorities

1. Assess and monitor renal function.
2. Manage fluid and electrolyte balance.
3. Identify and treat the underlying cause.
4. Prevent and manage complications such as electrolyte imbalances and metabolic acidosis.
5. Monitor and manage fluid overload or dehydration.
6. Maintain hemodynamic stability and blood pressure control.
7. Teach self-care and adherence to the treatment plan.

Nursing Assessment

Assess for the following subjective and objective data:

• Decreased urine output or oliguria
• Swelling or edema in the hands, feet, or face
• Fatigue and weakness
• Shortness of breath or difficulty breathing
• Nausea, vomiting, or loss of appetite
• Confusion or altered mental status
• Abdominal pain or discomfort
• High blood pressure
• Irregular heart rhythm or palpitations
• Signs of fluid overload

Assess for factors related to the cause of ARF:

• Compromised regulatory mechanism (renal failure)
• Fluid overload (kidney dysfunction, overzealous fluid replacement)
• Fluid shifts or fluid deficit from excessive losses
• Electrolyte imbalance (potassium, calcium); severe acidosis
• Uremic effects on cardiac muscle and oxygenation
• Protein catabolism; dietary restriction of nitrogenous waste
• Increased metabolic needs
• Anorexia, nausea, vomiting, oral mucosa ulcerations
• Depressed immunologic defenses secondary to uremia
• Invasive procedures and devices such as urinary catheterization
• Changes in dietary intake or malnutrition
• Excessive fluid loss during the diuretic phase, with rising urinary volume and delayed return of tubular reabsorption

Nursing Goals

Goals and expected outcomes may include:

• The client will display appropriate urinary output with specific gravity and lab studies near normal; stable weight; vital signs within their normal range; and no edema.
• The client will maintain cardiac output, shown by BP and HR/rhythm within normal limits, strong equal peripheral pulses, and adequate capillary refill.
• The client will maintain or regain weight appropriate to their situation, free of edema.
• The client will show no signs or symptoms of infection.
• The client will display I&O near balance, good skin turgor, moist mucous membranes, palpable peripheral pulses, stable weight, and vital signs and electrolytes within normal range.

Nursing Interventions and Actions

1. Managing Fluid Volume and Hypervolemia

In prerenal AKI, fluid resuscitation is the gold standard. Push it past the correction of hypovolemia and you trade one problem for worse morbidity, mortality, and length of stay, plus added AKI risk. Fluid overload correlates with mortality in critically ill clients across ARDS, acute lung injury, sepsis, and AKI.

Assess level of consciousness and investigate restlessness or changes in mentation. These reflect fluid shifts, toxin accumulation, acidosis, electrolyte imbalance, or developing hypoxia. Older adults with vague mental status change often turn out to have prerenal or normotensive ischemic AKI. Suspect insensible losses driving severe hypovolemia in clients with restricted fluid access and in those who are comatose or sedated.

Assess skin, face, and dependent areas for edema; grade it on a +1 to +4 scale. Edema settles in dependent tissue first (hands, feet, lumbosacral area). A client can gain up to 10 lb (4.5 kg) of fluid before pitting edema shows. Periorbital edema is often the first sign because those fragile tissues distend with minimal fluid.

Monitor HR, BP, and JVD/CVP. Tachycardia and hypertension show up from failure to excrete urine, excess fluid during resuscitation, or shifts in the renin-angiotensin system. Invasive monitoring may be needed to assess intravascular volume, especially with poor cardiac function. Heart failure clients can run a low BP yet carry volume excess with poor renal perfusion, which itself drives AKI.

Auscultate lung and heart sounds. Fluid overload produces pulmonary edema and heart failure, heard as adventitious breath sounds and extra heart sounds. Cardiovascular and volume status are the most important parts of the exam. Watch for murmurs, pericardial friction rub, increased JVD, rales, and S3 gallops.

Record I&O accurately, including hidden fluids (IV additives, liquid meds, frozen treats, ice chips) and all GI and insensible losses (sweating, wound drainage, nasogastric output, diarrhea). The KDIGO definition of AKI rests on the change in serum creatinine and a urine output below 0.5 mL/kg/hour for 6 hours. Accurate I&O drives fluid replacement and reduces overload risk. Oliguria favors AKI; abrupt anuria suggests acute obstruction, acute severe glomerulonephritis, or embolic renal artery occlusion; gradually falling output points to a stricture or bladder outlet obstruction.

Monitor urine specific gravity. This measures the kidney's ability to concentrate urine. In intrarenal failure, specific gravity is usually at or below 1.010, signaling lost concentrating ability. Aggressive fluid resuscitation fits prerenal AKI, but in a client with ATN who cannot excrete the extra fluid, it causes volume overload and respiratory compromise.

Weigh daily at the same time, on the same scale, in the same clothing. Daily weight is the best monitor of fluid status. A gain over 0.5 kg/day suggests fluid retention. Over-aggressive volume resuscitation causes tissue congestion and hypoxia and is tied to worse survival in ICU and AKI populations.

Monitor diagnostic studies (Hgb, hct, sodium, potassium, BUN, creatinine, urine sodium), serial chest x-rays, and echocardiography as indicated. See Laboratory and Diagnostic Procedures.

Scatter desired beverages across the 24-hour period and vary the offerings (hot, cold, frozen). This avoids long gaps without fluids and cuts the sense of deprivation and thirst. Black coffee beats coffee with high-potassium, high-phosphorus milk or high-calorie sugar drinks. Unsweetened green tea and plain carbonated water are reasonable choices.

Maintain volume homeostasis and correct biochemical abnormalities. Kidneys may return to normal, preventing or limiting residual damage. Correct fluid overload and severe acidosis, and address hematologic abnormalities with transfusions and medications.

Use safety measures such as raised side rails. Clients with CNS involvement may be dizzy or confused. Acute kidney injury affects up to half of critically ill clients and is strongly tied to morbidity and mortality, and acute brain dysfunction (delirium or coma) is common in the same population with its own adverse outcomes.

Administer or restrict fluids as indicated. Replace output from all sources plus estimated insensible losses. Prerenal azotemia is treated with volume expansion or vasopressors. The oliguric client with adequate or excess circulating volume who fails fluid restriction and diuretics needs dialysis. During the oliguric phase, push/pull therapy (push IV fluids, diurese with diuretics) may be tried, but rapid infusion can cause life-threatening overload.

Assist with the passive leg-raising (PLR) maneuver or virtual fluid challenge. PLR predicts whether cardiac output will rise with volume. Shifting about 300 mL of venous blood from the lower body to the right heart mimics a fluid challenge without giving fluid.

Promote sodium and fluid restriction as indicated. Restriction is crucial in oliguric kidney failure, where the kidneys clear neither toxins nor fluids well. Restrict oliguric clients to 400 mL plus the previous day's urine output unless there are signs of volume depletion.

Insert an indwelling catheter as indicated. Catheterization rules out lower tract obstruction and allows accurate hourly output, though it may be contraindicated by infection risk. It also lets you diagnose and treat urethral and bladder outlet obstruction.

Administer furosemide, vasodilators, and calcium channel blockers as indicated. See Pharmacologic Management.

Prepare for dialysis as indicated: hemodialysis, peritoneal dialysis, or continuous renal replacement therapy (CRRT). Dialysis corrects volume overload, electrolyte and acid-base imbalances, and removes toxins. Type depends on hemodynamic compromise and the client's tolerance. Hemodialysis can delay recovery; most prefer biocompatible membrane dialyzers. Peritoneal dialysis is used less often but is tolerated better hemodynamically.

Assist in renal replacement therapy. The main methods are intermittent hemodialysis, continuous venovenous hemodiafiltration, and peritoneal dialysis. Continuous RRT costs more, carries higher bleeding risk, and is not universally available, but it avoids hypotension and gives better uremia control and solute clearance.

2. Minimizing Risk of Cardiac Complications

When the kidneys cannot offload excess fluid, volume builds and the heart's workload climbs while cardiac output drops. Electrolyte imbalances pile on, disrupting electrical activity and contractility.

Monitor BP and HR. Volume excess plus the hypertension and uremia of renal failure raises cardiac workload and can drive cardiac failure, which is usually reversible in ARF. Vital signs are real indicators of kidney damage. As damage worsens, temperature and respiratory rate rise while BP and pulse shift.

Watch ECG or telemetry for rhythm changes. Toxin accumulation and electrolyte shifts change electromechanical function. Peaked T waves, wide QRS, and prolonged PR interval point to hyperkalemia. Flat T waves, peaked P waves, and U waves point to hypokalemia. A prolonged QT interval reflects calcium deficit.

Auscultate heart sounds. S3/S4 signals failure. A pericardial friction rub may be the only sign of uremic pericarditis and demands prompt intervention, possibly acute dialysis.

Assess skin, mucous membrane, and nail bed color and capillary refill. Pallor reflects vasoconstriction or anemia; AKI suppresses RBC production. Cyanosis is a late sign tied to pulmonary congestion or cardiac failure as fluid backs up into the lungs.

Note slow pulse, hypotension, flushing, nausea, vomiting, and depressed consciousness. Magnesium-containing antacids can cause hypermagnesemia, worsening neuromuscular dysfunction and risking respiratory or cardiac arrest; use an aluminum-hydroxide-based antacid instead. Hypovolemia drives hypotension, but hypotension does not always mean hypovolemia.

Monitor for GI bleeding by guaiac testing all stools. See Laboratory and Diagnostic Procedures.

Investigate muscle cramps, finger numbness, muscle twitching, and hyperreflexia. These neuromuscular signs of hypocalcemia also impair cardiac contractility. Severe hypocalcemia causes tetany, with involuntary contraction of the hands and feet.

Monitor potassium, calcium, and magnesium. See Laboratory and Diagnostic Procedures.

Maintain bed rest or adequate rest and assist with care and desired activities. Rest lowers heart rate, oxygen consumption, and cardiac workload, letting the heart pump more efficiently.

Encourage relaxation techniques and better sleep quality. Lowering stress hormones reduces the heart rate and BP spikes that cut cardiac output, and good sleep supports cardiac repair.

Administer or restrict fluids as indicated. Cardiac output depends on circulating volume and myocardial function. Hypovolemia potentiates every form of AKI, and rapid reversal often treats it, but rapid infusion can cause life-threatening overload.

Provide supplemental oxygen if indicated. This maximizes oxygen for myocardial uptake and reduces cardiac workload and cellular hypoxia.

Administer medications (inotropic agent, calcium gluconate, aluminum hydroxide gels, insulin, sodium bicarbonate, and sodium polystyrene sulfonate with or without sorbitol) as indicated. See Pharmacologic Management.

Prepare for or assist with dialysis as needed. Indicated for persistent dysrhythmias and progressive heart failure unresponsive to other therapy. KDIGO recommends a kt/v of 3.9 per week with intermittent or extended RRT and an effluent volume of 20 to 25 mg/kg/hour with CRRT.

Prepare the client for echocardiography. Echocardiography guides resuscitation in critically ill clients and assesses fluid responsiveness, since reversing organ dysfunction often requires IV fluids.

3. Promoting Optimal Nutritional Balance

Malnutrition is common in AKI and independently predicts in-hospital mortality. Requirements vary widely between clients, and nutrition support has to account for the metabolic consequences of renal failure, the underlying disease, and any imbalances introduced by RRT.

Assess and document dietary intake. This flags deficiencies and needs. Uremic symptoms (nausea, anorexia) and dietary restrictions cut intake, and multiple organ failure complicates support.

Weigh daily. A fasting or catabolic client normally loses 0.2 to 0.5 kg/day; changes above 0.5 kg reflect fluid shifts. Obesity raises AKI risk, yet obese clients often have a survival benefit over underweight or normal-weight clients. A BMI of 31 kg/m² or higher carries mortality as high as a low body weight (BMI under 18 kg/m²).

Measure energy requirements. These are set by the underlying disease, not renal failure itself. Use indirect calorimetry when available; it calculates heat production from gas exchange, measuring oxygen consumed and carbon dioxide produced to estimate resting calorie needs.

Perform a general nutritional assessment and screen for malnutrition. Appetite loss carries the strongest prognostic weight among nutrition-related symptoms. The Renal iNUT screening tool was developed for hospitalized AKI and CKD clients. Assessment should cover history, unintentional weight loss or reduced performance before admission, physical exam, and body composition, muscle mass, and strength.

Assess lean body mass, muscle mass, and function. Prefer body composition assessment over anthropometry. Critically ill clients lose skeletal muscle fast in the first ICU days, so monitoring matters; assess muscle function by hand-grip strength.

Monitor BUN, albumin, transferrin, sodium, potassium, and phosphorus. These guide nutritional needs and therapy. Renal function is critical to electrolyte balance, and severe electrolyte and acid-base disorders are key indicators for RRT. One UK report found one-fifth of in-hospital AKI was avoidable with better electrolyte monitoring, risk recognition, and prompt management.

Provide frequent, small feedings. This minimizes the anorexia and nausea of a uremic state and reduced peristalsis. Trophic feeding (10 to 20 kcal/hour or up to 500 kcal/day) reduced GI intolerance, insulin use, and glucose levels compared with full feeding in acute lung injury. Whether early low-energy versus full-energy feeding affects mortality remains debated, but trophic feeding cuts GI intolerance.

Give the client or caregiver a list of permitted foods and fluids and involve them in menu choices. This restores a measure of control within restrictions, and food from home can boost appetite. Salt and fluid restriction stays crucial in oliguric kidney failure.

Offer frequent mouth care, or rinse with 10% hydrogen peroxide for stomatitis; provide gum, hard candy, and breath mints between meals. Xerostomia tracks the volume status of clients told to limit fluids. One-third of hemodialyzed clients have a characteristic halitosis ("uremic fetor") and metallic taste from high salivary urea breaking down into ammonia. For uremic stomatitis, gargling with 10% hydrogen peroxide 4 times a day promotes healing.

Consult the dietitian. Salt and fluid restriction is vital, and clients with renal dysfunction should avoid a high-potassium diet. The dietitian sets calorie and nutrient needs and the best route (oral, enteral, or parenteral).

Include complex carbohydrates and fat to meet caloric needs and essential amino acids; avoid concentrated sugar. Carbohydrates meet energy needs and limit catabolism, preventing keto acid formation. Essential amino acids improve nitrogen balance, stimulate tubular epithelial repair, and support resistance to complications. Standard formulas run high in carbohydrate calories, which may not suit clients with kidney failure.

Provide a high-calorie, low- to moderate-protein diet. Protein need depends on the underlying disease, catabolism, and treatment type. Because hypoalbuminemia worsens effective hypovolemia and mortality, supply enough protein to maintain serum albumin and immune function. Do not restrict protein just to slow the BUN rise or delay dialysis, and increase intake during RRT.

Maintain electrolyte balance through strict monitoring. A falling GFR and certain medications cause imbalances that can worsen injury. Urine electrolytes indicate tubular function; the fractional excretion of sodium (FENa) is the common indicator and helps detect extreme renal sodium avidity in conditions like hepatorenal syndrome.

Restrict potassium, sodium, and phosphorus as indicated. Because these are not excreted well in AKI, blood levels tend to run high. Restrict them, especially when dialysis is not part of treatment and during the recovery phase, guided by frequent measurements.

Administer medications (iron preparations, calcium carbonate, selenium, vitamin C, and folic acid) as indicated. See Pharmacologic Management.

Provide enteral or parenteral nutrition as indicated. Per 2019 ESPEN and 2016 ASPEN guidelines, start enteral or parenteral nutrition within 24 to 48 hours of ICU admission in high-risk clients. Early enteral nutrition lowered mortality versus late. Add parenteral nutrition if, after 7 to 10 days, enteral nutrition cannot meet 60% of energy requirements.

Maintain serum glucose between 140 to 180 mg/dL. Clients risk both hyper- and hypoglycemia. Insulin resistance is common in AKI and raises mortality risk, and because the kidney metabolizes insulin, impaired function predisposes to hypoglycemia.

4. Promoting Infection Control and Minimizing Risk for Infection

AKI suppresses immune function and is considered an immunosuppressed state. Clients carry a substantially higher risk of later infection and sepsis, and since sepsis is the leading cause of death in AKI, the inflammatory and counter-inflammatory responses may drive prolonged immunoparalysis.

Assess skin integrity. Scratching excoriations can become infected. Livedo reticularis, digital ischemia, butterfly rash, and purpura suggest vasculitis; track marks suggest endocarditis in an IV drug user. Pruritus from calcium phosphate deposition and nail atrophy is common in uremia.

Monitor vital signs. Fever above 100.4°F with rising pulse and respirations signals an inflammatory process, though sepsis can occur without fever. Clients with worse kidney prognosis present febrile on admission, and temperature dropping after 4 days of hospitalization makes it a useful early indicator.

Monitor WBC count with differential, and obtain cultures and sensitivities, administering antibiotics as indicated. See Laboratory and Diagnostic Procedures.

Promote good hand washing by client and staff. This cuts cross-contamination. Staff in direct contact spread nosocomial infections, so proper, regular hand washing per standard guidelines is essential.

Avoid invasive procedures and catheter manipulation when possible; use aseptic technique on IV and invasive lines, change dressings per protocol, and note edema or purulent drainage. This limits bacterial entry, and early detection prevents sepsis. Risk factors for post-AKI infection include at least 3 days of oliguria, higher daily fluid overload, invasive procedures, higher illness severity, and dialysis.

Provide routine catheter care and meticulous perineal care; keep the drainage system closed and remove the indwelling catheter as soon as possible. This reduces bacterial colonization and ascending UTIs. Catheters help diagnose obstruction and measure output but carry catheter-associated infection risk.

Encourage deep breathing, coughing, and frequent position changes. This prevents atelectasis and mobilizes secretions, reducing pulmonary infection risk.

Administer IV fluids as indicated. Septic AKI clients run lower output, receive more fluid and diuretics, and more often need restriction than non-septic clients. Crystalloids are the resuscitation fluid of choice; avoid hydroxyethyl starches and hyperchloremic solutions.

Administer antimicrobial therapy and vasopressors as prescribed. See Pharmacologic Management.

Avoid nephrotoxic medications. Avoiding nephrotoxic drugs and contrast agents is key to AKI prevention in septic clients, especially high-risk ones.

Provide adequate nutritional support. Septic AKI is a hypercatabolic state needing adapted protein and calories. Account for baseline characteristics, underlying conditions, volume status, and protein loss through RRT, and individualize each plan.

5. Minimizing Risk for Hypovolemia

During the diuretic phase, daily urine output runs roughly 1 to 3 liters and can reach 5 liters or more. The kidneys recover excretion but cannot concentrate urine, so massive volume loss can cause hypovolemia and hypotension. Watch for hyponatremia, hypokalemia, and dehydration. This phase may last 1 to 3 weeks.

Measure I&O accurately, weigh daily, and calculate insensible losses. Fluid intake should approximate losses through urine, nasogastric or wound drainage, and insensible water loss. Suspect insensible losses driving severe hypovolemia in clients with restricted fluid access and in comatose or sedated clients.

Monitor BP (including postural changes), HR, and mean arterial pressure (MAP). Orthostatic hypotension and tachycardia suggest hypovolemia. Hypotension below a threshold MAP is tied to stage 3 progression. Surviving Sepsis guidelines recommend keeping MAP at 65 mmHg or higher in sepsis, and some reports suggest a MAP of 70 mm Hg or higher prevents AKI and progression to severe stages.

Note dehydration signs: dry mucous membranes, thirst, dulled sensorium, peripheral vasoconstriction. In the diuretic or post-obstructive phase, output can exceed 3 liters/day. ECF depletion activates thirst, and sodium depletion causes persistent thirst unrelieved by water. Continued losses with inadequate replacement lead to hypovolemia, often with thirst, low output, dizziness, and orthostatic hypotension.

Measure and monitor urine output closely. In one study, AKI incidence rose from 24% to 52% when hourly urine output was added as a variable. Output directly reflects GFR, making it a sensitive, early AKI biomarker.

Monitor laboratory studies. In non-oliguric ARF or the diuretic phase, large urine losses cause sodium wasting, and elevated urinary sodium osmotically increases fluid loss. Sodium restriction may break the cycle. Declining renal function disrupts sodium and potassium homeostasis, so abnormal sodium often comes with hypokalemia or hyperkalemia.

Provide allowed fluids across the 24-hour period. The diuretic phase can revert to oliguria if intake lags or nocturnal dehydration occurs, and a longer oliguric phase means a poorer recovery prognosis. Reversing hypovolemia often treats AKI, but rapid infusion can cause life-threatening overload.

Control environmental temperature and limit bed linens as indicated. This reduces diaphoresis and overall fluid loss, since cooler temperatures constrict skin vessels and cut sweat production.

Administer IV fluids as indicated. Hypovolemia potentiates every form of AKI. Vigorous fluid administration aims to reverse renal ischemia and dilute nephrotoxins, heading off acute tubular necrosis or recurrent injury.

Administer vasopressors as prescribed. In vasomotor shock with or at risk for AKI, vasopressors go alongside fluids. For hypotension unresponsive to resuscitation, target a MAP of 65 or greater. Catecholamines, vasopressin, and angiotensin II are the available options for septic shock.

Insert a urinary catheter as indicated. Early placement allows diagnosis and treatment of urethral and bladder outlet obstruction and accurate output measurement, balanced against catheter-associated infection risk.

6. Initiating Health Teachings and Patient Education

Clients who survive an AKI episode carry higher risk of both kidney and non-kidney problems afterward. Post-discharge implications are under-recognized and worsened by fragmented, poorly coordinated care.

Review the disease process, prognosis, and precipitating factors. This gives the client a base for informed choices. Community AKI tied to hypovolemia and sepsis is under-recognized, while hospital-acquired AKI develops in the ICU amid multiple organ failure, post-cardiovascular procedures, sepsis, or nephrotoxic medications.

Identify symptoms that require medical attention: decreased output, sudden weight gain, edema, lethargy, bleeding, signs of infection, altered mentation. Prompt action can prevent complications or progression to chronic renal failure. Most AKI is managed by non-nephrologists who may miss early signs, which delays recognition.

Review the dietary plan and restrictions, including a written food-restriction sheet. Adequate nutrition promotes healing, and adherence prevents complications. Needs are driven by the primary disease and comorbidities, not AKI alone. Non-catabolic AKI from hypovolemia is common in older and malnourished clients, stemming from dehydration, upper GI bleeding, congestive heart disease, and hypoalbuminemia.

Review medications and have the client discuss all drugs and herbal supplements with the provider. Drugs concentrated in or excreted by the kidneys can accumulate to toxic levels or cause permanent damage, and some supplements interact with prescriptions. Drug-associated AKI runs through direct nephrotoxicity (tubuloepithelial injury, interstitial nephritis, glomerular injury, obstruction) or indirect nephrotoxicity from reduced renal blood flow.

Set a regular weighing schedule. Weight tracks fluid and dietary needs. Obesity raises AKI risk, and a BMI of 31 kg/m² or higher carries mortality as high as a BMI under 18 kg/m².

Explain renal function after the acute episode. Residual defects may or may not be permanent. Continued nephron loss drives hyperfiltration until complete failure, which explains why progressive failure often follows apparent recovery.

Have the client observe urine character, amount, and frequency. Changes reflect altered renal function and the need for dialysis. Granular, muddy brown casts strongly suggest acute tubular necrosis; reddish-brown or cola-colored urine suggests myoglobin or hemoglobin.

Provide social and emotional support to client and family. Support reassures them through procedures. Stronger social support improves a person's ability to acquire and understand medical information and navigate the healthcare system, helping establish healthy behaviors.

Review fluid restriction; remind the client to spread fluids over the day and count all fluids, including ice. Depending on cause and stage, the client may need to restrict or increase fluids. Treat fluids as drugs and use them judiciously, with individual targets and assessment of fluid responsiveness.

Discuss activity restriction and gradual return to activity; teach energy-saving, relaxation, and diversional techniques. Severe ARF may force activity restriction and prolonged weakness during recovery. Higher physical activity is associated with improved renal function, and those who recover have better outcomes than those with persistent impairment.

Discuss the reality of continued fatigue. Reduced metabolic energy, anemia, and discomfort produce fatigue. Survivors of severe AKI report worse health-related quality of life than the general population even after adjusting for kidney function, with both physical and mental components affected.

Discuss dialysis or transplantation if these are likely future options. The client may now be ready to weigh options previously raised by the provider. KDIGO recommends a kt/v of 3.9 per week with intermittent or extended RRT and an effluent volume of 20 to 25 mg/kg/hour with CRRT.

Determine ADLs and personal responsibilities; identify available resources and support systems. This helps the client manage lifestyle change. Social support improves self-management and slows disease progression.

Schedule activities with adequate rest periods. This prevents excessive fatigue and conserves energy for healing. Exercise can blunt many adverse outcomes of an AKI episode, and programs suited to cardiac clients appear feasible in the AKI population.

Stress the need for followup care and lab studies. Renal function can be slow to return (up to 12 months), and deficits may persist. Recovery is usually seen within the first 2 weeks, and many nephrologists diagnose end-stage failure 6 to 8 weeks after onset, but some clients regain function much later, so recheck periodically.

Be well-informed about AKI before teaching. Nursing is integral to the care team. In high-income countries, standards and credentialing are well established, while in low- to middle-income settings nursing care and education vary widely.

Arrange followup with a nephrologist. Nephrologists recognize and manage CKD complications by evidence-based guidelines better than primary care providers. Some centers run dedicated post-AKI clinics covering BP and urine albumin control, quarterly labs, cardiovascular risk modification, CKD management, medication reconciliation, and comorbidity referrals.

7. Administering Medications and Pharmacologic Support

Medications target the underlying cause, manage complications, and support renal recovery: diuretics to raise output, electrolyte supplements, blood pressure control, renal vasodilators and antioxidants to limit further damage, and drugs for contributing conditions such as antibiotics for sepsis.

Diuretics (furosemide, bumetanide, torsemide, mannitol). Given early in the oliguric phase to try to convert to a non-oliguric phase, flush tubular debris, reduce hyperkalemia, and promote output. Furosemide corrects volume overload when the kidneys still respond, often at high IV doses, but it does not convert oliguric AKI or raise output in a client who is not hypervolemic.

Vasodilators (fenoldopam). A selective dopamine-receptor agonist and rapid-acting vasodilator, 6 times more potent than dopamine at producing renal vasodilation. It raises cortical and medullary blood flow and diuresis with minimal adrenergic effect, and is indicated for severe hypertension, including in renal compromise.

Calcium channel blockers. Given early in nephrotoxic ATN to reduce calcium influx into kidney cells, maintaining cell integrity and improving GFR. Protective in animal models if given before insult; the main human benefit is preventing AKI in renal transplant clients on cyclosporine.

Inotropic agents (dopamine). Dopamine stimulates adrenergic and dopaminergic receptors with a dose-dependent effect. At low doses it favors dopaminergic receptors, producing renal vasodilation and enhancing renal perfusion.

Calcium gluconate. Serum calcium is often low but rarely needs specific treatment in ARF. Calcium gluconate treats hypocalcemia and offsets hyperkalemia by reducing cardiac irritability, and it directly antagonizes the neuromuscular and cardiovascular effects of magnesium.

Aluminum hydroxide gels. Rising phosphate from failed glomerular filtration calls for phosphate-binding antacids to limit GI phosphate absorption.

Glucose and insulin. A temporary measure to lower serum potassium by driving it into cells when cardiac rhythm is threatened. Give glucose with insulin to prevent hypoglycemia.

Sodium bicarbonate or sodium citrate. Used to correct acidosis or hyperkalemia by raising serum pH when the client is severely acidotic and not fluid-overloaded. Raising the bicarbonate load above the proximal tubule's reduced absorptive capacity produces a marked bicarbonate diuresis.

Sodium polystyrene sulfonate with or without sorbitol. This exchange resin trades sodium for potassium in the GI tract to lower serum potassium; sorbitol adds osmotic diarrhea to help excrete it. Slow onset makes it a second-line agent in emergencies.

Iron preparations. Iron deficiency can develop with protein restriction, anemia, or impaired GI function.

Calcium carbonate. Restores serum levels to support cardiac and neuromuscular function, clotting, and bone metabolism, and serves as a phosphate binder as GI phosphate absorption falls.

Selenium, vitamin C, and folic acid. Vital coenzymes for cell growth, reduced by protein restriction. In critical illness, vitamins and trace elements support immunomodulation, wound healing, and antioxidant defense; replace selenium and micronutrients lost in effluent. The optimal vitamin C dose is unknown, but 100 mg/dL has been suggested.

Antibiotics. Early appropriate antimicrobial therapy within 6 hours, ideally within 1 hour, is the cornerstone of sepsis treatment and improves survival. Longer delays in hypotensive septic shock are tied to early AKI.

Vasopressors. Often needed in septic shock, since fluids alone do not correct sepsis-induced vasodilation and endothelial dysfunction. Norepinephrine is the drug of choice for septic clients needing vasopressors.

8. Monitoring Laboratory and Diagnostic Procedures

Lab and diagnostic studies drive ARF evaluation and management: blood tests for kidney function (serum creatinine, BUN), electrolytes, and acid-base balance, plus urinalysis and urine electrolytes to gauge function and identify the cause.

BUN and creatinine. Both may rise, but creatinine is the better marker because it is not affected by hydration, diet, or tissue catabolism. Dialysis is usually indicated if the BUN-to-creatinine ratio exceeds 10:1 or if therapy fails to control fluid overload or metabolic acidosis. The ratio can exceed 20:1 when urea reabsorption is enhanced.

Urine sodium. In ATN, tubular integrity is lost and sodium resorption is impaired, raising sodium excretion. FENa indicates tubular function and is useful in AKI only with oliguria.

Serum sodium. Hyponatremia can come from dilutional overload or the kidney's inability to conserve sodium; hypernatremia indicates total body water deficit. AKI impairs sodium and potassium homeostasis, and abnormal sodium is a mortality risk factor independent of potassium in heart failure.

Serum potassium. Lack of excretion or selective retention to clear hydrogen ions causes hyperkalemia, a common and important AKI complication requiring prompt intervention.

Hemoglobin and hematocrit. Decreases may mean hemodilution from hypervolemia, though prolonged failure brings anemia from RBC loss; rule out active or occult hemorrhage. Postoperative anemia and falling hemoglobin predict AKI and in-hospital mortality in cardiac surgery, so detect and correct it.

Calcium. Calcium deficit worsens the toxic effects of potassium. Hypocalcemia is common in AKI; marked hypocalcemia is more typical of chronic renal failure.

Magnesium. Dialysis or calcium administration may be needed to counter the CNS-depressive effects of elevated magnesium. Declining renal function raises accumulation risk with supplementation. In AKI, hypermagnesemia usually appears in the oliguric phase and normalizes during the polyuric phase.

Serial chest x-rays. Increased cardiac size, prominent pulmonary vascular markings, pleural effusion, and congestion reflect fluid overload or chronic renal and heart failure. Obtain routine films to check for volume overload.

Echocardiography. An essential tool for guiding resuscitation in critically ill clients and assessing fluid overload, since reversing organ dysfunction often requires IV fluids.

Stool guaiac test. GI bleeding is a known complication of renal failure with uncertain pathogenesis, attributed variously to uremic effects on the GI mucosa, impaired platelet adhesiveness, and the heparinization and antiplatelet agents used in dialysis clients.

WBC count with differential. Elevated WBCs may indicate generalized infection, but leukocytosis is common in ARF and can reflect injury within the kidney. A left shift indicates infection, and WBC changes track long-term kidney outcomes.

Culture and sensitivity. Verifies infection and identifies organisms to guide treatment. Note that many anti-infectives need dose or interval adjustment with impaired renal clearance. Eosinophils on Wright or Hansel stain may suggest interstitial nephritis, but with poor sensitivity, and can also appear in UTIs, glomerulonephritis, and atheroembolic disease.