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side by side comparison

AKI vs CKD: Acute Reversible vs Chronic Progressive Kidney Failure

A creatinine of 4.0 means very different things depending on whether it was 0.9 yesterday or has been climbing for years. AKI and CKD demand opposite priorities — one is a rescue mission to restore function, the other is a long-game strategy to preserve what's left. Picking the wrong approach on the NCLEX costs you the question.

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Comparison

Side-by-side2 compared
Focus
Dimension
Acute Kidney Injury
Chronic Kidney Disease
Onset, cause & reversibility
  • ★Hours–days
  • Often reversible if treated early
  • Prerenal, intrarenal (ATN), postrenal causes
  • ★Months–years
  • Irreversible nephron loss
  • Diabetes (#1), HTN (#2), GN, PKD
Urine output & presentation
  • ★Oliguric phase: UO <400 mL/day
  • Diuretic phase (3–5 L/day), then recovery
  • UO preserved until late stages
  • Chronic fatigue, pruritus (uremia)
BUN/Cr, GFR & electrolytes
  • Rapid BUN/Cr rise
  • BUN:Cr >20:1 = prerenal cause
  • Sudden ↑K⁺ and acute acidosis
  • KDIGO staging by Cr rise and UO
  • ★Staged by GFR: Stage 5 <15 = ESKD
  • Chronic ↑K⁺, ↑phos, ↓Ca
Nursing priorities
  • Strict I&O, daily weights
  • Avoid nephrotoxins (NSAIDs, contrast)
  • Monitor K⁺ + telemetry if oliguric
  • Lifelong renal diet: low Na⁺/K⁺/phos
  • AV fistula care: thrill + bruit
  • Avoid nephrotoxins (NSAIDs, contrast)
  • Strict I&O, daily weights
Treatment goal
  • Find and fix the cause
  • Restore perfusion (prerenal)
  • Relieve obstruction (postrenal)
  • Slow progression: ACEi/ARB, BP <130/80
  • EPO for anemia
  • Phosphate binders
Patient teaching
  • Recheck kidney function in 3 mo
  • Stay hydrated once recovering
  • Limit high-phos foods (dairy, colas)
  • Protect fistula arm: no BP, IV, or labs
  • Take phosphate binders with meals
Dialysis triggers — escalate
  • Emergent: refractory ↑K⁺
  • Emergent: fluid overload, acidosis
  • Emergent: uremic pericarditis or AMS
  • Planned dialysis: GFR <15
  • Planned for symptomatic ESKD
  • AV fistula placed months ahead
Complications
  • Rapid uremia if untreated
  • Acute ↑K⁺ → fatal arrhythmia
  • Progression to CKD
  • Renal osteodystrophy (2° hyperPTH)
  • Anemia (↓ erythropoietin)
  • Uremic pericarditis
Onset, cause & reversibility

Acute Kidney Injury

  • ★Hours–days
  • Often reversible if treated early
  • Prerenal, intrarenal (ATN), postrenal causes

Chronic Kidney Disease

  • ★Months–years
  • Irreversible nephron loss
  • Diabetes (#1), HTN (#2), GN, PKD
Urine output & presentation

Acute Kidney Injury

  • ★Oliguric phase: UO <400 mL/day
  • Diuretic phase (3–5 L/day), then recovery

Chronic Kidney Disease

  • UO preserved until late stages
  • Chronic fatigue, pruritus (uremia)
BUN/Cr, GFR & electrolytes

Acute Kidney Injury

  • Rapid BUN/Cr rise
  • BUN:Cr >20:1 = prerenal cause
  • Sudden ↑K⁺ and acute acidosis
  • KDIGO staging by Cr rise and UO

Chronic Kidney Disease

  • ★Staged by GFR: Stage 5 <15 = ESKD
  • Chronic ↑K⁺, ↑phos, ↓Ca
Nursing priorities

Acute Kidney Injury

  • Strict I&O, daily weights
  • Avoid nephrotoxins (NSAIDs, contrast)
  • Monitor K⁺ + telemetry if oliguric

Chronic Kidney Disease

  • Lifelong renal diet: low Na⁺/K⁺/phos
  • AV fistula care: thrill + bruit
  • Avoid nephrotoxins (NSAIDs, contrast)
  • Strict I&O, daily weights
Treatment goal

Acute Kidney Injury

  • Find and fix the cause
  • Restore perfusion (prerenal)
  • Relieve obstruction (postrenal)

Chronic Kidney Disease

  • Slow progression: ACEi/ARB, BP <130/80
  • EPO for anemia
  • Phosphate binders
Patient teaching

Acute Kidney Injury

  • Recheck kidney function in 3 mo
  • Stay hydrated once recovering

Chronic Kidney Disease

  • Limit high-phos foods (dairy, colas)
  • Protect fistula arm: no BP, IV, or labs
  • Take phosphate binders with meals
Dialysis triggers — escalate

Acute Kidney Injury

  • Emergent: refractory ↑K⁺
  • Emergent: fluid overload, acidosis
  • Emergent: uremic pericarditis or AMS

Chronic Kidney Disease

  • Planned dialysis: GFR <15
  • Planned for symptomatic ESKD
  • AV fistula placed months ahead
Complications

Acute Kidney Injury

  • Rapid uremia if untreated
  • Acute ↑K⁺ → fatal arrhythmia
  • Progression to CKD

Chronic Kidney Disease

  • Renal osteodystrophy (2° hyperPTH)
  • Anemia (↓ erythropoietin)
  • Uremic pericarditis

★ marks the fact that sets a column apart.

Clinical Pearl

AKI = sudden creatinine spike, find the cause and fix it; CKD = slow GFR slide, slow the decline.

Component Topics

Acute Kidney Injury — AKICKD Stages & Management

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