Quiz: Pathophysiology acute kidney injury
This quiz focuses on the pathophysiology of acute kidney injury, exploring its causes, mechanisms, classifications, and clinical implications.
Quiz(52 questions)
1. What is the primary cause of prerenal acute kidney injury?
Terms in this Study Set(52)
Causes of Acute Kidney Injury(16)
What is prerenal acute kidney injury?
This form of AKI occurs due to decreased blood flow to the kidneys. Causes include: - Hypovolemia - Heart failure - Systemic vasodilation
True or False: Intrinsic AKI is caused by external factors.
False. Intrinsic AKI results from direct damage to the kidney tissue, often due to: - Ischemia - Nephrotoxins
Fill in the blank: Postrenal AKI occurs due to ____.
obstruction of urinary outflow.
Name a common cause of prerenal AKI.
Hypovolemia, which can stem from dehydration, blood loss, or excessive diuretics.
Comparison: Prerenal vs Intrinsic AKI.
Prerenal: caused by decreased perfusion. Intrinsic: caused by kidney damage.
What are nephrotoxins?
Substances that can damage kidney cells, such as: - Certain antibiotics - NSAIDs - Radiocontrast agents
How can severe heart failure lead to AKI?
It reduces cardiac output, leading to decreased renal perfusion and potential prerenal AKI.
True or False: Postrenal AKI is reversible in all cases.
False. If prolonged, it can lead to irreversible kidney damage.
List two intrinsic causes of AKI.
- Acute tubular necrosis (ATN) - Glomerulonephritis
What is acute tubular necrosis (ATN)?
A common cause of intrinsic AKI, ATN occurs due to damage to the kidney tubules, often from ischemia or nephrotoxins.
Fill in the blank: Ureteral obstruction can lead to ____ AKI.
postrenal
Name a potential consequence of untreated postrenal AKI.
Hydronephrosis, which can lead to permanent kidney damage if left untreated.
What role do NSAIDs play in AKI?
They can cause renal ischemia by inhibiting prostaglandins that regulate renal blood flow.
True or False: Acute glomerulonephritis is a prerenal cause.
False. It is classified as an intrinsic cause, involving inflammation of the glomeruli.
Identify one postrenal cause of AKI.
Urethral obstruction due to kidney stones or tumors.
What can hypovolemia lead to in terms of kidney function?
Decreased glomerular filtration rate (GFR) due to reduced perfusion.
Mechanisms of Injury(12)
What is acute tubular injury?
Damage to the renal tubules often due to ischemia or nephrotoxins, leading to impaired kidney function.
True or False: Inflammatory mediators contribute to kidney injury.
True - They cause vasodilation, increased permeability, and attract immune cells, exacerbating damage.
Name two key cellular mechanisms of injury.
- Oxidative stress - Apoptosis
Fill in the blank: Ischemic injury primarily affects __________ cells.
proximal tubular cells.
What role do reactive oxygen species (ROS) play in AKI?
ROS induce cellular damage, promote apoptosis, and contribute to inflammation.
Compare ischemic and nephrotoxic injury.
Ischemic: reduced blood flow, Nephrotoxic: exposure to toxins.
What occurs during tubular obstruction?
Increased intratubular pressure, reduced glomerular filtration rate (GFR), and potential backflow damage.
Cause → Effect: Prolonged hypoxia leads to __________.
cell injury and death.
What is the effect of reduced renal blood flow on the nephron?
Decreased glomerular filtration rate (GFR) and impaired solute/water reabsorption.
Name two nephrotoxins involved in acute kidney injury.
- Aminoglycosides - Contrast agents
What does apoptosis in kidney cells lead to?
Loss of functional nephron mass and impaired kidney function.
True or False: Tubular epithelial cells can regenerate after injury.
True - They have a capacity for regeneration, but prolonged injury can lead to irreversible damage.
Clinical Presentation and Diagnosis(12)
What are common signs of acute kidney injury?
- Oliguria or anuria - Edema - Nausea - Confusion
True or False: Oliguria is defined as urine output less than 400 mL per day.
True: Oliguria indicates reduced urine output, a key sign of kidney dysfunction.
List three common symptoms of acute kidney injury.
- Fatigue - Swelling in legs - Shortness of breath
What diagnostic tests are used for acute kidney injury?
- Serum creatinine test - Urinalysis - Kidney ultrasound
Fill in the blank: An increase in serum creatinine of ____ is a criterion for diagnosing AKI.
0.3 mg/dL or more.
How does acute kidney injury differ from chronic kidney disease?
AKI is sudden, often reversible; CKD is gradual, progressive damage.
What is the significance of a urine output of less than 0.5 mL/kg/hr?
Indicates severe oliguria, a critical sign of acute kidney injury.
What might you find in urinalysis of AKI patients?
- Hematuria - Proteinuria - Casts (muddy brown casts)
What is a common symptom in acute kidney injury?
Nausea and vomiting - Patients may experience gastrointestinal symptoms due to uremia.
True or False: Anuria is a sign of acute kidney injury.
True - Anuria, defined as urine output less than 50 mL per day, indicates severe kidney impairment.
Fill in the blank: A rise in serum creatinine by ____ within 48 hours indicates AKI.
0.3 mg/dL - This increase is a key diagnostic criterion for acute kidney injury.
Compare oliguria and anuria in AKI.
Oliguria: <400 mL/day Anuria: <50 mL/day - Both indicate reduced kidney function, but anuria is more severe.
Management and Prognosis(12)
What are the main treatment goals for acute kidney injury?
Restore kidney function, prevent complications, manage fluid and electrolyte balance.
True or False: Dialysis is always required for acute kidney injury.
False - Dialysis is needed only when severe complications arise.
Fill in the blank: The use of __ is critical in managing fluid overload.
diuretics - They help increase urine output and reduce fluid retention.
What is the role of supportive care in acute kidney injury?
Monitor vital signs, maintain hydration, and manage electrolyte imbalances.
Comparison: Prerenal vs. intrinsic causes of acute kidney injury
Prerenal: due to decreased blood flow. Intrinsic: damage to kidney tissue.
Which medications should be avoided in acute kidney injury?
NSAIDs, certain antibiotics, and contrast agents - they can worsen kidney function.
What laboratory values indicate improvement in kidney function?
Decreasing serum creatinine, stable electrolyte levels, and increased urine output.
True or False: Prognosis is always poor in patients with acute kidney injury.
False - Many patients recover fully with appropriate management.
How does early intervention affect outcomes in acute kidney injury?
Early intervention significantly improves recovery rates and reduces complications.
What is the benefit of nutritional support in acute kidney injury?
Prevents malnutrition, supports recovery, and maintains muscle mass during illness.
Cause → Effect: Volume depletion leads to ____
prerenal acute kidney injury - Decreased blood flow reduces kidney perfusion.
What is the expected prognosis for mild acute kidney injury?
Good - Most patients recover completely without long-term consequences.
Questions in this Study Set(52)
1. What is the primary cause of prerenal acute kidney injury?
2. What is a primary goal in the management of acute kidney injury?
3. Which of the following best defines acute tubular injury?
4. Which of the following is a common sign of acute kidney injury?
5. Which of the following is NOT a common cause of intrinsic acute kidney injury?
6. Which factor is typically NOT associated with prerenal acute kidney injury?
7. True or False: Inflammatory cell recruitment is a significant factor in the progression of acute kidney injury.
8. True or False: An increase in serum creatinine is always indicative of chronic kidney disease.
9. Fill in the blank: Postrenal AKI is primarily caused by ____.
10. In a patient with acute kidney injury, which sign indicates a need for dialysis?
11. Which cellular mechanism is primarily responsible for cell death in ischemic injury?
12. Which symptom is least likely associated with acute kidney injury?
13. What can cause acute tubular necrosis?
14. What is the role of diuretics in acute kidney injury management?
15. Fill in the blank: Nephrotoxins can induce injury by causing __________ in tubular cells.
16. Fill in the blank: A urine output of less than ____ mL/kg/hr indicates severe oliguria.
17. How does severe dehydration relate to prerenal acute kidney injury?
18. Which laboratory value signifies a worsening of kidney function?
19. What is the effect of increased intratubular pressure during tubular obstruction?
20. What does a urinalysis in AKI patients typically reveal?
21. True or False: Nephrotoxins refer only to substances that are naturally occurring.
22. True or False: Early recognition and treatment of acute kidney injury improve prognosis.
23. Which of the following is NOT a common nephrotoxin associated with acute kidney injury?
24. Which condition is characterized by sudden kidney dysfunction?
25. What typically happens in postrenal acute kidney injury if the obstruction is not relieved?
26. Which of the following is NOT a risk factor for poor prognosis in acute kidney injury?
27. True or False: Oxidative stress is a minor player in the mechanisms of acute kidney injury.
28. What is the significance of a serum creatinine increase of 0.3 mg/dL within 48 hours?
29. Which of the following factors can contribute to prerenal acute kidney injury?
30. What is a common nutritional strategy for patients with acute kidney injury?
31. Which of the following best describes the relationship between prolonged hypoxia and renal cell injury?
32. Which of the following definitions applies to anuria?
33. What effect do NSAIDs have on kidney function?
34. Which medication should be avoided in patients with acute kidney injury?
35. What is the consequence of reduced renal blood flow on nephron function?
36. Which of the following is NOT a typical symptom of acute kidney injury?
37. True or False: Glomerulonephritis is a prerenal cause of acute kidney injury.
38. What is the expected prognosis for patients with severe acute kidney injury?
39. What happens to tubular epithelial cells after injury in terms of regeneration?
40. Compare oliguria and anuria in terms of urine output.
41. Which of the following scenarios could lead to postrenal acute kidney injury?
42. How does fluid management affect outcomes in acute kidney injury?
43. Which of the following scenarios describes nephrotoxic injury?
44. Which diagnostic test is primarily used to assess kidney function?
45. What is a common consequence of untreated prerenal acute kidney injury?
46. What can be a long-term consequence of untreated acute kidney injury?
47. Which cellular change is a hallmark of apoptosis in kidney cells?
48. What might cause confusion in a patient with acute kidney injury?
49. Which of the following is an intrinsic cause of acute kidney injury?
50. What can severe heart failure lead to in terms of kidney function?
51. Fill in the blank: Renal ischemia can lead to ____ AKI.
52. What is the role of hydration in preventing acute kidney injury?
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