Oliguria

Editor-In-Chief: Prab R Tumpati, MD
Obesity, Sleep & Internal medicine
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Oliguria
Synonyms	Hypouresis, hypouresia
Pronounce	N/A
Specialty	N/A
Symptoms	Decreased urine output, dark urine, fatigue, swelling
Complications	Acute kidney injury, electrolyte imbalance, fluid overload
Onset	Sudden or gradual
Duration	Varies depending on cause
Types	N/A
Causes	Dehydration, acute kidney injury, urinary tract obstruction, heart failure
Risks	Sepsis, shock, medications
Diagnosis	Urinalysis, blood tests, ultrasound
Differential diagnosis	Anuria, polyuria, nocturia
Prevention	N/A
Treatment	Address underlying cause, fluid management, medications
Medication	Diuretics, intravenous fluids
Prognosis	N/A
Frequency	Common in hospitalized patients
Deaths	Depends on underlying cause and treatment

Oliguria refers to abnormally low urine output, a significant clinical symptom often indicative of underlying medical conditions. It is a crucial indicator in renal and overall health assessment.

Definition

Oliguria is medically defined as urine output less than 500 milliliters (about 17 ounces) in adults over 24 hours. It differs from Anuria, where the urine output is less than 50 milliliters in the same period.

Causes

The causes of oliguria can be multifactorial, including but not limited to:

• Dehydration, resulting from inadequate fluid intake or excessive loss
• Acute or chronic kidney diseases like acute kidney injury (AKI) or chronic kidney disease (CKD)
• Blockages in the urinary system, such as kidney stones or tumors
• Cardiac conditions that lead to reduced blood flow to the kidneys
• Use of certain medications affecting kidney function

Symptoms and Diagnosis

Oliguria is often accompanied by other symptoms such as changes in urine color, increased thirst, and swelling in the body. Diagnosis typically involves blood tests, urine analysis, imaging studies, and assessing the patient's fluid balance and medical history.

Treatment

The treatment approach depends on the underlying cause. It may include fluid management, addressing the specific causes (like relieving urinary blockages), adjusting medications, or, in severe cases, renal replacement therapy.

An ultrasound image of a kidney, used in diagnosing causes of oliguria. Image from Wiki Commons.

Prevention and Management

Preventive strategies focus on maintaining proper hydration, monitoring kidney function, especially in high-risk individuals, and managing chronic diseases effectively.

See Also

• Renal Function
• Urine Analysis
• Fluid and Electrolyte Balance

External Links

• National Kidney Foundation - Understanding Oliguria
• UpToDate - Oliguria in Adults

References

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• Smith, J. D., & Lee, R. A. (2021). Oliguria: Causes, Diagnosis, and Treatment. Journal of Renal Medicine, 34(2), 112-120.
• Patel, M. K., & Thompson, C. D. (2022). Clinical Approach to Oliguria in Hospitalized Patients. American Journal of Medicine, 141(1), 58-67.

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