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What illness might be signaled by a sudden decrease in urine output?

Feb 27, 2023 Source: Cainiu Health
Dr. Zhao Xinju
Introduction
A sudden decrease in urine output may be related to heatstroke, urinary tract stones, or acute kidney failure. In cases of heatstroke or insufficient fluid intake, reduced kidney filtration leads to decreased urine production. Urinary tract stones can cause obstruction in the urinary passage, preventing urine from being excreted. Acute kidney failure results in a decreased glomerular filtration rate, thereby reducing urine output. Additionally, decreased urine output commonly occurs during the acute phase of shock.

　　A sudden decrease in urine output may be related to heatstroke, urinary tract stones, or acute kidney failure.

　　1. Heatstroke

　　During hot summer months, excessive fluid loss due to sweating, heatstroke, or insufficient water intake can reduce kidney filtration, leading to decreased urine output. In such cases, total urine volume over 24 hours is generally no less than 400 ml. It is advisable to drink more fluids to replenish body fluids and monitor whether urine output increases. However, if urine volume does not increase despite increased fluid intake, prompt medical evaluation is necessary.

　　2. Urinary Tract Stones

　　Urinary stones can cause obstruction of the urinary tract, preventing urine produced by the kidneys from being excreted, resulting in urine retention in the body and a sharp reduction in urine output. A urinary system ultrasound is recommended for further evaluation. Small stones may be passed by increasing fluid intake, while surgical intervention may be required in more severe cases.

　　3. Acute Kidney Failure

　　This commonly occurs due to pre-renal or intrinsic renal factors that lead to inadequate kidney perfusion and a sudden drop in glomerular filtration rate, or complications such as glomerulonephritis or acute nephritis that reduce the glomerular filtration rate, thereby decreasing urine output. Treatment may include diuretics such as furosemide tablets, hydrochlorothiazide tablets, or bendroflumethiazide tablets, as prescribed by a physician. Patients with acute kidney failure should seek immediate medical attention and receive targeted treatment under strict medical supervision.

　　In addition, the acute phase of shock can also lead to reduced blood volume and decreased urine output.

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