What is the leading cause of intrinsic renal failure?

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Intrinsic renal failure occurs when the kidney tissue itself is damaged, most commonly the tubular epithelium. The leading cause of this type of injury is exposure to nephrotoxic agents, which directly injure tubular cells and can trigger acute tubular necrosis. Nephrotoxins include aminoglycoside antibiotics (like gentamicin), Amphotericin B, radiographic contrast media, cisplatin, and NSAIDs. This injury leads to loss of tubular reabsorption, tubular obstruction from sloughed cells, and a fall in glomerular filtration, resulting in rising creatinine and reduced urine output.

While conditions like diabetes mellitus and hypertension drive chronic kidney disease over time, and glomerulonephritis can cause intrinsic renal injury, nephrotoxic exposure is the most common cause of intrinsic (acute) renal failure in many clinical settings.