Nephropathy in illicit drug abusers: a postmortem analysis.

BACKGROUND Illicit drug abuse is an independent risk factor for chronic kidney disease, but the pathogenic consequences of long-term exposure to illicit drugs and contaminants under unsterile conditions remains unclear. STUDY DESIGN Case series. SETTING & PARTICIPANTS All deceased persons (n 5 129) who underwent forensic autopsy because of suspected connection with illicit drug abuse between January 1, 2009, and April 30, 2011, in Frankfurt/Main, Germany. PREDICTOR Clinical characteristics and patterns of drug abuse. OUTCOMES Histopathologic alterations of the kidney. MEASUREMENTS Hematoxylin and eosin, periodic acid-Schiff, Sirius, and Congo Red stainings and immunoglobulin A immunohistochemistry of all cases; additional histochemical stainings or immunohistochemistry and electron microscopy in selected cases. RESULTS Individuals were mostly white (99.2%), were male (82.2%), and had intravenous drug use (IVDU) (81.4%). Median age at death was 39 years and duration of drug abuse was 17 years. The majority (79.1%) took various drugs in parallel as assessed by toxicologic analysis. Despite a young age, the deceased had a high burden of comorbid conditions, especially cardiovascular disease, liver cirrhosis, and infections. Evaluation of the kidneys demonstrated a broad spectrum of pathologic alterations predominated by arteriosclerotic and ischemic damage, mild interstitial inflammation, calcification of renal parenchyma, and interstitial fibrosis and tubular atrophy, with hypertensive-ischemic nephropathy as the most common cause of nephropathy. Interstitial inflammation (OR, 16.59; 95% CI, 3.91-70.39) and renal calcification (OR, 2.43; 95% CI, 1.03- 5.75) were associated with severe IVDU, whereas hypertensive and ischemic damage were associated with cocaine abuse (OR, 6.00; 95% CI, 1.27-28.44). Neither specific glomerular damage indicative for heroin and hepatitis C virus-related disease nor signs of analgesic nephropathy were found. LIMITATIONS White population, lack of a comparable control group, incomplete clinical data, and absence of routine immunohistochemistry and electron microscopy. CONCLUSIONS Illicit drug abuse is associated with a broad but unspecific spectrum of pathologic alterations of the kidneys. Cocaine abuse has a deleterious role in this setting by promoting hypertensive and ischemic damage.