|Classification and external resources|
|ICD-9-CM||580.89, 581.89, 582.89, 583.89|
Interstitial nephritis (or tubulo-interstitial nephritis) is a form of nephritis affecting the interstitium of the kidneys surrounding the tubules, i.e., is inflammation of the spaces between renal tubules. This disease can be either acute, meaning it occurs suddenly, or chronic, meaning it is ongoing and eventually ends in kidney failure.
This disease is also caused by other diseases and toxins that damage the kidney. Both acute and chronic tubulointerstitial nephritis can be caused by a bacterial infection in the kidneys known as pyelonephritis, but the most common cause is by an adverse reaction to a drug. The drugs that are known to cause this sort of reaction are antibiotics such as penicillin and cephalexin, and nonsteroidal anti-inflammatory drugs (aspirin less frequently than others), as well as proton-pump inhibitors, rifampicin, sulfa drugs, fluoroquinolones, diuretics, allopurinol, and phenytoin. The time between exposure to the drug and the development of acute tubulointerstitial nephritis can be anywhere from 5 days to 5 months (fenoprofen induced).
At times, there are no symptoms of this disease, but when they do occur they are widely varied and can occur rapidly or gradually. When caused by an allergic reaction, the symptoms of acute tubulointerstitial nephritis are fever (27% of patients), rash (15% of patients), and enlarged kidneys. Some people experience dysuria, and lower back pain. In chronic tubulointerstitial nephritis the patient can experience symptoms such as nausea, vomiting, fatigue, and weight loss. Other conditions that may develop include hyperkalemia, metabolic acidosis, and kidney failure.
About 23% of patients have eosinophilia.
Urinary findings include:
- Eosinophiluria: Original studies with Methicillin-induced AIN showed sensitivity of 67% and specificity of 83%. The sensitivity is higher in patients with interstitial nephritis induced by methicillin or when the Hansel's stain is used. However, recent studies have called into question the accuracy of this test. A recent study showed that the sensitivity and specificity of urine eosinophil testing are 35.6% and 68% respectively.
- Blood in the urine and occasional RBC casts
- Sterile pyuria: white blood cells and no bacteria
- Nephrotic-range amount of protein in the urine may be seen with NSAID-associated AIN
Treatment consists of addressing the cause, such as by removing an offending drug. There is no clear evidence that corticosteroids help. Nutrition therapy consists of adequate fluid intake, which can require several liters of extra fluid.
The kidneys are the only body system that are directly affected by tubulointerstitial nephritis. Kidney function is usually reduced; the kidneys can be just slightly dysfunctional, or fail completely.
In chronic tubulointerstitial nephritis, the most serious long-term effect is kidney failure. When the proximal tubule is injured, sodium, potassium, bicarbonate, uric acid, and phosphate reabsorption may be reduced or changed, resulting in low bicarbonate, known as metabolic acidosis, low potassium, low uric acid known as hypouricemia, and low phosphate known as hypophosphatemia. Damage to the distal tubule may cause loss of urine-concentrating ability and polyuria.
In most cases of acute tubulointerstitial nephritis, the function of the kidneys will return after the harmful drug is not taken anymore, or when the underlying disease is cured by treatment. If the illness is caused by an allergic reaction, a corticosteroid may speed the recovery kidney function; however, this is often not the case.
Chronic tubulointerstitial nephritis has no cure. Some patients may require dialysis. Eventually, a kidney transplant may be needed.
- Baker R, Pusey C (2004). "The changing profile of acute tubulointerstitial nephritis". Nephrol Dial Transplant. 19 (1): 8–11. doi:10.1093/ndt/gfg464. PMID 14671029.
- Clarkson M, Giblin L, O'Connell F, O'Kelly P, Walshe J, Conlon P, O'Meara Y, Dormon A, Campbell E, Donohoe J (2004). "Acute interstitial nephritis: clinical features and response to corticosteroid therapy". Nephrol Dial Transplant. 19 (11): 2778–83. doi:10.1093/ndt/gfh485. PMID 15340098.
- Rossert J (2001). "Drug-induced acute interstitial nephritis". Kidney Int. 60 (2): 804–17. doi:10.1046/j.1523-1755.2001.060002804.x. PMID 11473672.
- Pusey C, Saltissi D, Bloodworth L, Rainford D, Christie J (1983). "Drug associated acute interstitial nephritis: clinical and pathological features and the response to high dose steroid therapy". Q J Med. 52 (206): 194–211. PMID 6604293.
- Handa S (1986). "Drug-induced acute interstitial nephritis: report of 10 cases". CMAJ. 135 (11): 1278–81. PMC 1491384. PMID 3779558.
- Buysen J, Houthoff H, Krediet R, Arisz L (1990). "Acute interstitial nephritis: a clinical and morphological study in 27 patients". Nephrol Dial Transplant. 5 (2): 94–9. doi:10.1093/ndt/5.2.94. PMID 2113219.
- Schwarz A, Krause P, Kunzendorf U, Keller F, Distler A (2000). "The outcome of acute interstitial nephritis risk factors for the transition from acute to chronic interstitial nephritis". Clin Nephrol. 54 (3): 179–90. PMID 11020015.
- Muriithi, A.K., S.H. Nasr, and N. Leung, Utility of urine eosinophils in the diagnosis of acute interstitial nephritis. Clinical Journal of The American Society of Nephrology: CJASN, 2013. 8(11): p. 1857-62.
- Perazella, M.A. and A.S. Bomback, Urinary eosinophils in AIN: farewell to an old biomarker? Clinical Journal of The American Society of Nephrology: CJASN, 2013. 8(11): p. 1841-3.
- Lins R, Verpooten G, De Clerck D, De Broe M (1986). "Urinary indices in acute interstitial nephritis". Clin Nephrol. 26 (3): 131–3. PMID 3769228.
- Fogazzi, G.B., et al., Urinary sediment findings in acute interstitial nephritis. American Journal of Kidney Diseases, 2012. 60(2): p. 330-332
- Graham G, Lundy M, Moreno A (1983). "Failure of Gallium-67 scintigraphy to identify reliably noninfectious interstitial nephritis: concise communication". J Nucl Med. 24 (7): 568–70. PMID 6864309.
- Linton A, Richmond J, Clark W, Lindsay R, Driedger A, Lamki L (1985). "Gallium67 scintigraphy in the diagnosis of acute renal disease". Clin Nephrol. 24 (2): 84–7. PMID 3862487.
- Mahan KL, Escott-Stump S (2003). "39". In Alexopolos Y. Krause's Food, Nutrition, & Diet Therapy (11th ed.). Philadelphia Pennsylvania: Saunders. p. 968. ISBN 0-7216-9784-4.