What is the pathogenesis of renal pruritus?

Updated: Mar 03, 2020
  • Author: David F Butler, MD; Chief Editor: William D James, MD  more...
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Answer

Parathyroid hormone (PTH) levels are commonly elevated in persons with chronic renal failure (CRF). [1] Dramatic relief of renal pruritus after subtotal parathyroidectomy has been described, and findings from 1 study confirmed previous case reports. However, other studies have shown no correlation between circulating PTH levels and the intensity of pruritus. Of note, a patient with a PTH-producing bronchogenic carcinoma was reported to have intractable pruritus as the presenting symptom. [7, 8, 9]

Elevated levels of divalent ions, such as calcium, magnesium, and phosphate, are thought to play a role. Marked improvement of pruritus resulting from low dialysate calcium and magnesium concentrations has been reported. [10, 11] Increased amounts of these ions are also seen in the skin of pruritic patients.

Decreased transepidermal elimination of pruritogenic substances, xerosis, elevated levels of serum bile acids, and increased epidermal vitamin A levels all may contribute to the condition. Elevated serum levels of serotonin are seen in patients with CRF. Serotonin is important in the transmission of pain and may be a contributing factor.


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