Q: I have heard a great deal in the EB Community about kidney problems that affect those with EB. Can you tell me more? Is there a way to screen for them?
A: Diseases in the urinary tract system, which includes the kidneys, ureters, bladder and urethra are not common, but can be serious, even life-threatening, when they do occur. There is a need in the EB community for practical guidelines for monitoring and management of urinary tract system issues.
Glomerulonephritis (both acute and chronic), renal amyloidosis, IgA nephropathy and obstructive uropathy have been reported in both Junctional and Recessive Dystrophic EB. Each can lead to chronic renal failure (CRF). There are no hard numbers on how many in the EB community develop CRF.
Jemima Mellerio, BSc, MD, FRCP discussed protocols for the screening and management of urinary tract system issues at the IV International Symposium on Epidermolysis Bullosa in Santiago, Chile in September of 2007. The following reflects these recommendations:
Recommended Screening for Urinary System Disease:
For RDEB and JEB patients, a screening is recommended twice a year:
- Urea and electrolytes
- Urinalysis
- Blood pressure check
If the above are not normal, consider:
- Urine microscopy
- Urine culture
- Renal ultrasound
- DMSA scan
- Functional tests like a MAG 3 (diagnostic imaging)
For JEB patients, a screening is recommended annually:
If the above is not normal, consider:
If the above shows scarring or discrepancy, consider:
- Functional tests like a MAG 3
If obstruction is suspected, a renal ultrasound is recommended
If vesico-ureteric reflux is suspected, consider a MAG 3 or a micturating cystourethrogram (MCU)
General Principles of Management:
- Avoid instrumentation and surgery if possible
- Urethral catheters are tolerated short term
- Supra-pubic catheters are well-tolerated longer term
- Avoid constipation and dehydration
- Encourage toilet training at a normal age