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Individuals with very low birth weight 'at increased chronic kidney disease risk'

Washington, Thu, 20 Nov 2008 ANI

Washington, Nov 20 (ANI): Babies with very low birth weights are at an increased risk of developing chronic renal disease, called segmental glomerulosclerosis, in future, according to a new study.


Usually, kidney specialists taking care of adult patients often overlook birth history. However, patients with focal segmental glomerulosclerosis develop scarring of glomeruli, the filtering units of the kidney. This development can cause a decline in kidney function and leakage of protein into the urine.


Low birth weight (less than 5.5 pounds) caused by prematurity or slow growth prior to birth is a risk factor for adult hypertension, coronary heart disease, stroke, diabetes, and other diseases.


In the study, researchers aimed at finding the link between lower birth weight and the risk of developing a condition called secondary focal segmental glomerulosclerosis.


Thus, Vivette D'Agati, MD, of the Columbia University College of Physicians and Surgeons in New York City, NY, and her colleagues studied six patients (two women and four men) who had clinical indications of this condition and who were born prematurely and of a very low birth weight.


The average age of patients was 32 years, and their average birth weight was 3.3 pounds. They all were born between 22 and 30 weeks of gestation, compared with full-term babies who are born between 37 and 42 weeks.


For their study, the researchers performed urine tests that measured whether protein was leaking into the urine and blood tests that indicated how well the patients' kidneys were functioning. They also biopsied the patients' kidneys to analyze the tissue.


After all the measurements and tests, it was found that the patients had developed focal segmental glomerulosclerosis.


The authors noted that because new nephrons-the filtering structures of the kidney-are not formed after birth, an individual's supply of nephrons is dependent on the environment in the uterus prior to birth and the extent of a foetus' growth and development.


In case an individual is born with a deficiency of nephrons, their kidneys may become strained, which can lead to declines in kidney function over time.


This may be the scenario for individuals who were born prematurely and who go on to develop focal segmental glomerulosclerosis.


"Premature babies with very low birth weights may develop renal disease in adolescence or adulthood that is a consequence of retarded kidney development and overwork of the kidney. Doctors need to be aware of this association so that the condition is not misdiagnosed or treated inappropriately," said Dr. D'Agati.


The study will appear in the January 2009 issue of the Clinical Journal of the American Society Nephrology (CJASN). (ANI)


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