21-Hydroxylase Deficiency overview

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Template:21-Hydroxylase Deficiency Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

Congenital adrenal hyperplasia due to 21-hydroxylase deficiency (21-OH CAH), in all its forms, accounts for about 95% of diagnosed cases of congenital adrenal hyperplasia, and "CAH" in most contexts refers to 21-hydroxylase deficiency.

  • Severe 21-hydroxylase deficiency causes salt-wasting CAH, with life-threatening vomiting and dehydration occurring within the first few weeks of life. Severe 21-hydroxylase deficiency is also the most common cause of ambiguous genitalia due to prenatal virilization of genetically female (XX) infants.
  • Moderate 21-hydroxylase deficiency is referred to as simple virilizing CAH; and typically is recognized as causing virilization of prepubertal children.
  • Still milder forms of 21-hydroxylase deficiency are referred to as non-classical CAH and can cause androgen effects and infertility in adolescent and adult women.

References

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