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ANOVULATION

Learn about anovulation causes, PCOS pathophysiology, diagnosis criteria, and management strategies. Explore hormonal imbalances, insulin resistance, obesity impact, and exclusion of other disorders for comprehensive understanding.

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ANOVULATION

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  1. ANOVULATION CEM FICICIOGLU, M.D, Ph.D.,AA.,MBA

  2. Central defect • Anormal feedback signals • Local ovarian conditions • Obesity

  3. Central defect Emotional Nutritional (weight loss, eating disorders) Physical stress (excessive exercise) Pituitary tumors Hyperprolactinemia Anormal gonadotropin secretory dynamics

  4. Anormal feedback signals Chronically elevated estrogen concentration Failure of the LH surge

  5. Local ovarian conditions

  6. Obesity 1. Increased peripheral aromatization of androgens, resulting in chronically elevated estrogen concentrations. 2. Decreased levels of hepatic SHBG production, resulting in increased circulatingconcentrations of free estradiol and testosterone. 3. Insulin resistance, leading to a compensatory increase in insulin levels that stimulatesandrogen production in the ovarian stroma, resulting in high local androgenconcentrations that impair follicular development

  7. Defining the Cause of Anovulation • Ovarian failure. Hypergonadotropic hypogonadism • Central defects. Hypogonadotropic hypogonadism • Hypothalamic-pituitary-ovarian dysfunction

  8. PCOS • The most obvious and common condition associated with chronic anovulation • 4–6% of reproductive age women PCOS does not cause anovulation; rather, PCOS is the consequence of chronic anovulation

  9. PCOS- PATHOPHYSİOLOGY • PCOS is a complex disorder, similar to cardiovascular disease and type 2 diabetes mellitus, wherein numerousgenetic variants and environmental factors interact, combine, and contribute to the pathophysiology

  10. PCOS- PATHOPHYSİOLOGY

  11. PCOS- PATHOPHYSİOLOGY • İncreased serum LH concentrations • Low-normal FSH levels • Increased LH:FSH ratios • Chronically elevated estrone concentrations (derived from peripheral aromatization of increased androstenedione) • Normal ormodestly increased levels of inhibin B (derived from small follicles) • Increased ovarian androgen production • Increased circulating insulin levels

  12. PCOS- PATHOPHYSİOLOGY • Insulin resistance is a common feature in obese and, to a lesser extent, lean womenwith PCOS • The overall prevalence ranges between 50% and 75% • Up to 35% of women with PCOS exhibit impaired glucose tolerance • 7–10% meet criteria for type 2 diabetes mellitus

  13. PCOS- PATHOPHYSİOLOGY Increased circulating insulin levels Increased ovarian androgen production Inhibiting hepatic SHBG production Hyperandrogenism

  14. PCOS- PATHOPHYSİOLOGY

  15. PCOS- PATHOPHYSİOLOGY

  16. PCOS- PATHOPHYSİOLOGY • Insulin resistance and hyperinsulinemia are undoubtedly an important part of the pathophysiology of PCOS • Insulin resistance and hyperinsulinemia are not the primary cause or pathogenic factor in all women with PCOS • 25–50% of women with PCOS have no demonstrable insulin resistance

  17. PCOS- PATHOPHYSİOLOGY • Obesity relates primarily to genetic and environmental factorsand is a common, but not essential, feature of PCOS • Obesity contributes modestly to therisk for developing PCOS and adds to thepathophysiology in already affected women byaggravating the degree of insulin resistance and hyperinsulinemia

  18. PCOS- PATHOPHYSİOLOGY Increased LH stimulation + hyperinsulinemia + obesity Hyperandrogenism is the key feature of PCOS

  19. PCOS- PATHOPHYSİOLOGY

  20. PCOS- DİAGNOSİS • ESHRE-ASRM, Rotterdam, 2003; at least two of three major criteria: (1) oligo/anovulation (2) clinical or biochemical signs of hyperandrogenism (3) polycystic ovaries (as identifi ed by ultrasonography), also excluding other androgen excess disorders

  21. PCOS- DİAGNOSİS • AE-PCOS, 2006: (1) hyperandrogenism (hirsutism and/or hyperandrogenemia) (2) ovarian dysfunction (oligo/anovulation and/or polycystic ovaries) (3) exclusion of other androgen excess or related disorders

  22. PCOS- DİAGNOSİS • Evaluation of women with suspected polycystic ovary syndrome should include: 1. Serum thyroid-stimulating hormone (TSH) 2. Serum prolactin 3. 2-hour oral glucose tolerance test 4. Fasting lipid profi le 5. Endometrial sampling (in women whose history indicates potential long-termexposure to unopposed estrogen stimulation) 6. Serum testosterone (in women with moderate or severe hirsutism) 7. Morning follicular phase serum 17-hydroxyprogesterone (in women witha pre- or perimenarcheal onset of hirsutism, a family history of congenitaladrenal hyperplasia, or high-risk ethnicity) 8. Overnight dexamethasone suppression test (in women with signs or symptoms of hypercortisolism)

  23. Exclusion of Other Androgen Excess Disorders • Thyroid Disorders • Hyperprolactinemia • Nonclassical Congenital Adrenal Hyperplasia • Androgen-Secreting Ovarian and Adrenal Tumors • Severe Insulin Resistance Syndromes • Cushing Syndrome • Idiopathic Hirsutism

  24. Exclusion of Other Androgen Excess Disorders

  25. PCOS- Clinical management The management of women with PCOS should seek tocorrect or prevent both its immediateand longer-term clinical consequences, which may include all of the following: ● Menstrual abnormalities. ● Increased risk for developing endometrialhyperplasia and neoplasia. ● Hyperandrogenism (hirsutism, acne, alopecia). ● Infertility. ● Increased risk for developing type 2 diabetes. ● Increased risk for developing cardiovascular disease

  26. PCOS- Clinical management • Estrogen-progestin contraceptives • Cyclic or continuous treatment with progestins alone • Insulin sensitizing agents (metformin, thiazolidinediones) • Cosmetic measures (shaving, plucking, waxing, depilatories) • Antiandrogens (e.g., spironolactone, cyproterone acetate, flutamide).

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