Clinical meaning
The NP integrates advanced pathophysiological knowledge of common gynecological conditions to guide diagnosis and management. Polycystic ovary syndrome (PCOS) is the most common endocrine disorder in reproductive-age women (6-12% prevalence), diagnosed using the Rotterdam criteria requiring 2 of 3: oligo/anovulation, clinical or biochemical hyperandrogenism, and polycystic ovarian morphology on ultrasound (12+ follicles per ovary or ovarian volume greater than 10 mL). The pathophysiology involves hypothalamic GnRH pulse frequency dysregulation leading to increased LH:FSH ratio (typically greater than 2:1), which stimulates theca cell androgen production while insufficient FSH prevents follicular maturation, causing anovulation and cyst formation. Insulin resistance occurs in 50-70% of PCOS patients independent of BMI, amplifying ovarian androgen production through direct stimulation of theca cells and reduction of hepatic sex hormone-binding globulin (SHBG), increasing free testosterone. Endometriosis is characterized by the presence of endometrial-like tissue outside the uterus, most commonly on the ovaries, fallopian tubes, uterosacral ligaments, and pelvic peritoneum. Retrograde menstruation (Sampson theory) is the most accepted etiology: menstrual endometrial fragments reflux through the fallopian tubes and implant on pelvic structures, where they respond to cyclic hormonal stimulation, producing chronic inflammation, fibrosis, and adhesion formation. Endometriomas (chocolate cysts) form when endometrial implants on the ovary create blood-filled cystic structures. Uterine fibroids (leiomyomas) are benign monoclonal smooth muscle tumors arising from the myometrium, classified by location: intramural (within the myometrial wall, most common), submucosal (projecting into the uterine cavity, most likely to cause heavy bleeding), and subserosal (projecting outward from the uterus, may cause bulk symptoms). Fibroids are estrogen and progesterone dependent, growing during reproductive years and typically shrinking after menopause. Ovarian cysts include functional cysts (follicular cysts from failed ovulation and corpus luteum cysts, which typically resolve spontaneously within 1-3 cycles) and pathological cysts (dermoid/mature teratomas, endometriomas, cystadenomas). Abnormal uterine bleeding (AUB) is classified using the PALM-COEIN system: structural causes (Polyp, Adenomyosis, Leiomyoma, Malignancy) and non-structural causes (Coagulopathy, Ovulatory dysfunction, Endometrial, Iatrogenic, Not yet classified).