Menstruation and menstrual disorders

2,504 views
2,256 views

Published on

2 Comments
11 Likes
Statistics
Notes
No Downloads
Views
Total views
2,504
On SlideShare
0
From Embeds
0
Number of Embeds
4
Actions
Shares
0
Downloads
210
Comments
2
Likes
11
Embeds 0
No embeds

No notes for slide

Menstruation and menstrual disorders

  1. 1. MENSTRUATION AND MENSTRUAL DISORDERS Asomma Kubire
  2. 2. Objectives • Understand hormonal changes in menstrual cycle • Understand ovarian changes in menstrual cycle • Understand endometrial changes in menstrual cycle • Identify, diagnose and treat some abnormalities of menstruation
  3. 3. Stages of menstrual cycle • • • • • • Follicular phase (Proliferative phase) Luteal phase (Secretory phase) Cycle ranges between 25 and 32 days Menstrual flow is for 4-6 days Luteal phase lasts between 12 and 16 days Luteal phase is usually reported to be of constant duration – 14 days
  4. 4. Organs involved in menstrual cycle • • • • Hypothalamus Anterior pituitary Ovary Uterus (Endometrium)
  5. 5. Hormones in menstrual cycle • Gonadotrophin Releasing Hormone (GnRH) • Follicle Stimulating Hormone (FSH) • Luteinising Hormone (LH) • Estrogen • Progesterone
  6. 6. Pituitary and Hypothalamic events • Atrophy of the corpus luteum with falling progesterone and estrogen levels initiates the menstrual cycle • Low estrogen and progesterone levels cause GnRH secretion by the hypothalamus • GnRH acts on the pituitary to secrete FSH and LH • FSH initiates development of the follicles in the ovary
  7. 7. Ovarian events • FSH causes development of 18-20 follicles • Developing follicles produce estrogen through action of FSH and LH • One follicle becomes dominant follicle • Rising estrogen levels inhibit FSH and LH • All follicles except dominant follicle undergo atresia • Rising estrogen levels from dominant follicle cause LH surge • LH surge brings about ovulation
  8. 8. Post ovulatory events • Corpus luteum (CL) is formed after ovulation • CL produces progesterone and estrogen • Hormones from CL maintain endometrium until CL undergoes atresia • Atresia of CL leads to shedding of endometrium – menses- and initiation of another cycle
  9. 9. Hormonal Events • Negative feedback • Positive feedback • LH surge starts 34-36 hours before ovulation • Peak of LH surge is 10-12 hours before ovulation
  10. 10. Ovarian Events • Stages of follicle development – primordial, primary, secondary, tertiary, graafian • Recruitment of follicles • Emergence of dominant follicle • Ovulation • Corpus luteum formation
  11. 11. Endometrial Events • Changes are due to estrogen and progesterone • Proliferative phase is characterised by increase in growth of endometrium – primarily glandular growth • Glands are narrow and tubular with mitoses and pseudostratification
  12. 12. Endometrial events • Luteal phase changes are used to date the the cycle • Day 16 – pseudostratification and subnuclear vacuoles: first sign of ovulation • Day 17 – glands are tortuous and dilated • Day 18 –vacuoles are beside nuclei • Day 19 – pseudostratiication and vacuoles have disappeared
  13. 13. Endometrial events • Day 21,22 – edematous endometrial stroma • Day 23 – stromal mitosis starts • Day 24 – predecidual cells surrounded by spiral arterioles and numerous stromal mitoses • Day 25 – predecidual cells begin to differentiate under surface epithelium • Day27 – upper portion of endometrial stroma made up of well-diffrentiated decidua-like cells
  14. 14. Menstrual disorders • Dysmenorrhea • Menorrhagia • Amenorrhea
  15. 15. Menstrual disorders • Dysmenorrhea: Painful lower abdominal cramps occurring just before or during the menses • Primary dysmenorrhea begins at or shortly after menarche • Secondary dysmenorrhea occurs well after menarche and is associated with pelvic pathology
  16. 16. Menstrual disorders • Primary dysmenorrhea is due to abnormalities of prostaglandin metabolism • Secondary dysmenorrhea – pelvic infection, uterine fibroids, endometriosis, adenomyosis
  17. 17. Treatment of dysmenorrhea • Primary: NSAIDS and oral contraceptives • Secondary: Treatment of underlying cause
  18. 18. Menstrual disorders • Menorrhagia is prolonged (more than 7 days) or excessive (over 80ml) uterine bleeding occrring at regular intervals • Dysfunctional uterine bleeding: Excessive uterine bleeding with no demonstrable organic cause
  19. 19. Menstrual disorders • DUB is due to abnormalities of prostaglandin metabolism • Menorrhagia – gynaecolgical causes, endocrine causes, haematologic causes
  20. 20. Causes of menorrhagia • • • • • Uterine fibroids Adenomyosis Endometrial CA Hypothyroidism Bleeding disorders
  21. 21. Menstrual disorders • Amenorrhea: absence of menses during the reproductive years • Primary amenorrhea: Absence of spontaneous menses in an individual older than 16 • Secondary amenorrhea: absence of menses in an individual who has previously had spontaneous menstrual periods
  22. 22. Causes of secondary amenorrhea • • • • • • • • Pregnancy Anovulation PCOS Intrauterine synechiae Secondary Vaginal atresia Hyperprolactinaemia Pituitary tumours Cushing’s syndrome • Hyperthyroidism • Premature ovarian failure • Hypothalamic pituitary dysfunction • Stress • Severe weight loss • General medical disorders • Adrenal tumours
  23. 23. Causes of primary amenorrhea • Turner’s syndrome • CNS tumours • Androgen insensitivity (Testicular feminisation syndrome) • Hyperprolactinaemia • Congenital adrenal hyperplasia • • • • • • • • Vaginal atresia Imperforate hymen Mullerian abnormalities Hyperthyroidism Late development Stress Low body weight Adrenal tumours
  24. 24. Investigation of secondary amenorrhea • • • • • • • • • History and examination Pregnancy test Progesterone challenge FSH, LH assay Serum prolactin Thyroid function tests CT scan / lateral skull X-ray Hysterosalpingogram USG
  25. 25. Investigation of primary amenorrhea • • • • • • • • History Examination Chromosomal studies FSH, LH assay Serum prolactin CT scan USG Laparoscopy

×