MENSTRUATION+%282%29

Introduction

Menstruation Overview Presenting Author: Harriet Jimenez, MN LPT

Menstrual Cycle

DefinitionAlso known as the Female Reproductive Cycle, it refers to episodic uterine bleeding resulting from cyclic hormonal changes.

Key Processes

  • Complex interplay among endometrium, hypothalamus, pituitary glands, and ovaries.

  • Primary purposes:

    • To mature an ovum.

    • To renew the uterine tissue bed.

Factors Influencing Menstrual Cycle Regularity

  • Age: Changes in hormonal levels as women age.

  • Physical and Emotional Status: Stress, health conditions, and lifestyle can affect cycles.

  • Environmental Influence: External factors such as climate, nutrition, and exposure to toxins.

Key Terms in the Menstrual Cycle

  • Follicle Development:

    • Graafian Follicle: Activated oocyte by FSH that matures into an ovum with a follicular membrane and fluid.

    • Ovulation: Release of a mature egg from the ovary (~day 14, not necessarily the 14th day).

  • Post-Ovulation Changes:

    • Corpus Luteum: Remaining follicle produces lutein (rich in progesterone); essential for maintaining uterine lining.

    • Progesterone: Hormone that is thermogenic and supports early pregnancy.

    • Corpus Albicans: Regressed corpus luteum replaced by fibrous tissue if no fertilization occurs.

Calculating Average Menstrual Cycle

  • Keep records of menstruation for at least three consecutive months to determine average.

Menarche and Puberty

Definitions

  • Puberty: Transitional stage from childhood to sexual maturity.

  • Menarche: The onset of the first menstruation.

Characteristics of Initial Menstrual Periods

  • Initially irregular, unpredictable, painless, and anovulatory (no ovulation).

  • Regularity often achieved after one year or more.

Menstrual Cycle Characteristics

  • Cycle Length:

    • Varies per individual; average is 28 days.

    • Average menstrual flow lasts approximately 4-6 days.

  • How to Count:

    • Count from the first day of one menstrual cycle to the first day of the next.

Characteristics of Normal Menstrual Cycles

Characteristic

Description

Menarche

Average at 12 or 13 years old; range of 9-17 years.

Interval

Average 28 days; not unusual for 23-35 day cycles.

Flow Duration

Average 5 days; range of 3-6 days.

Flow Amount

50 mL (20-80 mL) per period.

Color

Dark red; mixture of blood, mucus, and endometrial cells.

Physiology of Menstrual Cycle

Structures Involved:

  • Hypothalamus

  • Pituitary Gland

  • Ovaries

  • Uterus

Hormonal Regulation

Hormonal Interactions

  • GnRH Release: Initiates menstrual cycle.

  • Anterior Pituitary Gland produces LH and FSH under GnRH influence:

    • FSH: Stimulates growth of ovarian follicles.

    • LH: Triggers ovulation and promotes the formation of the corpus luteum.

    • FSH stimulates estrogen production; LH triggers ovulation and subsequent progesterone production from the corpus luteum, preparing the endometrium for possible implantation.

Ovulation Timing

  • For a 28-day cycle, ovulation typically occurs around day 14.

  • For a 30-day cycle, ovulation occurs around day 16.

Menstrual Cycle Mechanics

  • Understanding how the menstrual cycle operates is critical.

Menses Composition

Menstrual Flow Comprises:

  • Blood from ruptured capillaries.

  • Mucin from glands.

  • Fragments of endometrial tissue.

  • Microscopic unfertilized ovum.

Start of CycleThe first day of menstrual flow marks the onset of a new cycle.

Average Blood Loss

  • Blood loss during menstruation typically ranges from 20-80 mL.

  • Average iron loss approximates 11 mg.

Overview of the Menstrual Cycle

Cycle Phases:

  • Pre-Ovulation: Follicular phase

  • Post-Ovulation: Luteal phase

  • Uterine Cycle Phases: Period, proliferative, secretory.

Ovarian Cycle Phases

Phases of Ovarian Cycle:

  • Follicular Phase

  • Ovulation Phase

  • Luteal Phase

  • Menstrual Phase

Ovarian Structure

Anatomy of the Ovary:

  • Includes primary follicles, primordial oocyte, secondary follicles, and structures such as corpus luteum and corpus albicans.

Health Education for Menstruation

Importance of Menstrual Health Education:Critical for all genders to grasp the processes and discussions surrounding menstruation.

Common Menstrual Myths

  • Hair washing during menses is harmful.

  • Planting vegetables should not occur during periods.

  • Sour foods exacerbate cramps.

Education Benefits

  • Elevates girls' self-concept and fosters trust in bodily changes.

  • Boys learn the significance and phases of women’s reproductive systems, promoting active understanding and role in reproduction and health.

Pain Relief Strategies

  • Utilizing prostaglandin inhibitors (e.g., ibuprofen) and applying heat can alleviate menstrual pain.

  • Strategies may include yoga, meditation, and guided imagery to reduce discomfort.