From Wikipedia, the free encyclopedia
Dysmenorrhea (or
dysmenorrhoea) is a medical condition
characterized by severe uterine pain
during menstruation. While most women experience
minor pain during menstruation, dysmenorrhea is diagnosed when the
pain is so severe as to limit normal activities, or require medication.
Dysmenorrhea can feature different kinds of pain, including
sharp, throbbing, dull, nauseating, burning, or shooting pain.
Dysmenorrhea may precede menstruation by several days or may
accompany it, and it usually subsides as menstruation tapers off.
Dysmenorrhea may coexist with excessively heavy blood loss, known as menorrhagia.
Secondary dysmenorrhea is diagnosed when symptoms are
attributable to an underlying disease, disorder, or structural abnormality either
within or outside the uterus. Primary dysmenorrhea is diagnosed
when none of these is detected.
Primary
dysmenorrhea
Pathophysiology
During a woman's menstrual cycle, the endometrium thickens in preparation for
potential pregnancy.
After ovulation, if the
ovum is not fertilized and there is no
pregnancy, the built-up uterine tissue is not needed and thus
shed.
Molecular compounds called prostaglandins are released during
menstruation, due to the destruction of the endometrial cells, and
the resultant release of their contents.[1]
Release of prostaglandins and other inflammatory
mediators in the uterus cause
the uterus to contract. These substances are thought to be a major
factor in primary dysmenorrhea.[2] When
the uterine muscles contract, they constrict the blood supply to the
tissue of the endometrium, which, in turn, breaks down and dies.
These uterine contractions continue as they squeeze the old, dead
endometrial tissue through the cervix and out of the body through the vagina. These contractions, and
the resulting temporary oxygen deprivation to nearby tissues, are
responsible for the pain or "cramps" experienced during
menstruation.
Compared with other women, females with primary dysmenorrhea
have increased activity of the uterine muscle with increased
contractility and increased frequency of contractions.[3]
Signs and
symptoms
The main symptom of dysmenorrhea is pain concentrated in the
lower abdomen, in the
umbilical region or the suprapubic region of the abdomen. It is
also commonly felt in the right or left abdomen. It may radiate to
the thighs and lower back. Other symptoms may
include nausea and vomiting, diarrhea or constipation, headache, dizziness, disorientation,
hypersensitivity to sound, light, smell and touch, fainting,
and fatigue. Symptoms of dysmenorrhea
often begin immediately following ovulation and can last until the
end of menstruation. This is because dysmenorrhea is often
associated with changes in hormonal levels in the body that occur
with ovulation. The use of certain types of birth control pills can
prevent the symptoms of dysmenorrhea, because the birth control
pills stop ovulation from occurring.
Etiology
In a systematic review, an age of less than 30 years, a low body mass
index, smoking, early menarche (< 12 years),
long menstrual
cycles, heavy menstrual flow, nulliparity, premenstrual syndrome, sterilization,
clinically suspected pelvic inflammatory
disease, sexual
abuse, and psychological symptoms were associated with
dysmenorrhea.[4]
Diagnosis
In one research study using MRI, visible features of the uterus were
compared in dysmenorrheic and eumenorrheic (normal) participants.
The study concluded that in dysmenorrheic patients, visible
features on cycle days 1-3 correlated with the degree of pain, and
differed significantly from the control group.[5]
Treatments
Nutritional
Several nutritional supplements have been indicated as
effective in treating dysmenorrhea, including omega-3 fatty
acids, magnesium, vitamin E, zinc, and thiamine (vitamin B1).
Research indicates that one mechanism underlying dysmenorrhea is
a disturbed balance between anti-inflammatory, vasodilator eicosanoids derived from omega-3 fatty acids, and proinflammatory, vasoconstrictor
eicosanoids derived from omega-6 fatty
acids.[6]
Several studies have indicated that intake of omega-3 fatty acids
can reverse the symptoms of dysmenorrhea, by decreasing the amount
of omega-6 FA in cell membranes.[7] [8][9] The
richest dietary source of omega-3 fatty acids is found in flax
oil.[10]
Oral intake of magnesium has also been indicated
in providing relief: two double-blind, placebo-controlled studies
demonstrated a positive therapeutic effect of magnesium on
dysmenorrhea.[11] [12] A
randomized, double-blind, controlled trial demonstrated that oral
intake of vitamin E relieves the pain of primary dysmenorrhea and
reduces blood loss.[13] A
review of case histories indicated that zinc, in 1 to 3 30-milligram doses given daily for one to four
days prior to onset of menses, prevents essentially all to all
warning of menses and all menstrual cramping.[14]
Intake of thiamine (vitamin B1) was demonstrated to
provide "curative" relief in 87% of females experiencing
dysmenorrhea, in a controlled study.[15]
NSAIDs
Non-steroidal anti-inflammatory drugs
(NSAIDs) are effective in relieving the pain of primary
dysmenorrhea.[16]
NSAIDs can have side effects of nausea, dyspepsia, peptic ulcer, and
diarrhea.[17]
Patients who cannot take the more common NSAIDs, or for whom they
are not effective, may be prescribed a COX-2 inhibitor.[18]
One study indicated that conventional therapy with NSAIDs "provides
symptomatic relief but has increasing adverse effects with
long-term use",[19]
another indicated that long-term use of NSAIDs has "severe adverse
effects".[20]
Hormonal
contraceptives
Although use of hormonal contraception can
improve or relieve symptoms of primary dysmenorrhea,[21][22]
a 2001 systematic review found that no conclusions can be made
about the efficacy of commonly used modern lower dose combined oral
contraceptive pills for primary dysmenorrhea.[23] Norplant[24] and
Depo-provera[25][26]
are also effective, since these methods often induce amenorrhea. The IntraUterine System (Mirena IUD) has been
cited as useful in reducing symptoms of dysmenorrhea.[27]
Non-drug
therapies
Several non-drug therapies for dysmenorrhea have been studied,
including behavioral, acupuncture, acupressure, chiropractic
care, and the use of a TENS unit.
Behavioral therapies assume that the physiological process
underlying dysmenorrhea is influenced by environmental and
psychological factors, and that dysmenorrhea can be effectively
treated by physical and cognitive procedures that focus on coping
strategies for the symptoms rather than on changes to the
underlying processes. A 2007 systematic review found some
scientific evidence that behavioral interventions may be effective,
but that the results should be viewed with caution due to poor
quality of the data.[28]
Acupuncture and acupressure are used to treat dysmenorrhea. A
review cited four studies, two of which were patient-blind,
indicating that acupuncture and acupressure were effective.[29]
This review stated that the treatments appear "promising" for
dysmenorrhea, and that the researchers considered further studies
to be justified. Another study indicated that acupuncture "reduced
the subjective
perception of dysmenorrhea",[30]
still another indicated that adding acupuncture in patients with
dysmenorrhea was associated with improvements in pain and quality of
life.[31]
Although claims have been made for chiropractic care, under the theory that
treating subluxations in the spine may
decrease symptoms,[32] a
2006 systematic review found that overall no evidence suggests that
spinal
manipulation is effective for treatment of primary and
secondary dysmenorrhea.[33]
Treatment with a transcutaneous
electrical nerve stimulation (TENS) unit, often used for chronic pain, was
indicated as effective in several studies.[34]
[35] [36][37]
One study encouraged providers to try the TENS unit with patients,
on the grounds that they found it to be "non-invasive,
efficient, and easy to use".[38]
A study led by the same researchers reported proof of TENS'
effectiveness.[39]
Other medications and
herbal therapies
Other medications and herbal therapies have been studied in the
treatment of dysmenorrhea. A 2008 systematic review found promising
evidence for Chinese herbal
medicine for primary dysmenorrhea, but that the evidence was
limited by its poor methodological quality.[40] One
study indicated that two Japanese herbal medicines
provided all of the study participants with complete relief.[41]
A review indicated the effectiveness of use of transdermal nitroglycerin.[42]
A double-blind, controlled study indicated that treatment with an
extract of guava leaf resulted in significant reduction of
symptoms.[43]
In a small double-blind, placebo-controlled study, guaifenesin reduced
primary dysmenorrhea, but the effect was not significant.[44]
Hormonal
treatments
One study suggested that vasopressin antagonists with V1(a)
selectivity might be useful in treating a variety of disorders,
including dysmenorrhea.[45]
Prognosis
A survey in Norway showed
that 14 percent of females between the ages of 20 to 35 experience
symptoms so severe that they stay home from school or work.[46]
Among adolescent girls, dysmenorrhea is the leading cause of
recurrent short-term school absence in this group.[47]
Epidemiology
Reports of dysmenorrhea are greatest among individuals in their
late teens and 20s, with reports usually declining with age. One
study indicated that 67.2% of adolescent females
experienced dysmenorrhea.[48]
A study of Hispanic
adolescent females indicated a high prevalence and impact in this
group.[49]
Another study indicated that dysmenorrhea was present in 36.4% of
participants, and was significantly associated with lower age and
lower parity.[50]
Childbearing is said to relieve
dysmenorrhea, but this does not always occur. One study indicated
that in nulliparous women with primary
dysmenorrhea, the severity of menstrual pain decreased
significantly after age 40. [51]
A questionnaire
concluded that menstrual problems, including dysmenorrhea, were
more common in females who had been sexually abused.[52]
Secondary
dysmenorrhea
Secondary dysmenorrhea is dysmenorrhea which is associated with
an existing condition. The most common cause of secondary
dysmenorrhea is endometriosis.[47]
Other causes include leiomyoma,[53]
adenomyosis,[54]
ovarian cysts, and
pelvic congestions.[55]
The presence of a copper IUD can also cause dysmenorrhea.[56][57]
In patients with adenomyosis, the levonorgestrel intrauterine system (Mirena) was
observed to provide relief.[58]
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External
links
Dysmenorrhea at the Open
Directory Project