anovulation


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anovulation

 
absence of ovulation.

an·ov·u·la·tion

(an'ov-ū-lā'shŭn),
Suspension or cessation of ovulation.

anovulation

/an·ov·u·la·tion/ (an″ov-u-la´shun) absence of ovulation.

anovulation

(ăn-ō′vyə-lā′shən, -ŏv′yə-)
n.
The failure, cessation, or suppression of ovulation.

anovulation

[an′ovyəlā′shən]
a failure of the ovaries to produce, mature, or release ova. The condition may result from ovarian immaturity or postmaturity; altered ovarian function, as in pregnancy and lactation; primary ovarian dysfunction, as in ovarian dysgenesis; or disturbed interaction of the hypothalamus, pituitary gland, and ovary caused by stress or disease. Oral contraceptives suppress ovulation. Anovulation may also be an adverse side effect of medications prescribed in the treatment of other disorders. anovular, anovulatory, adj.

an·ov·u·la·tion

(an'ov-yū-lā'shŭn)
Suspension or cessation of ovulation.

anovulation

Failure of the ovaries to produce eggs so that conception is impossible. This may result from low levels of gonadotrophin-releasing hormone, excess prolactin, pituitary failure, excessive exercise, anorexia nervosa, stress, KALLMAN'S SYNDROME, SHEEHAN'S SYNDROME, pituitary tumours, excess radiation to the brain, or from natural states such as pregnancy and lactation. Anovulation is also caused by oral contraceptives.

Anovulation

The absence of ovulation.

anovulation

failure to ovulate. The animal may show signs of estrus but the ovum is not shed and fertilization does not take place. This sequence of events can be observed by rectal examination in the cow and mare and by peritoneoscopy in smaller species.
References in periodicals archive ?
The diagnosis of PCOS was made according to Rotterdam Revised Criteria (2004) (14) including oligo and/or anovulation, clinical and/or biochemical hyperandrogenemia and polycystic ovaries by ultrasound with exclusion of patients with hyperprolactinemia, congenital adrenal hyperplasia, known androgen secreting neoplasm, and thyroid disease.
Key Words: uterine bleeding, anovulation, menorrhagia, oligomenorrhea
This anovulation was associated with a reduced or absent pituitary LH secretion.
The insertion of four pellets led to anovulation in 92% of women studied.
The most common cause of female infertility is anovulation, which is brought about by irregularities in the hormones needed to produce and release healthy eggs.
Diagnosis and Management of Infertility Due to Anovulation (Alfredo Guilln Antn and Juan A Garca Velasco)
Polycystic ovary syndrome (PCOS) is manifested by the combined presence of hyperandrogenism, chronic oligo- or anovulation, and polycystic ovaries.
They tend to be more common in overweight or obese patients, patients with longstanding anovulation or polycystic ovarian syndrome (PCOS), or patients placed on unopposed estrogen.
The causal factor for anovulation may be the presence of LH in the FSH preparation, which alters the endocrine and ovarian function after administration of a high dosage of exogenous gonadotrophin, and results in a smaller size and defective maturation of follicles (Murphy et al.
They describe the categorization of patients, initial work-up and diagnosis, the use of transvaginal sonography for assessment, semen analysis, graphical evaluation of the fallopian tubes and uterus, fallopian tube recanalization, endoscopy and laparoscopy, anovulation, polycystic ovarian syndrome, ovulation induction, new drugs, thyroid and hyperprolactinemia in infertility, the role of endometriosis, the luteal phase defect in infertility, unexplained infertility, pelvic inflammatory disease, fibroids, cervical factors, the evaluation and treatment of male infertility, intrauterine insemination, and assisted reproductive technology.
The most common characteristics of PCOS are anovulation or infrequent ovulation usually resulting in amenorrhea or oligomenorrhea, hirsutism and/ or acne, multiple ovarian cysts, infertility, and obesity.
According to the most widely used diagnostic criteria (Rotterdam Criteria for Diagnosis of PCOS), at least two of the following need to be present to confirm a diagnosis (after excluding other causes): oligoovulation and/or anovulation (associated with irregular (or cessation of) menstruation), hyperandrogenism (demonstrated clinically by increased body hair, and in more severe cases, hair loss), and polycystic ovaries, with the exclusion of other aetiologies.