Oocyte Overripeness Relation to Multiple Pregnancy An Epidemiologic Study

Papiernik-Berkhauer, E; Ades, AE; Konwinski, T.

doi:10.1017/s1120962300024677

Cited by 3 publications

(2 citation statements)

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“…The increase of the DZ rate by maternal age is common to ali countries. Several explanations, including menopausal postponement [30], gonadotropin secretion [8,24], high coital rates [14], and overripeness of cocyte [25] have been proposed. Bothgenetic and environmental factors might be involved in the increase of MZ rates by maternal age.…”

Section: Discussionmentioning

confidence: 99%

Epidemiological Characteristics of Twinning Rates in Taiwan

Chen

Lin

Chang

et al. 1987

Acta genet. med. gemellol.: twin res.

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Delivery records of public hospitals and birth certificates of household registration offices were examined to study the epidemiological characteristics of twinning rate from 1955 to 1984 in Taiwan. The MZ twinning rate was consistently higer than the DZ rate during the study period. The DZ rate declined steadily from 2.7 per 1000 in 1955 to 1.3 per 1000 in 1975, and then gradually increased to 3.6 per 1000 in 1984. The MZ rate peaked periodically in 1956, 1966 and 1976, and gradually increased from 3.3 per 1000 in 1978 to 5.9 per 1000 in 1986. Both MZ and DZ rates were higher in urban than in rural areas and they were also higher in northern Taiwan than elsewhere in the island. While both MZ and DZ rates increased with maternal age and parity, the maternal age difference and the parity difference were more striking in DZ than in MZ rates. The international comparison also showed a greater racial difference in maternal age-specific DZ than MZ twinning rates; and the older the maternal age, the greater the international discrepancy in DZ rates.

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Section: Discussionmentioning

confidence: 99%

Epidemiological Characteristics of Twinning Rates in Taiwan

Chen

Lin

Chang

et al. 1987

Acta genet. med. gemellol.: twin res.

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“…Epidemiological studies demonstrate Ushaped ( Fig. 1) or J-shaped frequency curves related to the age of the mother for monozygotic twins (16,49), hydatidiform mole (46), spontaneous abortion (5,56,65), pre-eclamptic toxemia (9, 10), single umbilical artery (3), abruptio placentae (47), intra-uterine growth retardation (11,48,60), perinatal mortality (15,53,71), stillbirths and congenital anomalies (6,7,25,64,65), and intellectual impairment of children (41). A same U, or at least a J-shaped, curve may be presumed in patients with gonosomal as well as autosomal chromosome aberrations.…”

Section: Conceptions In Adolescents and Pre-menopausal Womenmentioning

confidence: 99%

Preovulatory Overripeness of the Egg in the Human Subject

Jongbloet

Zwets

1976

Intl J Gynecology & Obste

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Anomalies of conception which endanger the ensuing pregnancy have been reviewed. The range of possible consequences include “occult” and early spontaneous abortions, a wide spectrum of chromosome defects, developmental anomalies, such as those of the brain (with a wide range of neuro‐psychopathology as a consequence) and possibly some other abnormalities of gestation. Pathology either of the pregnancy or of the products of conceptions caused by preovulatory overripeness ovopathy may be expected from conceptions that occur at times of changing endocrine patterns, reflected clinically in a transition from anovulation and vice versa. One can anticipate finding this conceptopathology reflected epidemiologically in a U‐shaped curve in relation to the reproductive age of the mother, in another U‐shaped curve relevant to the duration of the conception interval, and finally in a 4‐peaked birth curve related to seasonal variations of the ovulatory patterns.

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The Aging of Gametes, Heteroploidy, and Embryonic Death

Bomsel-Helmreich

1976

Intl J Gynecology & Obste

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Experimental evidence obtained from amphibians as well as from mammals reveals what role the aging process of gametes plays in the pathogenesis of reproductive wastage in virtually all animals. The data indicate that senescence may affect gametes of both sexes and that it may occur both before and after ovulation and ejaculation respectively. A wide range of reproductive abnormalities may be caused by time‐related phenomena including fetal developmental and chromosome defects, twinning, abortion and possibly others. The pathological mechanism of these anomalies, as reflected in the experimental findings, is discussed in some detail.

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Oocyte Overripeness Relation to Multiple Pregnancy An Epidemiologic Study

Cited by 3 publications

References 0 publications

Epidemiological Characteristics of Twinning Rates in Taiwan

Epidemiological Characteristics of Twinning Rates in Taiwan

Preovulatory Overripeness of the Egg in the Human Subject

The Aging of Gametes, Heteroploidy, and Embryonic Death

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