MULTIPLE PREGNANCY
HANAN MOSTAFA RIZK;
Abstract
Multiple pregnancy is one of the most interesting events in obstetrics. It refers to gestations in which there are two or more fetuses (Alvarez and Berkowitz, 1990).
Multiple gestations constitute less than 1% of all births (Kovacs et al., 1989). Dizygotic twins occur when two separate ova are fertilized by two separate spermatozoa. The incidence of dizygotic twins is influenced remarkably by race, heredity, maternal age, parity and especially fertility drugs (MacGillivray, 1986).
On the other hand, monozygotic twins result from fertilization of a single ovum that subsequently divides. Depending upon the time interval between fertilization and cleavage of the embryo, different placental membrane relationships may result. Monozygotic twinning seems to occur at a fairly constant ratio throughout the world at between 3-5 per
1000 births (Benirschke, 1990).
Multiple gestations constitute less than 1% of all births (Kovacs et al., 1989). Dizygotic twins occur when two separate ova are fertilized by two separate spermatozoa. The incidence of dizygotic twins is influenced remarkably by race, heredity, maternal age, parity and especially fertility drugs (MacGillivray, 1986).
On the other hand, monozygotic twins result from fertilization of a single ovum that subsequently divides. Depending upon the time interval between fertilization and cleavage of the embryo, different placental membrane relationships may result. Monozygotic twinning seems to occur at a fairly constant ratio throughout the world at between 3-5 per
1000 births (Benirschke, 1990).
Other data
| Title | MULTIPLE PREGNANCY | Other Titles | الحمل المنعدد | Authors | HANAN MOSTAFA RIZK | Issue Date | 1993 |
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