Twin to Twin Transfusion Syndrome Foundation Banner
International Office
411 Longbeach Parkway
Bay Village, Ohio 44140 USA
Medical Professionals Photo

Creating a Medical Plan of Action A Monochorionic Placenta What is Twin to Twin Transfusion Syndrome Monochorionic Placental Pictures Sonography and Appointment Questionaire Cervical Assessment, Nutrition and Bedrest Planning for Your Delivery When Pregnancy Continues with a Loss Medical Research and Articles History of Twin to Twin Transfusion Syndrome Placental Protocol Professional Letters of Support Quotes from Parents About Their Doctors International Registry

The Monochorionic Twin Placenta

The type of placenta nurturing identical twins plays a significant role in the development of complications in multiple gestation. Identical twins may either have their own separate placentas or they may share a common placenta. The impetus for and the timing of the embryo to split into identical twins is unknown, but the later this occurs the more complications are seen.

The type of placenta is determined by when, in days, the embryo randomly splits into twins following the fertilization of the egg (conception). Twinning within the first four days results in dichorionic or separate placentas similar to those found in fraternal twins (see Figure 1). These identical twins have the lowest complication rates. Twinning four or more days after conception will lead to a shared or monochorionic (MC) placenta. Between four to eight days the MC twins will have separate sacs of water (diamnionic) despite a shared placenta, but after eight days they will also be in the same sac (monoamnionic). Diamnionic monochorionic (4 to 8 day split) twins are the most common placental type for identical twins, and most cases of TTTS occur in this group. It is important to note that if the twins have a MC placenta it is absolute proof that they are 'identical'.

The MC placenta contains two anatomic variables that are thought to develop randomly, which will contribute to and explain why, when and to what degree TTTS will affect the twins. The first is the presence of blood vessels in the placenta that connect the umbilical cords and circulations of the twins, and the second is the variations in the way the twins share their common placenta. These are discussed separately below, but in some MC twins both these abnormalities may be present.

The TTTS Foundation In The News

Raise Donations on Facebook

This is a fantastic and easy way to support the fight against TTTS and bring help and hope to families
>


>

Learn about TAPS- MUST do MCA dopplers on all pregnancies

A form of TTTS, TAPS can occur after laser surgery or during a monochorionic pregnancy with no signs of TTTS or problems.
>

Updated List of Questions

Questions to Ask at Every Ultrasound. Ultrasounds Must Be Weekly Starting at 16 Weeks.
>
World Awareness Day - Dec. 7 2010

TTTS Walk for the babies

Official TTTS Foundation Events
Copyright © 1997-2019 The Twin To Twin Transfusion Syndrome Foundation. All Rights Reserved
411 Longbeach Parkway, Bay Village, Ohio 44140 USA | 800-815-9211 |