Skip to main content Accessibility help
×
Hostname: page-component-7b7567c8c-2n9c9 Total loading time: 0 Render date: 2026-11-15T21:42:24.722Z Has data issue: false hasContentIssue false

Chapter 11.1 - Twin-to-twin transfusion syndrome

Scientific basis

from Section 2 - Fetal disease

Published online by Cambridge University Press:  05 February 2013

Mark D. Kilby
Affiliation:
Department of Fetal Medicine, University of Birmingham
Anthony Johnson
Affiliation:
Baylor College of Medicine, Texas
Dick Oepkes
Affiliation:
Department of Obstetrics, Leiden University Medical Center
Get access

Summary

Introduction

Twin-to-twin transfusion syndrome (TTTS) may complicate multiple pregnancies where there is vascular conjoining within the hemochorial placenta, most commonly in monochorionic twins. The disease has fascinated obstetric specialists since it was first described in 1875 [1] when it was recognized as a condition not amenable to treatment and with very high perinatal loss rates. Since that time, this condition has offered many academic challenges. This is not only in terms of understanding the underlying pathophysiology but also a clinical challenge, in attempting to alter the clinical course of a condition that affects 10–15% of monochorionic twins. This is with a “backdrop” of a condition whose natural outcome would be at least 90% perinatal loss rates and very high (>50%) neuromorbidity in any surviving babies [2, 3].

TTTS is a relatively unusual condition as genetically concordant (i.e., monozygous) twins develop phenotypically discordant features as a consequence of monochorionic placentation and the conjoined angioarchitecture (see Chapter 11.2). In monozygous twins, placentation is dependent on the timing of the zygote splitting, post-fertilization of a single ovum and sperm. If this occurs after 72 hours, then a single placental disk develops, most commonly with two amnions. The “splitting” of the single cellular mass forms the most well-developed hypothesis in the formation of monozygous twins but a “co-dominant axis theory” (with the development of more than a single organizing axis) also exists. Whatever the mechanism, it is in these monochorionic diamniotic (MCDA) twins that TTTS commonly develops, complicating 20% overall and 10% severely (the clinical features of which are usually apparent by the mid-trimester) [3]. However, more rarely, this complication may occur in monochorionic, monoamniotic twin pregnancies when splitting of a single cellular mass occurs (days post-fertilization) (Figure 11.1.1).

Information

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Book purchase

Temporarily unavailable

Save book to Kindle

To save this book to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about saving to your Kindle.

Note you can select to save to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

Find out more about the Kindle Personal Document Service.

Available formats
×

Save book to Dropbox

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Dropbox.

Available formats
×

Save book to Google Drive

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.

Available formats
×