28.02.2013 Views

The Principles of Clinical Cytogenetics - Extra Materials - Springer

The Principles of Clinical Cytogenetics - Extra Materials - Springer

The Principles of Clinical Cytogenetics - Extra Materials - Springer

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

284 Linda Marie Randolph<br />

Fig. 1. Illustration <strong>of</strong> transcervical and transabdominal CVS. Upper: Transcervical CVS. A flexible catheter<br />

is introduced into the chorionic villi, or future placenta. Lower: transabdominal CVS. A spinal needle is inserted<br />

through the abdominal wall for sampling. (From ref. 281, reprinted with permission.)<br />

figures, although small, were similar to the 2% incidence <strong>of</strong> this phenomenon as previously reported<br />

(111). Since then, others have found CPM to occur in 0.8–2% <strong>of</strong> viable pregnancies studied by CVS<br />

at 9–11 weeks’ gestation (112–119) and in 0.1% or less in amniocentesis specimens (75,114).<br />

<strong>The</strong> outcomes <strong>of</strong> pregnancies in which CPM is diagnosed vary from apparently normal outcomes<br />

to severe intrauterine growth restriction (IUGR), although few follow-up reports are yet available in<br />

the literature. Kalousek et al. (120) found 6 cases <strong>of</strong> IUGR among 17 gestations with CVS-detected<br />

CPM, 5 in liveborns and 1 associated with intrauterine death. <strong>The</strong>y noted that others had found a 22%

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!