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I am pregnant with MCMA twins. What does reverse A wave mean?

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Patient's Query

Hi doctor,

I am pregnant with MCMA twins. We have been told that one twin has a reversed A wave. What possible outcomes can this have for the twin?

Please explain. Thank you.
Answered by Dr. Megha Tuli

Education:

MD

Professional Bio:

Dr. Megha Tuli is an Obstetrician and Gynecologist specializing in comprehensive women’s healthcare. Her expertise includes prenatal and postnatal care, high-risk pregnancies, gynecological surgeries, fertility management, and preventive women’s health. She is committed to personalized care, patient education, and promoting overall reproductive wellness.

This doctor is not available for online consultations on the platform anymore.

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Hi,

Welcome to icliniq.com.

I read your query and can understand your concern. A reversed A wave in Doppler is associated with very high chance of trisomy in the baby. The genetic abnormalities associated with this maybe even fatal.

Since monochorionic monoamniotic twins (MCMA twin) are usually monozygotic that is they share the same genetic material and hence the other baby may also be affected.

I suggest you to get the other baby tested too. In case the results are normal for the other one, you could try going for selective fetal reduction procedure.

Through this way you could at least have one healthy baby.

Hopefully everything turns out well for you. All the best.

Thank you.

Answered by Dr. Megha Tuli
Medically reviewed by iCliniq medical review team
Published At April 4, 2016
Reviewed At October 8, 2025

Education:

MD

Professional Bio:

Dr. Megha Tuli is an Obstetrician and Gynecologist specializing in comprehensive women’s healthcare. Her expertise includes prenatal and postnatal care, high-risk pregnancies, gynecological surgeries, fertility management, and preventive women’s health. She is committed to personalized care, patient education, and promoting overall reproductive wellness.

This doctor is not available for online consultations on the platform anymore.

Consult other doctors in the same speciality

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Decision Helper
Reversed A Wave in MCMA Twins: Genetic Risk and Management Decision Helper

Navigating a Reversed A Wave in MCMA Twins?

This tool assesses your readiness for discussion about a reversed A wave finding in your monochorionic monoamniotic (MCMA) twin pregnancy and guides you on clinical evaluation and next steps to discuss with your doctor.

This tool provides educational information only and does not diagnose, treat, or replace professional medical advice. Consult a qualified healthcare professional for personalized medical guidance.
Dr. Megha Tuli
Dr. Megha Tuli

Obstetrics and Gynecology

Education:

MD

Professional Bio:

Dr. Megha Tuli is an Obstetrician and Gynecologist specializing in comprehensive women’s healthcare. Her expertise includes prenatal and postnatal care, high-risk pregnancies, gynecological surgeries, fertility management, and preventive women’s health. She is committed to personalized care, patient education, and promoting overall reproductive wellness.

This doctor is not available for online consultations on the platform anymore.

Consult other doctors in the same speciality
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