Acardiac Twin: Causes, Diagnosis & Treatment

Written by Medicover Team and Medically Reviewed by Dr Vineela Medapati , Gynecologists

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1. Causes 2. Find a Doctor 3. Diagnosis 4. Treatment 5. FAQs

Acardiac twin, also known as twin reversed arterial perfusion (TRAP) sequence, is a rare condition that occurs in monochorionic twin pregnancies. In this condition, one twin does not develop a functional heart and instead relies on the other twin for blood supply. This can lead to serious complications for both twins, impacting their overall health and development. The acardiac twin's abnormal development can put a strain on the healthy twin's cardiovascular system and overall well-being.

What Are the Types of an Acardiac Twin?

Acardiac twinning can manifest in various forms, each presenting distinct challenges and considerations in medical management.

Acardiac Acephalic Twin: This type involves the development of a twin without a head or heart, often relying on the healthy twin's blood supply.
Acardiac Amorphous Twin: Characterised by a mass of tissue lacking defined structures, this type of acardiac twin typically forms alongside a healthy twin in the womb.
Acardiac Parasitic Twin: In this type, the acardiac twin is dependent on the cardiovascular system of the healthy twin for survival, leading to abnormal development.
Acardiac Cephalothoracopagus Twin: This rare type involves the acardiac twin being connected to the healthy twin at the head and chest, sharing blood circulation.
Acardiac Cephalopagus Twin: This type features an acardiac twin attached to the head of the healthy twin, often resulting in severe complications due to the shared blood supply.

What Are the Symptoms of an Acardiac Twin?

Acardiac twin syndrome involves specific symptoms related to the abnormal development of a twin in a pregnancy.

Absence of normal cardiac structures
Presence of a rudimentary heart or minimal cardiac tissue
Lack of normal blood flow to the acardiac twin
Abnormal development of the acardiac twin's body parts
Overgrowth of the acardiac twin's tissues

What Are the Causes of an Acardiac Twin?

Acardiac twinning, a rare complication of monochorionic twin pregnancies, occurs when one twin's heart fails to develop properly due to abnormal blood flow from the shared placenta.

Twin Reversed Arterial Perfusion (TRAP) Sequence
Placental Vascular Anastomoses
Genetic Factors
Environmental Factors

When to See a Doctor for Acardiac Twin?

An acardiac twin is a rare complication of twin pregnancies that requires close medical supervision throughout pregnancy.

Early confirmation of twin pregnancy with abnormal ultrasound findings
Detection of one twin without a visible heartbeat or poorly developed structures
Rapid growth of the healthy (pump) twin or signs of fetal strain
Excess amniotic fluid (polyhydramnios) in the pregnancy
Abnormal blood flow patterns detected on Doppler ultrasound
Diagnosis of twin reversed arterial perfusion (TRAP) sequence

Immediate and regular consultation with an obstetric specialist is essential to monitor the pregnancy, reduce risks, and improve outcomes for the healthy twin.

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How is Acardiac Twin Diagnosis Performed?

Acardiac twin is typically diagnosed during routine prenatal ultrasound scans.

Ultrasound
Doppler ultrasound
MRI
Blood tests
Genetic testing

What is the Treatment for an Acardiac Twin?

Acardiac twin is generally treated by closely monitoring the pregnancy and considering various management options.

Radiofrequency Ablation: This minimally invasive procedure involves using heat energy to stop blood flow to the acardiac twin, preventing further growth.
Laser Ablation: Laser energy is directed to the blood vessels supplying the acardiac twin to seal them off and halt its development.
Umbilical Cord Occlusion: By blocking blood flow through the shared placental circulation, the growth of the acardiac twin can be restricted.
Selective Fetoscopic Photocoagulation: This technique involves using a laser to target and close off blood vessels feeding the acardiac twin, reducing its blood supply.
Serial Amnioreduction: This procedure involves draining excess amniotic fluid to alleviate pressure on the normal twin and help manage complications associated with the acardiac twin.

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What Are the Risk Factors of an Acardiac Twin?

Acardiac twin, also known as twin-reversed arterial perfusion (TRAP) sequence, is a rare condition that occurs during monochorionic twin pregnancies and is associated with risk factors such as advanced maternal age, smoking during pregnancy, and certain genetic factors.

Maternal age over 30
Previous pregnancies
Assisted reproductive technology
In vitro fertilization
History of twin pregnancies

Frequently Asked Questions

1. What is an acardiac twin?

An acardiac twin is a rare condition in which a twin fetus lacks a heart and other vital structures, receiving blood supply from the healthy twin.

2. What causes an acardiac twin?

The exact cause of an acardiac twin is not fully understood, but it is thought to result from abnormal blood vessel connections in the placenta.

3. How is an acardiac twin diagnosed?

An acardiac twin can be diagnosed through ultrasound imaging during pregnancy, typically revealing the absence of a heart and other abnormalities in the affected twin.

4. What are the risks associated with an acardiac twin?

Risks include complications such as heart failure in the healthy twin due to increased blood supply demand, preterm birth, and potential maternal health concerns.

5. How is an acardiac twin managed?

Management may involve close monitoring of the pregnancy, potential fetal interventions, and delivery planning to optimize outcomes for both twins and the mother.