Heterotaxy syndrome is a rare, complex condition a child can be born with that involves certain organs and structures, including the heart, having formed on the wrong side of the body, or being arranged in patterns that are atypical.
As a parent, learning that your child has been diagnosed with this condition can be overwhelming. But improved surgical techniques and expertise have raised survival rates for all patients with heterotaxy syndrome.
In heterotaxy syndrome, the organs in the chest and abdomen are arranged in patterns that are different than normal. Multiple defects can develop, such as:
Even within individual organs things may not be where they should be.
Isomerism (mirroring or dual structures) is common in heterotaxy syndrome.
In normal human anatomy, the left side of the body and the right side of the body are not exactly the same, and the left and right side of two-part organs (such as the lungs) are not identical.
In heterotaxy syndrome, one side of a dual organ is abnormally mirrored or duplicated on the other side (isomerism).
In the lungs, for example, the left lobe of the lung might duplicate itself, replacing what ordinarily should be the right lobe of the lung. So, the entire lung structure is made up of two identical left lobes rather than one right and one left lobe.
There are two basic types of heterotaxy disorder and each causes specific heart defects or abnormalities:
Heterotaxy affects the heart in many different ways.
Heterotaxy syndrome develops before birth. It occurs in about one in 10,000 births and more boys than girls develop the condition.
As is the case with many congenital conditions, the exact cause of heterotaxy syndrome is unknown, but some suspected causes include:
In right atrial isomerism, symptoms usually develop soon after birth and include:
In contrast, infants with left atrial isomerism might not develop any symptoms until years later. In some cases, problems involving other organs such as the liver or spleen lead to the diagnosis.
Because of the multiple abnormal structures associated with heterotaxy syndrome, many cases can be detected before birth. Children’s Health will create a personalized care plan for your newborn.
Our echocardiography lab received accreditation from the Intersocietal Commission for the Accreditation of Echocardiographic Laboratories, which means it meets or exceeds the standard of excellence for pediatric echocardiographic studies. Ours is one of only 27 labs in the country that is certified for fetal studies.
After the birth of the infant, doctors perform different tests to further define the specific sub-type of the disorder in question and the extent of involvement of different organs.
Some tests such as X-rays are noninvasive, while others involve more complicated procedures.
All infants with right atrial isomerism will need multiple major heart surgeries, done in consultation with experts from other fields (renal and hepatic, for example).
All patients need continued, life-long care by cardiologists and specialists from other fields.