Texas Children's Fetal Center launches first fetal interventional program in the Southwest to treat HLHS in-utero

"Previously, patients had limited options for their babies when they received an early diagnosis of HLHS during a routine ultrasound," says Dr. Michael Belfort, obstetrician and gynecologist-in-chief at Texas Children's Hospital and chairman of the Department of Obstetrics and Gynecology at Baylor College of Medicine. "From this moment on, through the collaborative work of the Fetal and Heart Centers at Texas Children's Pavilion for Women, we can offer more options to families who otherwise would have little hope."

HLHS is a condition that occurs in approximately 1 in 6,000 live births when the fetus's left side of the heart does not develop normally. Because most of the structures on the left side of the heart are too small and underdeveloped (hypoplastic), it is difficult for the heart to provide enough red blood flow for the body's needs. All children with HLHS will undergo at least three surgeries within the first three years of life. However, if diagnosed early using a fetal ultrasound, some fetuses may be a candidate for the new in-utero catheterization procedure that will help treat HLHS and allow them to be more stable at birth before having to undergo their first heart surgery.

"Thanks to our collaboration with the Fetal Center, our heart program is now so comprehensive that we are in the position to offer care not only to fetuses in-utero but are able to take care of these patients all the way into adulthood. Our expertise ranges across all ages of patients with congenital heart disease," said Daniel J. Penny, chief of cardiology at Texas Children's Hospital and leader of pediatric cardiology at Baylor College of Medicine (BCM).

Texas Children's Fetal Center experts have cared for four fetal intervention patients in the last four months. Each case has varied slightly. The first two Texas Children's patients were taken to Children's Hospital Boston where they were treated in collaboration with the Texas Children's team for critical aortic stenosis or a severely obstructed aortic valve. These types of critical aortic stenosis are typically detected mid gestation and, develop into HLHS at the end of the pregnancy. The left side of the heart stops growing and becomes severely underdeveloped, rendering it inadequate to support the systemic cardiac output.

The third and fourth patients were treated at Texas Children's Hospital. For the most recent two patients, physicians were dealing with a rare type of HLHS where the fetus had an intact atrial septum (IAS), a severe congenital cardiac malformation with little possibility of postnatal survival, even with a cardiac intervention performed immediately after birth.

Each complex fetal intervention involved accessing the fetal heart in-utero via a specialized needle and inflating a balloon catheter into the baby's heart. In the first two cases, the balloon was inflated across the fetus' small aortic valve in order to allow blood to be pumped from the heart to the fetus' body. In the last two procedures, the balloon was inflated across the wall between the top two atrial chambers of the heart. The balloon created a hole to allow the passage of blood from the underdeveloped left atrium into the right atrium - a technique that will increase the chances that the baby will have enough oxygen in its blood to survive after birth. In the fourth procedure, a metal mesh known as a stent was also placed across the wall separating the upper chambers in order to help maintain the opening that was created.

The Texas Children's Fetal Center at the Texas Children's Pavilion for Women is one of only a few centers in the world capable of performing this complex fetal intervention as it involves a coordinated effort among a large, multi-disciplinary team of fetal cardiologists, OBGYNs, interventional cardiologists, congenital heart surgeons, fetal imaging experts, maternal and fetal anesthesiologists and other clinical specialists. Babies receiving this unique fetal procedure at Texas Children's Fetal Center will continue treatment immediately after birth at Texas Children's Heart Center, which is ranked #4 in the nation by U.S. News World Report and consistently reports outcomes that are among the best in the nation.

Following each procedure, maternal fetal physicians monitor the mother and baby through multiple fetal ultrasounds and echocardiograms so that the mother may carry the baby to as close to full term as possible, giving the lungs, brain and other vital organs a chance to mature prior to birth.

With this aggressive plan, the hope is that these fetuses will be able to proceed with lifesaving newborn cardiac surgery, and subsequently they will receive a series of three surgeries. The hope for the fetuses who undergo dilation of the aortic valve is that instead of living with only one functional ventricle, the left ventricle is "rescued" in utero. The goal for these children is that they are born with both the right and the left side of the heart functioning well. For fetuses who undergo opening of the hole between the atrial chambers, the left side of the heart is usually too small to be rescued. These are usually at the highest risk for death shortly after birth. The fetal procedure allows them to be more stable at birth, and to go on to a series of heart surgeries to stabilize the circulation.

The first surgery is a Norwood procedure to reconstruct the heart to allow the right ventricle to become the systemic ventricle and to pump blood to the baby's body and lung. Dr. Charles Fraser, chief of congenital heart surgery and surgeon-in-chief, along with his team of cardiovascular surgeons, have a near 90 percent success rate using the Norwood procedure, which is among the best outcomes in the country.

Texas Children's Maternal and Fetal Center is located in the Pavilion for Women and is one of only a few worldwide to offer a full spectrum of maternal and fetal medicine. Comprehensive services include management of any complex pregnancy, genetic counseling and the full range of fetal diagnostic procedures. The Fetal Center also provides highly specialized fetal surgeries for a number of congenital malformations. Texas Children's Hospital in Houston is among the nation's leaders in providing high-risk maternal care and the diagnosis and treatment of abnormalities in unborn and newborn infants.

Texas Children's Heart Center is a self-contained pediatric heart treatment facility within Texas Children's Hospital. Its unique design provides a single point of care including examinations, echocardiography, heart catheterization, congenital heart surgery and intensive care. This special setting enhances the continuum and delivery of cardiac care from the fetus to the adult. Texas Children's Heart Center sees more than 19,000 patients and performs more than 800 surgeries and performs over 1,000 catheterizations annually.

For more information, please visit http://women.texaschildrens.org/ or http://www.texaschildrens.org/heart/.