Three Strikes, Three Procedures Save Girl with Half a Heart
February 12, 2009
Two-week old Mira Larrison is going home to Mio, Michigan this week after undergoing a series of procedures to treat her hypoplastic
left heart syndrome (HLHS). The procedures were performed while Mira was in utero as well as immediately following her birth.
One in 100 children born in the United States has a heart defect, and the
U-M Congenital Heart Center is a Center of Excellence for treating one
of the most complex ones, hypoplastic left heart syndrome.
The condition is often described as being born with half a heart because the left ventricle is underdeveloped. Traditional surgery
was too risky for Mira who had other health challenges. Instead U-M used a combination of a fetal intervention, followed by hybrid procedures,
which are less invasive than open heart surgery, to treat the heart defect.
U-M is one of the first hospitals in the country to use the combination to care for such a high-risk patient.
"Additional surgeries are in Mira's future, but she's passed incredible milestones," says
Aimee K. Armstrong, M.D., an
interventional cardiologist and Assistant Professor in the Department of Pediatrics and Communicable Diseases at the U-M Medical School.
What is hypoplastic left heart syndrome?
Mira's parents Katie and Jeremy Larrison knew their second child would face challenges at birth. An ultrasound at 18 weeks showed the poor
heart function and underdevelopment characteristic of HLHS.
Babies with HLHS cannot pump enough oxygen-rich blood to meet the body's needs. Without treatment, 95 percent of babies die within one month.
It is treated either by a heart transplant or a series of three heart surgeries, beginning at birth with what's called the Norwood procedure.
The surgeries are required to allow the right side of the heart to do the work of both sides of the heart.
Ironically, Mira lacked a critical hole in her heart. Without this hole to relieve pressure on the left side of her heart, she would have been
gravely ill at birth and potentially not survive to undergo further treatment.
She also has a genetic abnormality called Turner Syndrome, which places her at very high risk for traditional surgical approaches to HLHS.
Norwood is a complex open heart surgery for any baby with HLHS, but especially so for Mira because she lacked the critical hole in her heart
and was diagnosed with Turner.
The newborn had three strikes against her, and doctors began treating her in the womb.
How U-M Treated Mira
First, using a needle inserted through the mother's abdomen and into Mira's heart, doctors used a balloon to create a much needed hole.
The successful intervention on Dec. 2 allowed Mira to be stable at birth.
Next, physicians had to address HLHS, but the traditional series of surgeries was too risky for Mira. An emerging alternative to Norwood is
a hybrid approach. In hybrid procedures, interventional cardiologists and cardiac surgeons work side-by-side to treat patients without using
a heart bypass machine.
A cardiac team, led by Armstrong and Jennifer C. Hirsch-Romano, M.D., a U-M
pediatric cardiac surgeon, performed two hybrid procedures on Mira Jan. 27, the day she was born, and another on Jan. 29.
Mira was taken from the delivery room to a cardiac catheterization laboratory. The team placed bands on the pulmonary arteries to direct more
blood flow to the body, and placed a stent between the top chambers of the heart to further improve blood flow. Once she stabilized, the same
team inserted additional stents to ensure blood flow to her body. Mira will need more surgeries at 4 months old, and age 2, to further correct
blood flow to her lungs.
University of Michigan Congenital Heart Center is a world leader is caring for children with HLHS. Center director Edward Bove, M.D., and the pediatric
cardiac surgical team have revolutionized surgical approaches to HLHS.
The Center performs more than 850 cardiac operations a year.
Shantell M. Kirkendoll
Portions: Michigan MultiMedia
To Learn More:
What is hypoplastic left heart syndrome?
University of Michigan Congenital Heart Center
University of Michigan Cardiovascular Center
American Heart Association