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Cardiology, Inside Pediatrics

Xenotransplantation Takes Steps Toward Clinical Trials

Children’s of Alabama cardiothoracic surgeon David Cleveland, MD, MBA, leader of the xenotransplantation program at Children’s of Alabama and the University of Alabama at Birmingham (UAB). 

News that surgeons at the University of Maryland Medical Center had implanted a genetically modified pig’s heart into a human rocked the medical world earlier this year. But it didn’t surprise Children’s of Alabama cardiothoracic surgeon David Cleveland, MD, MBA, who is leading a similar xenotransplantation program at Children’s and the University of Alabama at Birmingham (UAB). 

The program focuses on developing genetically modified solid organs from pig models for transplantation. To date, Cleveland’s team has successfully transplanted a genetically modified pig kidney into a brain-dead patient. The kidney produced urine.

Three years ago, Cleveland presented preliminary results from a study showing little reactivity in an infant’s blood to cells from a triple-knockout (TKO) pig. The pig had been genetically modified to delete the three major antigens that react with natural human anti-pig antibodies. Even those human cells that did react demonstrated a very mild reaction.

Back then, Cleveland said the next step was a transplant in a non-human primate, something required before the FDA would approve human trials. 

Now he’s done it. So far, Cleveland and his team have implanted four infant baboons with the genetically modified pig hearts, with one of the animals living as long as eight months. In humans, the goal isn’t to have the heart last a lifetime but, rather, just long enough for a human heart to become available for transplant. 

“I think we have to consistently demonstrate a four-to-six-month survival in non-human primates before the FDA approves a clinical trial,” Cleveland said. The team plans to implant more animals with the hearts this fall and is working on several grants to continue funding the study. Cleveland hopes to be able to submit the design for a clinical trial to the FDA sometime in 2024. In the meantime, he and his team published the results of the first baboon study in The Annals of Thoracic Surgery.

It’s quite possible, however, that the first transplant might occur outside a clinical trial with a humanitarian device exemption from the FDA. The authorization allows a device—in this case, the pig heart—to be used without showing effectiveness in formal clinical trials. That’s how the patient at the University of Maryland Medical Center was able to receive his heart.

“But our goal, ultimately, is to participate in an NIH-funded clinical trial,” Cleveland said, adding that those trials are conducted in more patients with strict safety monitoring and comprehensive data collection.

Cardiology, Inside Pediatrics

Pea-Sized Device Proves Lifesaving for the Tiniest Babies

Mark Law, MD, and William McMahon, MD, are pediatric cardiologists at Children’s of Alabama.

Imagine a baby who weighs less than two pounds. Now imagine that baby has a life-threatening, congenital heart condition called patent ductus arteriosus (PDA), in which the opening between the two blood vessels leading from the heart hasn’t closed. Now imagine performing open-chest surgery on that tiny neonate. 

“Patent ductus arteriosus is a significant problem for many premature babies,” pediatric cardiologist William S. McMahon, MD, said. Usually, however, it closes on its own. That’s not the case in micropreemies, defined as babies born before the 26th week of pregnancy or weighing less than 28 ounces (700-800 grams). 

PDA affects up to 80% of micropreemies, keeping them on ventilators longer and increasing the risk of lung disease. It can also lead to gastrointestinal problems and affect neurological development. That’s why closing the opening is critical. 

Yet the risks of operating on such a tiny preemie are nearly as great as the risks of PDA, said pediatric cardiologist Mark Law, MD, so few surgeons perform the surgery. 

“It’s a hard decision to make because many babies will survive with the PDA, or it may get smaller,” he said. While there is medication available to treat PDA, it’s often unsuccessful and has its own risk of kidney complications. Still, given the risk of open-chest surgery in such a small baby, “many surgeons would choose to continue to manage the baby medically,” Law said.

That changed in 2019 with the approval of the Amplatzer Piccolo Occluder, a pea-sized device that a cardiologist can snake through the femoral vein and into the heart via a catheter. “With this device, we now have the opportunity to intervene in a minimally invasive fashion with much less insult to the baby and a much lower risk of serious complications and still get the PDA closed,” McMahon said. 

The occluder also allows them to avoid the artery, which they use to close PDAs in full-term or larger premature babies. In such tiny babies, however, putting a catheter through the artery could cause significant damage. “It’s part of the miracle of this device that we don’t have to access the artery,” McMahon said. “It’s much safer going in through the vein.”

Unlike most catheterization procedures, implanting the occlusion device requires a team of specialists, including neonatology, the cardiac catheterization team and anesthesiology, among others. “They’re fragile babies at risk just for the exposure and movement,” Law said. To date, the team has implanted the device in more than 20 babies.

“Not only will the device keep more of these tiny babies alive,” he said, “but, hopefully, it will result in more micropreemies who get to the end of the first year of life with fewer difficulties like chronic lung disease, GI tract disease and neurodevelopmental problems.”

“Any little thing that you can help these babies do better in the first year of life, so they are less dependent on medical technology and even less damaged from the care required to keep them alive,” McMahon said, “ends up in a better baby in the future.”

Cardiology, Inside Pediatrics

Which Device is Most Effective at Treating Cyanotic Congenital Heart Defects?

Mark Law, MD, is a pediatric cardiologist at Children’s of Alabama.

Doctors at Children’s of Alabama are working to answer a question that could help save the lives of infants with cyanotic congenital heart defects. In a new study, they’re asking which device is better: the Blalock-Taussig-Thomas (BTT) shunt or the ductus arteriosus (DA) stent. 

The study is called the COMPASS Trial, short for Comparison of Methods of Pulmonary Blood Flow Augmentation in Neonates: Shunt Versus Stent. Children’s pediatric cardiologist Mark Law, MD, is the leading institutional investigator for Children’s.

“This is a very interesting study for our field,” Law said. “We have very few randomized controlled trials to show us which treatment strategy is best. There’s some thinking that DA stents may require additional, non-emergent interventions after they are implanted, and some data suggests the shunts may require a higher number of emergent interventions early on. We just don’t know.”

Of the two devices, the BTT shunt has been around longer. Developed in the 1950s, the shunt was the subject of a made-for-TV movie called “Something the Lord Made.” At the time, the shunt was lifesaving for babies with Tetralogy of Fallot. Today, it is used to manage babies with various heart defects that result in cyanosis, which causes insufficient blood flow from the heart to the lungs, resulting in low oxygen levels. These infants are often referred to as “blue babies.” 

“It was field-changing when it was developed,” Law said of the shunt. However, it also requires open-chest surgery, which can lead to more complications and a higher risk of death.

DA stents, developed more recently, a much less invasive. A stent can be threaded into the ductus arteriosus, the artery that connects the aorta and pulmonary artery in newborns. Once in place, the stent is expanded to prevent the DA from closing.

Both the BTT shunt and the DA stent provide a stable source of blood flow to the lungs until the baby is large enough for an operation to repair the heart defect. Both options are relatively safe and effective, but both also present the risk of complications and death. 

No one knows which is better because, until now, there’s never been a large study directly comparing the two procedures. The COMPASS Trial is a multi-institutional, NIH-funded study with the Pediatric Heart Network to see if one is safer and more efficacious than the other or if they are equally effective. 

Investigators hope to enroll 300 newborns over the next two years and follow each through the first year of life. Most centers, including Children’s, should start enrolling patients this fall.

Overall survival and post-surgical complications are key endpoints for the study, as well as hospital length of stay and quality of life. Investigators also hope to learn which approach is best based on the child’s anatomy.

“We hope to come out the other end smarter and knowing which is the best therapy,” pediatric cardiologist William McMahon, MD, said. “Because right now, we just don’t know.”

Cardiology, Inside Pediatrics

Harmony Device Saves Children from Open-Heart Surgery

Harmony transcatheter pulmonary valve

In July 2021, interventional cardiologist William McMahon, M.D., Mark Law, M.D., and the Pediatric Cardiac Catheterization Lab team at Children’s of Alabama, snaked a catheter device through a vein in a 16-year-old girl’s leg up to her heart and replaced the valve. She went home the next day with just a small scar on her leg that will eventually become invisible. The U.S. Food and Drug Administration approved the device, called the Harmony transcatheter pulmonary valve, in March. Drs. McMahon and Law were the first cardiology specialists in a 10-state region to use it.

Fewer than 20,000 children are born each year with Tetralogy of Fallot, a condition marked by four major heart defects: ventricular septal defect, or a hole in the two lower chambers of the heart; a narrowing of the pulmonary valve and main pulmonary artery; malaligned aortic valve; and ventricular hypertrophy, or thickening, of the right ventricle. These children often need surgery soon after birth and a pulmonary valve replacement by the time they’re adolescents or young adults.

In the past, that meant another open-heart surgery and time spent on cardiopulmonary bypass, which carries significant risks of complications; a week or more in the hospital; scarring; weeks of recovery at home; and a low but real risk of death. In addition, because the children have already had major heart surgery, scar tissue from the previous procedure makes the valve replacement even more difficult.

In July 2021, however, interventional cardiologist William McMahon, M.D., and his colleague Mark Law, M.D., together with the Pediatric Cardiac Catheterization Lab team at Children’s of Alabama, snaked a catheter device through a vein in a 16-year-old girl’s leg up to her heart and replaced the valve. She went home the next day with just a small scar on her leg that will eventually become invisible.

The U.S. Food and Drug Administration had just approved the device, called the Harmony transcatheter pulmonary valve, in March. Drs. McMahon and Law were the first cardiology specialists in a 10-state region to use it. While similar devices have been available for pulmonary valve replacement, few children with Tetralogy of Fallot qualified because of their previous surgeries. Now, Dr. McMahon estimates that four out of five children with the condition will qualify.

The new procedure is a game-changer, he said. “We have many patients who live in fear of that surgery because they’ve been told they need another open-heart surgery since they were 8 or 10. We certainly have some patients who reasonably don’t want to do it and some who put it off. That becomes a problem because it means their heart is working harder.”

Dr. McMahon says the advantages to the Harmony device are obvious: “There’s a quicker recovery; lower risk of major complications and death; and they’re able to get on with their lives sooner.” The team has completed 10 procedures so far with no complications other than some arrhythmia that resolved with treatment.

Some patients returned to work or school three days after the procedure. And while the valve won’t last forever, Dr. McMahon expects a new valve could be inserted within the old one in the same manner. “That’s the overall goal of these valves,” he said. “To reduce the total number of heart surgeries that our patients need during their lifetime.”

William McMahon, M.D.

William McMahon, M.D., is an interventional cardiologist at Children’s of Alabama and a professor in the Division of Pediatric Cardiology, University of Alabama at Birmingham Department of Pediatrics.

Cardiology, Inside Pediatrics

Improving Quality and Outcomes in Cardiology

Ashley Moellinger, RN, CRNP, Cardiovascular Services, Children's of Alabama

Ashley Moellinger, RN, CRNP, Cardiovascular Services, Children’s of Alabama

Children’s of Alabama is deeply committed to continual improvement in every part of the care pathway. Two quality-improvement projects in cardiology are already showing the results.

Handoff of Care

Medical errors are the third-leading cause of death in the United States.[1] The Joint Commission reports that two-thirds of serious medical errors, or “sentinel events,” are tied to poor communication, and half involve communication during care handoff, such as when a patient is transferred from the intensive care unit (ICU) to surgery or back.[2]

The handoff is an important faultline for miscommunication that can lead to patient harm, said Children’s of Alabama cardiovascular intensivist Hayden Zaccagni, M.D. It’s not just communication between the intensivist and the surgeon; it involves the pediatric anesthesiologist, bedside and surgical nurses, advanced practice practitioners, and respiratory therapists.

“It’s a big team that cares for these patients,” Dr. Zaccagni said. Research shows that standardizing the handoff from the ICU to the operating room increases communication without delaying surgery and increased provider satisfaction and patient readiness for surgery while reducing errors.[3],[4]

The cardiology service didn’t have standardized protocol for handoffs, so Dr. Zaccagni, together with Ashley Moellinger, RN, CRNP, leda quality-improvement (QI) project to develop a process that prioritized clear, concise, and consistent communication from the cardiac ICU to the operating room or catheterization lab.

They started with a survey of 82 staff members, which found that 69 percent had experienced a safety event related to inadequate handoff. The survey also showed that communication was the primary barrier to transition followed by organizational barriers.

The team developed a tool and process for handoffs that involved all clinicians who interacted with the patient. “This multidisciplinary approach is so important,” said Moellinger.

Now, the night prior to surgery, the nurse practitioner, bedside nurse, and respiratory therapist complete a data form on the patient. The next day, the entire team meets at the bedside to review the form and bring up any concerns. “A big part of this is around situational awareness, or concerns we have about the patient that might not be obvious from reading through the chart or notes,” said Moellinger.When the patient is transferred, the team verbally goes through the tool again to ensure there are no outstanding questions or changes in condition.

The team is also tracking what it calls “moments of clarity”—when the process unveiled a potentially problematic issue such as a difficult airway, unavailability of vasoactive drip, patient cardiac arrest the prior night, or airway management for a patient with worsening oxygen levels.

The goal, or “smart aim,” was to demonstrate a standardized handoff in 80 percent of transition interactions, with 80 percent completion of patient data points by December 2021, and 95 percent compliance by July 2022.

Reintervention Reduction

This reintervention reduction QI project focuses on the most complex cardiothoracic surgery performed in newborns. Called the Norwood procedure, the surgery involves constructing a new, larger aorta for babies born with hypoplastic left heart syndrome. Nationally, patients who don’t require an intervention after their surgery have a mortality rate of about 6 percent compared to the 26 percent mortality rate in those who require another surgery or catheterization procedure.

The project, which is part of the National Pediatric Cardiac Quality Improvement Collaborative, was designed to understand why reinterventions occurred and identify opportunities to recognize the warning signs early in the post-operative period.

The Children’s team first performed a root-cause analysis of the 69 patients who required additional interventions between January 2015 and June 2020. That involved identifying what triggered the complication and how it could have been prevented. Of the 69 patients, 23 (34 percent) required an unplanned cardiac surgery or catheterization while hospitalized after the first-stage operation. Half of the surgical interventions were to explore unexplained bleeding, and half of the catheterization interventions were for conduit stenting to improve pulmonary blood flow. Fewer than five patients (12.5 percent) who required a reintervention died compared to none in the other group.

Reviewing the entire care pathway from the cardiovascular ICU to the operating room and back, including rates of post-operative bleeding and the timing for administering blood products, “we were essentially able to come up with a solution that we should communicate more effectively between team members in the operating room,” said Dr. Zaccagni. One way to improve communication is to wait at least 30 minutes in the operating room after closing the sternum to estimate chest tube output. Another is to standardize blood work when a patient is bleeding in case it’s due to a rebound effect of blood thinners given during the surgery. In addition, the team developed a standardized tool for the post-operative debriefing with the entire team.

The efforts are already paying off, said Moellinger, with fewer reinterventions since they began in 2020. “Standardization and, thus, reducing variation in everything we do is an important component for the best outcomes,” she said.


[1] Makary MA, Daniel M. Medical error—the third leading cause of death in the US. BMJ. 2016;353:i2139.

[2] The Joint Commission. Inadequate hand-off communication. Sentinel Event Alert. September 12, 2017. Issue 58.

[3] Caruso TJ, Marquez S, ,Luis J, et al. Standardized ICU to OR handoff increases communication without delaying surgery. Int J Health Care Qual. 2017;30(4):304-311.

[4] Joy BF, Elliott E, Hardy C, Sullivan C, Backer CL, Kane JM. Standardized multidisciplinary protocol improves handover of cardiac surgery patients to the intensive care unit. Pediatr Crit Care Med. 2011 May;12(3):304-8.

Cardiology, Inside Pediatrics, Pulmonology

Saving Children with Pulmonary Hypertension – One Patient at a Time

Bennett_Pearce_MD_600x284

Children’s of Alabama cardiologist Frank Bennett Pearce, M.D.

When the cardiology team at Children’s of Alabama heard the family history of a 6-year-old boy who presented with an episode of syncope, they knew immediately what was wrong. His father had undergone a double lung transplant at the University of Alabama at Birmingham to cure his pulmonary hypertension (PH). Now his son had been diagnosed with the same thing.  

But that wasn’t the only problem. The boy had also developed a supraventricular tachycardia requiring radiofrequency ablation, which was successful. 

“So we cured that,” said Children’s cardiologist Frank Bennett Pearce, M.D., the boy’s cardiologist. But then the patient continued having episodes of syncope, particularly during exertion. “When that happens in patients with PH, it’s because the blood can’t get through the lungs to the left side of the heart, limiting cardiac output,” said Dr. Pearce. To address that problem, Dr. Pearce and his team performed an atrial septostomy, creating a tiny hole between the atria in the atrial septum. Second problem fixed. 

Discharged on oral medications, the child did well with close follow up for several years, said Dr. Pearce, although he was vulnerable to pneumonia and other infections.  

Then in 2020, at age 13, he took a turn for the worse. “There are three principal metabolic pathways involved in treatment of PH,” said Dr. Pearce. Two—endothelin and phosphodiesterase—have effective oral drugs for treatment. The third, the prostaglandin pathway, is more difficult to address, he said. In the past, it required a central line for IV infusions of treprostinil, a prostaglandin pathway medication. “Most families are very reluctant to go to the central line because it creates major problems in their lifestyle and is a quantum leap in terms of the negative effects on these children,” he said. 

However, treprostinil can also be administered subcutaneously through a small catheter and external pump, much like an insulin pump. Unfortunately, the day the teen was scheduled for cardiac cath and initiation of subcutaneous treprostinil, he became very cyanotic. “We didn’t think it was safe,” Dr. Pearce said. Instead, the boy was admitted to the CVICU on inhaled and oral prostacyclin inhibitors. Despite increasing the dosage, his disease progressed. Finally, the team put him on the intravenous form of treprostinil, and he improved. Eventually, they were able to transition him to the subcutaneous form of the drug via the pump, and he became the first patient at Children’s to be initiated onto subcutaneous treprostinil. 

He’s now home and undergoing evaluation for a lung transplant. “He’s a typical teenage kid but able to deal with all these challenges and keep a pretty good attitude, thanks to support from his family,” said Dr. Pearce. “He just hangs in there.” 

Cardiology, Inside Pediatrics

T3: Clinical Decision Support Platform in the CVICU Improves Monitoring; Reduces Problems

Doctors-Cardiovascular-ICU-Monitoring-Etiometry-Resized

Right, Santiago Borasino, M.D., and left, Hayden J. Zaccagni, M.D.

An enduring issue in pediatrics is that so much of the technology used was developed for adults and must be retrofitted for children. That’s why the new software the cardiovascular ICU (CVICU) at Children’s of Alabama received for its monitoring devices is such a big deal. “It’s unique to the pediatric cardiovascular ICU population because it was developed initially for that population,” said cardiac intensivist Hayden J. Zaccagni, M.D.  

The software, called T3 (trajectory, target and trigger), was developed by ICU software development company Etiometry with input from some of the top children’s hospitals in the country. Dr. Zaccagni calls it a “situational awareness tool,” one that pulls information from the telemetry unit, ventilator and other machines and displays all the data on one screen. It also provides past data and trends and uses algorithms to warn staff of the probability of low oxygen levels in the venous blood (a surrogate of a lower-functioning cardiac pump). 

With 20 beds in the CVICU that are nearly always filled, anything that makes it easier for the team to track potential problems and potentially improve outcomes is a boon. 

The software’s greatest value comes from the historical information it provides, said Dr. Zaccagni. Physicians and nurses can then use objective data to review events and improve their knowledge about what happened and why, he said. For instance, they use the data during extensive reviews of all cardiac arrest occurrences. “It shows the baseline, what happened before the arrest and what happened that led to the physiology failure,” he said. And that can identify opportunities for improvement. 

“It provides two things we didn’t have before,” said cardiac intensivist Santiago Borasino, M.D. “The ability to see multiple vital signs trend at the same time on the same screen and the ability to see trends over time right at the bedside without running a report on a different computer.” 

“Sometimes the vital signs might look normal, but that might be very abnormal compared to what the patient was experiencing six hours ago,” Dr. Borasino said.  

It also improves rounding communication and efficiency, enabling the entire team, including the attending physician, fellow, bedside nurse, dietician, respiratory therapist and pharmacist, to view the patient’s history for the past 12-24 hours at the same time. “We want everyone on the same page,” Dr. Zaccagni said. “The goal is that everyone is aware of patients at risk for having an untoward event.” 

The other advantage is the software’s ability to continually recalculate the algorithm based on the changes in vital signs. “As intensivists, we’ve been trained to put together information from different sources to create a picture of whether the patient is fine or not fine,” Dr. Borasino said. But those mental algorithms are fraught by memory and sometimes wrong. The software, however, provides robust data analyses and assigns a probability of a problem. 

“The ability to view the history, see multiple vital signs at the same time and see data trends, I think, provides better monitoring and helps us find problems when they’re small rather than when they’re big,” said Dr. Borasino. “Everyone knows when the patient is crashing; the algorithm and the way the information is laid out in front of us might help us act before the patient is crashing.” 

Cardiology, Inside Pediatrics

Comparing Delayed Sternal Closure Results Reinforces Success at Children’s of Alabama

Leaving the chest open for a day or two after complex neonatal heart surgery has been standard procedure at Children’s of Alabama for about a dozen years. The practice is believed to be a “safety mechanism” that lessens compression on the heart and lungs as swollen babies begin to recover from their operations, according to Robert Dabal, M.D., chief of pediatric cardiothoracic surgery at Children’s and an associate professor of surgery at the University of Alabama at Birmingham (UAB).

But does the approach, known as delayed sternal closure, actually produce better outcomes than closing a newborn’s chest at the conclusion of surgery? The Pediatric Cardiac Critical Care Consortium (PC4) recently invited Children’s and University of Michigan’s C.S. Mott Children’s Hospital to debate the question by comparing each hospital’s outcomes. Unlike standard practice at Children’s, C.S. Mott cardiothoracic surgeons “tend to close a lot of complex neonates,” Dabal explained.

Children’s has been a member of PC4 – which aims to improve the quality of care to patients in North America and beyond with critical pediatric and congenital cardiovascular disease – since the group’s inception about 12 years ago. The head-to-head comparison of outcomes between Children’s and C.S. Mott showed survival rates to be higher at Children’s, though the gap was not statistically significant, Dabal said.

“We found that delayed sternal closure doesn’t really negatively impact patients in any way, either in length of stay or rate of complications, but it does make them a little easier to manage in the immediate postoperative period,” he said.

Mortality rates at Children’s for complex neonatal heart surgeries are consistently far lower than the U.S. average, he noted. For example, for the Norwood procedure – a three-step heart surgery for hypoplastic left heart syndrome – Children’s mortality rate has been about 5.5% over the last five years, compared with a national average of about 15%.

Possible complications from leaving the chest open after surgery include slightly higher odds of infection, “though we haven’t really seen that here,” Dabal said. The practice also requires greater sedation to prevent patients from “moving around a lot” in the days after surgery and a slight delay in removing ventilators.

But the PC4 debate results essentially reinforce Children’s approach, and Dabal expects delayed sternal closure to continue here as the standard of care. “I don’t think we’ll be making major changes, though we’re always interested in continuing to improve our results,” he said.

Cardiology, Inside Pediatrics

Using Stem Cells to Strengthen the Hearts of HLHS Patients

While advanced surgical techniques, ICU care and outpatient management have dramatically improved survival rates for children born with hypoplastic left heart syndrome (HLHS), additional treatment options are still very much needed. That’s why pediatric cardiologists at Children’s of Alabama are eager to join forces with the Mayo Clinic to test stem cell therapy on HLHS patients from Alabama and the surrounding region.

A year after joining the Mayo Clinic’s HLHS Consortium – about a dozen prominent children’s institutions spread across the United States and Canada – Children’s is taking part in clinical research to determine if stem cells from a patient’s own umbilical cord blood can strengthen the right side of the heart.

Born with an array of underdeveloped structures on the left side of their hearts, HLHS patients typically undergo three surgeries over their first four years of life. Children’s treats between 12 and 20 such patients every year.

“This was a uniformly fatal diagnosis before these operations were used,” said Waldemar Carlo, M.D., an associate professor of pediatrics in the Division of Pediatric Cardiology at Children’s and the University of Alabama at Birmingham (UAB). “Outcomes are ever-improving for this diagnosis, and we’ve gotten the first-year mortality down to under 10%. But we know that the decreasing function of the right ventricle over time limits how long these patients can live.”

The Phase 2 clinical trial, in which Children’s is completing enrollment, is based on successful Phase 1 results and will further determine the safety and efficacy using cell-based regenerative therapy to help manage HLHS. Parents expecting babies known to have HLHS are approached before childbirth and offered the opportunity to bank their baby’s umbilical cord blood. Stem cells derived from that blood are then injected directly into the infant’s right ventricular muscle during second-stage (Glenn) surgery.

To compare outcomes over time, the trial will also include a placebo arm of patients who do not receive stem cells during second-stage surgery. Several HLHS patients at Children’s will be included in each arm.

“The thought with this therapy is that stem cells would initiate a response in the right ventricle to strengthen the heart muscle over time – hopefully preserving its function longer than would otherwise happen,” Carlo said.

“We were chosen because we have very good clinical results in the care of children with HLHS at Children’s of Alabama,” Carlo added. “That is a prerequisite before participating in clinical research using novel therapies. It’s certainly an honor to participate with these other excellent centers.”

Cardiology, Inside Pediatrics

Planning Complex Heart Surgeries Made Easier with 3D Models

Viewing the heart up close in all its complexity was once only possible during surgery. But specialists at Children’s of Alabama are increasingly tapping the ability to create 3D heart models that help them to better plan intricate surgeries before they take place.

With 3D printing technology becoming far less expensive since its creation about a decade ago, Children’s has been printing hearts for about two years. The arrival of Christian Tan, M.D., a PGY-5 pediatric cardiology fellow at University of Alabama at Birmingham (UAB), has prompted an uptick in its use as he collaborates with specialists in Radiology and Imaging, which operates Children’s 3D printer.

“This provides an additional way for us as providers to assess and look at the anatomy of the heart,” Tan explained. “It gives you different insight when you’re actually able to hold and look at a model and see it from many different perspectives. We can do some of that with digital 3D constructions from CT scans, but it’s different when you can manipulate the heart with your hands and see it from any vantage point.”

Using various materials, including a harder, plastic resin and a softer, rubber-like substance, Children’s 3D printer produces models that realistically portray the heart itself along with outside structures such as the aortic arch and pulmonary arteries, Tan said.

The printer cost several thousand dollars, but 3D heart models cost around $12 apiece to produce, he noted. For a recent surgery on a newborn, the 3D model helped cardiac surgeons determine which pathway from the left ventricle to the great arteries would work best for the repair needed. Specialists at Children’s perform about 450 such surgeries each year on patients born with congenital heart defects.

“It helps the surgeon with some mental planning for the surgery, and it helps the cardiologist understand the anatomy better so when it’s explained to the surgeon, the findings are clearer,” Tan said.

Parents also appreciate the ability to “see” their children’s hearts, he added.

“This also helps us explain the anatomy to parents, especially those with no medical background,” Tan said. “It can be hard to understand the difficult problems these kids have.”

“I think it’s very meaningful to the parents,” he added. “In addition to being an educational tool, parents find it a way to connect to their children when they can see their kid’s heart.”