Browsing Tag

pulmonary hypertension

Cardiology

Building a Team Around Pulmonary Hypertension

The Children’s PH team (L to R): Ahmad Khalil, Frank Bennett Pearce, Jodie Kanaday, Kevin Wall and Matthew Clark.

Pulmonary hypertension (PH) is a heterogenous condition stemming from numerous underlying causes, including extreme prematurity, congenital heart disease and systemic diseases like lupus. It causes dangerous increases in blood pressure in the lungs, straining the heart’s pumping ability and potentially leading to heart failure.

Care for children with PH has typically existed across silos: cardiology, pulmonology, neonatology and intensive care, said Frank Bennett Pearce, M.D., a pediatric cardiologist at Children’s of Alabama. Each discipline did its part. But clinicians increasingly recognized that the complexity of the condition and the fragility of the patients required greater coordination.

Today, a formal PH team of Pearce, pediatric cardiac critical care specialists Ahmad Khalil, M.D., and Matthew Clark, M.D., and pediatric cardiology fellow Kevin Wall, M.D., together with pediatric cardiology nurse specialist Jodie Kanaday, RN, round weekly on patients with PH to determine the best course of action for this rare but complex condition.

“We wanted to improve communication by having us all together saying the same thing to the consultant teams and to the families,” Pearce said.

That consistency matters, especially when care unfolds over weeks or months.

From a cardiology standpoint, PH has always been part of the landscape, Pearce said. “A lot of the treatment and diagnostic procedures like catheterizations and echocardiograms come through cardiology anyway,” he said. “So we end up being the treating doctors in lots of cases, or at least consultants.”

At the same time, many of the sickest patients are in neonatal and pediatric intensive care units and managed by critical care specialists.

PH is typically treated with medications like pulmonary vasodilators regardless of cause, but timing and diagnosis matter. That’s why it’s so important to have a precise anatomic diagnosis before starting medication, Pearce said. In babies with bronchopulmonary dysplasia, for instance, PH may be driven by acquired pulmonary vein stenosis—a condition that requires catheter-based or surgical intervention before medication.

Previously, decisions like these might have been made in parallel by different services. Now, they are made together.  

The team manages about a dozen inpatient pulmonary hypertension cases each month on inpatients at Children’s and the University of Alabama Birmingham (UAB). But inpatient care is only part of the story.

PH does not end at discharge. Medication management, insurance approvals, symptom monitoring and urgent questions follow families home. That’s where Kanaday, who is the Pulmonary Hypertension Clinic care coordinator, shines.

“We literally couldn’t do it without her,” Pearce said. She allows the team to see more patients, stay more organized and keep up with the paperwork/regulatory side of things in the PH world, he said.

Kanaday sees herself as a conduit to the physician. “Our patients know they can contact me directly for questions about medications, symptoms or side effects. I’m able to pass those concerns along quickly, which usually means they get help faster than they otherwise would.”

Her role, she said, is “making sure the doctors have all the information that they need to best take care of the patients.”

While the team is not formally tracking outcomes yet, Pearce says he’s seen a difference. “The patients are staying on their medications more consistently. The doses are more consistent. Some of these medications require a lot of paperwork—that’s getting handled quicker.”

In addition, the improved coordination means patients get to the cath lab sooner for pulmonary vein interventions. The team is also closely tied to newer catheter-based procedures, such as closing a patent ductus arteriosus or atrial septal defects in extremely small infants.

“I think it’s really been an asset to our cardiology team in general, taking this burden off of the general cardiologists and putting these patients with a provider who readily understands the disease process, available treatment options and possible complications. I think it makes our consult service much more efficient,” Kanaday said. “It has really made an impact on the patients, their continuity of care as an inpatient, and their follow-up in the outpatient clinic. I feel like we’re really making a difference and giving these kids the best chance to have positive outcomes long term.”

Neonatology

Risk factors for BPD-PH in preterm infants

Studies led by Children’s neonatologists show early indicators of bronchopulmonary dysplasia with pulmonary hypertension.

It’s well-known that preterm infants are prone to breathing difficulties due to their underdeveloped lungs. But the most common lung disease in these babies, bronchopulmonary dysplasia (BPD), is only recently becoming better understood more than a half-century after it was first described.

Now, Children’s of Alabama neonatologist Samuel Gentle, M.D. is expanding that knowledge by focusing on the most severe type of BPD—the form associated with pulmonary hypertension (PH)—in research that teases out contributing factors to this deadly disease.

It’s a major threat: nearly half of preterm infants develop BPD, which can lead to long-term breathing and health problems. About 20% of these babies also develop PH, and an estimated 40% of them will die of BPD-PH before turning 2 years old.

Samuel Gentle, M.D.

“This is a disease for which there’s growing research interest. It can be lethal, is not uncommon in extremely preterm infants, and we have little understanding of how to prevent or treat it,” said Gentle, who’s also an assistant professor of neonatology at the University of Alabama at Birmingham (UAB). “And children who do survive have long-term complications that persist into adulthood. It’s not a disease they just grow out of.”

“I’ve also had many interactions with families who lost a child to this,” he added. “Oftentimes, a child will be stable and doing well, and then collapse. I’ve seen how this can ravage a family.”

Since research has been scant about what causes the development of BPD-PH—as well as how to screen, treat and prevent it—Gentle wanted to fill the vacuum. Currently, a single ultrasound of the heart is the standard diagnostic method, though UAB performs this testing more frequently.

“We need to get better at identifying this disease in real time, rather than doing ultrasounds at arbitrary time intervals,” Gentle said. “Even with UAB’s testing approach, I believe it will become possible to diagnose it sooner, allowing earlier initiation of PH-targeted therapies.”

Along with UAB colleagues, Gentle published two studies that assessed factors that may contribute to BPD-PH in preterm babies. Published in the American Journal of Respiratory and Critical Care Medicine, they found two important associations: The duration of intermittent hypoxia events and the presence and persistence of a patent ductus arteriosus (PDA) after birth are both novel risk factors for BPD-PH.

In the first study, Gentle found that infants who experienced intermittent hypoxia events lasting longer than one minute were twice as likely to develop BPD-PH. “If an infant has longer intermittent hypoxia events, we might be more proactive in screening that infant for BPD-PH,” he said.

In the second study, preterm babies born with BPD-PH between 22 and 28 weeks’ gestation were more likely to have a PDA vessel that stayed open longer than 28 days. Babies with longer PDA duration were also more likely to die due to complications of BPD-PH than infants with only BPD. “The PDA could be interfering with the development of pulmonary vasculature resulting in PH,” Gentle said.

UAB will be participating a multicenter trial to determine whether closing PDAs with a catheter-closure device might lower the risk of this PH variant. But far more study is needed, Gentle pointed out.

“While this research focused on a specific phenotype of BPD, we need a comprehensive approach to identifying each infant’s specific type of lung disease from which we can decide on the best therapeutic course for every child,” he said.