Browsing Tag

sickle cell disease

Inside Pediatrics, Pulmonology

Solving the Mystery of Lung Disease in Children with Sickle Cell Disease


Children’s of Alabama pulmonologist Ammar Alishlash, M.D.

If lung disease is the leading cause of death in children with sickle cell disease, then why aren’t pulmonologists more involved in their care earlier? That’s a question Children’s of Alabama pulmonologist Ammar Alishlash, M.D., wanted to answer. “I felt for us to take care of those patients, especially those with underlying lung disease, would serve them better clinically,” Dr. Alishlash said. 

In the past, the leading cause of death in those with sickle cell disease was infections. But the use of prophylactic antibiotics changed that. Today, it’s acute chest syndrome (ACS), marked by shortness of breath, low oxygen levels and fever. Many patients progress to respiratory failure, and some die. Yet lung specialists are not usually involved in their care while in the hospital or after discharge. Instead, in most children’s hospitals they are managed solely by hematologists. 

“The problem is, we don’t have any specific treatment targeted for acute chest syndrome,” said Dr. Alishlash. Instead, patients are managed with supportive therapy, including oxygen, fluids, antibiotics and sometimes invasive or non-invasive ventilation. 

Now Dr. Alishlash is on a mission to change that dynamic. He’s launched a three-pronged research initiative: identifying risk factors for ACS to proactively recognize children with a higher risk, developing clinical pathways to prevent progression and mortality and researching novel therapies to treat the condition. 

“I became interested in this condition because I feel that, as pulmonologists, we have experience with other lung diseases,” he said. “We can apply our knowledge from other lung diseases to the sickle cell population, which could open a lot of doors for diagnosis and new treatments.” 

So far, Dr. Alishlash has instituted a clinical pathway to standardize the care children with ACS receive after admission. The pathway has been in place for about 18 months, and the results are encouraging, with a nearly 50 percent reduction in length of stay. In addition, all patients have survived. Previously, one out of every 100 children would die. “That’s pretty significant, especially when you’re talking about children, who are typically between 2 and 4 years of age when they are most likely to develop ACS,” he said. 

Dr. Alishlash has also made progress in identifying risk factors for ACS in children with sickle cell disease. One is nocturnal hypoxemia, when oxygen levels drop at night. This seems to induce the sickling and is associated with increased risk of ACS.1 He also found a correlation between the neighborhood where patients live and ACS, due to, he thinks, air quality, socioeconomic factors and greater stress.2 

On the laboratory side, Dr. Alishlash and his team are using a sickle cell mouse model to test potential treatments as well as identify triggers. One interesting finding is that chlorine can cause sickling, leading to the release of heme from red blood cells, which is toxic to the lung endothelium and subsequent development of ACS. A medication called hemopexin, however, scavenges the free heme. When given to mice exposed to chlorine who developed ACS, hemopexin reduced the death rate from 80 percent to 20 percent.3 

At the same time, Dr. Alishlash has started a twice-monthly clinic for sickle cell patients with underlying lung disease. The clinic is very busy, he said. “And patients’ outcomes are improving, which is very encouraging.” 

1 Nourani AR, Rahman AKMF, Pernell B, et al. Nocturnal hypoxemia measured by polysomnogram is associated with acute chest syndrome in pediatric sickle cell disease. J Clin Sleep Med. 2021;17(2):219–226.

2 Alishlash, AS, Rutland, SB, Friedman, AJ, et al. Acute chest syndrome in pediatric sickle cell disease: Associations with racial composition and neighborhood deprivation. Pediatr Blood Cancer. 2021; 68:e28877

3 Alishlash AS, Sapkota M, Ahmad I, et al. Chlorine inhalation induces acute chest syndrome in humanized sickle cell mouse model and ameliorated by postexposure hemopexin. Redox Biol. 2021;44:102009. doi:10.1016/j.redox.2021.102009

Hematology and Oncology, Inside Pediatrics

Asthma, Sickle Cell Disease and Trauma – Connecting the Dots


Brandi M. Pernell, DNP, assistant professor of Pediatric Hematology and Oncology

Take a child with sickle cell disease who is already at a significantly higher risk for asthma, pain and acute chest syndrome—the leading cause of death in these children—and mix in adverse childhood experiences (ACEs) such as violence, racism, abuse, parental death or divorce. The result: sicker children who, due to toxic stress exposures, are more likely to experience poorer health outcomes. 

That’s what Brandi M. Pernell, DNP, an assistant professor of pediatric hematology and oncology who works at the Children’s of Alabama dedicated pediatric sickle cell clinic, found in her research. 

“The literature shows that those who experience ACEs early in life have a higher risk of chronic conditions like asthma, cardiovascular disease, and obesity”—even cancer, Dr. Pernell said. But until her work, there was limited documentation in the sickle cell literature about ACEs. What is known is that acute stress is a common trigger for pain episodes in children with sickle cell disease. Pernell is now connecting the dots to show that ACEs increase asthma risk in these children which, in turn, leads to an increased risk for pain and acute chest syndrome.  

Her findings highlight the need to screen children with sickle cell disease, particularly adolescents, for ACEs and, if found, implement protective factors and buffering mechanisms to address the physiologic sequelae from these toxic exposures. 

She’s already begun that process, teaming with the local chapter of the Sickle Cell Foundation to promote social and emotional competence and resilience among affected adolescents. That community-based approach is important, she said. “I believe we need to meet families and patients where they are,” she said. And the Foundation has a different relationship with patients and families than the clinic staff. “We address the medical side, but ACEs are things happening in the home and neighborhood,” said Dr. Pernell. 

For Dr. Pernell, the work is more than a scientific endeavor; it’s personal. She felt called to this research, she said, both as a Black woman (sickle cell primarily affects Black people) and as a healthcare provider, particularly given the events of 2020. “In the wake of COVID and the social and racial uprising prior to and throughout 2020, it just spoke to me,” she said. So when she joined the University of Alabama at Birmingham faculty in 2016, this is where she focused her research. “I can relate to my patients in a way that some others can’t,” she said. “I’ve experienced some of the same things they have.”  

“If not me, then who?” she asked, quoting the late congressman and civil rights leader John Lewis. “If not now, then when?”  

Hematology and Oncology

Pain Clinic Provides Safe Space for Sickle Cell Patients to Receive Treatment

Raven Myrick, CRNP, right, places a virtual reality headset on patient Olivia Parker in Children’s of Alabama’s Sickle Cell Pain Clinic.

Throbbing. Sharp. Pounding. Dull. Stabbing. Cutting. Gnawing.” That’s how patients describe the pain of sickle cell disease.[1]

While current guidelines call for patients to receive pain medications within an hour of arriving at a treatment center or emergency room (ER), that’s difficult to achieve in a busy emergency department (ED), said Jeffrey Lebensburger, D.O., MSPH, who directs the Cancer and Blood Disorders’ hematology section at Children’s of Alabama. This delay in pain relief allows the pain intensity to increase and may lead to a child requiring hospitalization. In addition, in this era of an opioid epidemic, more families report discrimination when they ask for opioids for pain and are accused of drug-seeking behavior.

That’s why Children’s started its own sickle cell pain clinic, Lebensburger said. It’s not just for patients in crisis. “About half our patients also experience daily, chronic pain,” he said.

Targeting Pain

The clinic has four main goals:

  • Provide care in a familiar setting
  • Reduce the number of hospitalizations
  • Get the patient’s pain under control more quickly
  • Provide non-medicine treatment strategies for pain

The clinic is run out of the regular pediatric hematology clinic with a dedicated nurse practitioner, Raven Myrick, CRNP. Patients can call a hotline or email the hematology team any time and get a same-day or next-day appointment. Eventually, the team would like to offer night hours.

“Our families appreciate being able to go to the clinic versus the ER,” Myrick said. “It’s a familiar, nonjudgmental atmosphere. It’s not our job to say if they are having pain or not. Our job is to make them feel comfortable and to show that we care.”

“It’s not a cure for their disease,” she said, “but the pain clinic gives them hope that someone is working to make them feel better.”

Virtual Reality as Treatment

The clinic uses Starlight Virtual Reality (VR) headsets, donated to Children’s of Alabama by the Starlight Children’s Foundation, to teach kids how to relax and breathe through the pain. Studies have found that VR can reduce pain sensation. When patients come to the clinic, they first spend at least 10 minutes with a VR deep breathing/visualization program. Then they can continue to use other programs as a distraction technique or even just watch movies. “Being able to watch Netflix in the virtual reality environment without cues from other people provides superior distraction to non-virtual reality distraction,” Lebensburger said. Then they go home with a list of relaxation apps to download on their phones.

Patients also receive pain kits to help with distraction, including items like squeezable balls and Silly Putty, as well as their own “tools,” such as action figures and trading cards that they can only play with during a pain crisis.

The clinic has seen more than 30 patients since it opened in Marchand had just three hospitalizations, which is “an amazing outcome for our patients,” Myrick said.

“We know our patients and are familiar with what works for them with use of our Individualized Pain Plans,” Myrick said.

Cancer Fighters

Get more information about the Cancer and Blood Disorders Program at Children’s of Alabama.

[1] Ballas SK, Gupta K, Adams-Graves P. Sickle cell pain: a critical reappraisal. Blood. 2012;120:3647-3656;