Harlequin Ichthyosis

What is Harlequin Ichthyosis?

Harlequin Ichthyosis is a rare genetic disorder that affects the integumentary system. Infants with this condition are born with hard, thick skin that cracks and splits apart leaving them highly susceptible to infection, dehydration, and temperature instability. Often, infants with Harlequin Ichthyosis have limited movement in their extremities due to the thickness of their skin, which may hinder the infants’ ability to perform essential functions such as eating and breathing. Facial features such as the eyelids, nose, mouth, and ears may also be distorted, especially in the first few weeks of life.

The prefix “ichthy” is taken from the Greek word for fish, referring to the scaly appearance of the skin. Each year, over 16,000 babies are born with some form of Ichthyosis. Harlequin Ichthyosis is the rarest and most severe form of Ichthyosis. The term “harlequin” comes from the characteristic clown’s smile seen in newborn infants with this condition, caused by excess tension from the skin that pulls the mouth wide open. The exact prevalence of this condition is unknown, but it is estimated to be less than 1/1,000,000. The risk of mortality is high during the neonatal period, especially in rural areas that lack access to highly specialized neonatal care. With early diagnosis and treatment, more infants with this condition are surviving into adulthood.

What’s happening inside the body?

Harlequin Ichthyosis Photo 5

Photo courtesy of ghr.nlm.nih.gov

In 2005, Harlequin Ichthyosis was linked to a mutation in the ABCA12 gene. This gene is essential for the normal development of skin cells in the body because it holds the instructions for making special proteins called “ATP-binding cassette transporters”. The purpose of these transporters is to assist with fat (lipid) transport to the outermost layer of the skin.

The skin is has three layers called the hypodermis, dermis, and epidermis. The hypodermis, or innermost layer of the skin, is made up of connective tissue and fats. The dermis contains the hair follicles and the sweat glands. The epidermis, which is the layer of skin that is primarily affected in Harlequin Ichthyosis, provides a barrier for the body. The epidermis is essential in thermoregulation and preventing infection. People with Harlequin Ichthyosis typically either have an absence of the ABCA12 gene, or they have a version of the protein that is too small to properly transport lipids. Since lipids are essential for the normal development of skin, the inadequate lipid transport prevents the skin from forming an effective barrier. Normal skin is elastic, smooth, moist, and intact. In comparison, the skin of an infant born with Harlequin Ichthyosis has hard, thick scales that pull apart, creating deep fissures in the skin that leaves the body vulnerable to infection. Without lipids, the skin loses its elasticity, causing it to become tight. This tightness can cause distorted facial features, difficulty breathing, and restricted movement of the extremities. The body requires extra calories to maintain normal function, so physical development may be delayed due to the amount of energy the body has to place into creating skin.

What are the causes of Harlequin Ichthyosis?

Harlequin Ichthyosis is caused by a mutation in the ABCA12 gene. It is inherited in an autosomal recessive pattern, which means that both parents need to be carriers of the mutated gene. Typically, carriers of this condition do not show any signs or symptoms, so they are unaware that they carry the gene. Genetic counseling is available for people with a family history of Harlequin Ichthyosis, as there is a 25% risk of reoccurrence among carriers.

What symptoms should I be looking for?

Common symptoms of Harlequin Ichthyosis include

Harlequin Ichthyosis Photo 3

Photo courtesy of http://www.hindsdale86.org

  • Hard, thick skin separated by large fissures at birth
  • Severe scaling erythroderma as the infant grows
  • Distorted facial features: ectropion (eyelids everted), eclabium (mouth forced due to skin tension), ears appearing to be misshapen/missing, nasal hypoplasia
  • Alopecia (sparse hair)
  • Small, swollen hands/feet
  • Prematurity
  • Hypernatremia (high sodium levels in the blood)
  • Dehydration
  • Temperature dysregulation
  • Frequent infections
  • Difficulty breathing
  • Poor suck reflex and difficulty feeding
  • Delayed physical development
  • Short stature

Are there any tests that confirm Harlequin Ichthyosis?

Genetic testing is the more definitive way to diagnose Harlequin Ichthyosis. This form of testing can be done both prenatally and postnatally. Early diagnosis is crucial to improving the outcomes of infants born with Harlequin Ichthyosis. With access to high level neonatal care at birth, these infants have a much higher chance of surviving.

Prenatal diagnosis of Harlequin Ichthyosis helps families and health care providers to prepare for the special needs that an infant with this condition will have. Parents with a family history of Harlequin Ichthyosis are encouraged to see a genetic counselor. Ultrasonography may show features suggestive of Harlequin Ichthyosis such as ectropion, eclabium, diffuse scaling, flattened ears, and nasal hypoplasia. For a more definitive test, fetal DNA can be drawn via amniocentesis or chorionic villus sampling to test for mutations in the ABCA12 gene.

DNA testing is used for diagnosis postnatally. In addition to DNA testing, many health care providers initially diagnose the condition based on its clinical presentation. A skin biopsy of cutaneous tissue may show certain characteristic features, however the biopsy is not typically clinically necessary.

What are the treatment options?

The treatment of an infant born with Harlequin Ichthyosis is complex and requires the work of a multidisciplinary team. It involves medications, supportive therapy, infection control, and daily skin care. Treatments include

  • Medications
    -Retinoid administration within the first week of birth (Etretinate or Acitretin 1 mg/kg body weight) to help accelerate
    the shedding of skin
    -Isotretinoion 0.5mg/kg/day may be given orally in the first few days to increase limb movement, skin pliability, sucking
    reflex, and eyelid closing
  • Supportive Therapy
    -Place infant in a high-humidity incubator
    -Umbilical lines are often needed for monitoring and treatment
    -Insert a feeding tube as needed for decreased suck reflex or feeding intolerance
    -Initiate IV fluids to prevent dehydration
    -Lubricate the eyes with sterile lubricant if eyelids are forced open
  • Infection Control
    -Antibiotic treatment as the thick skin peels off in the first few weeks of life
    -Daily skin assessment to identify any areas of impaired skin integrity
  • Skin Care
    -Bathe infants at least twice daily for at least 30 minutes
    -Apply bland, fragrance-free lubricant to skin frequently

*Note: Please visit the “Links and Resources” page for a list of references used for this post

 

The Infamous First Post

I created this blog about a month ago, but I have delayed posting my first blog. At first I thought I would blog about Bronchopulmonary Dysplasia. I researched the topic for weeks, taking over 20 pages of notes. However, every time I went to write the post, it just didn’t feel like the right way to start off this blog. I looked over a long list of common conditions that we see often in the NICU, but again, nothing felt quite right. What a way to start off… darn writer’s block! After weeks of searching, I finally thought of the perfect way to start off this blog that is so important to me. A little over a year ago, I was interning in the NICU in a hospital in India. While I saw many different cases, one little baby changed my life, and I couldn’t be more grateful. Instead of a scientific, evidence based post, this one is personal. This is an excerpt from the journal that I kept while I was interning in a NICU in India, where I encountered a very rare case of Harlequin Ichthyosis. My next post will explore the etiology, causes, pathophysiology, and treatment of this condition, but this first post is taken directly from my personal journal, so that you can understand why I am so passionate about researching neonatal conditions. I hope that you enjoy, and thanks for reading!

“Every week, I shadow in the NICU at a major hospital in India. This hospital is one of the best in the region, so parents bring their sick infants from far away to seek treatment. The NICU has about 25 beds. Also included in my wing is a septic NICU with 5 beds, and a step-down unit with about 20 beds.  I typically spend about 15 hours/week in the NICU, observing the nurses, going on rounds with the doctors, watching deliveries that necessitate having NICU staff present, and both routine and emergency neonatal care. I’ve learned a lot, seen a lot, and have even been able to help out a bit, depending on the case. I’ve seen preterm babies, severe RDS, CCAM, diaphragmatic hernia, meningomylocelle, hydrocephaly, infantile seizures, meconium aspiration syndrome, meningitis, albinism, pulmonary hemorrhage, and persistent pulmonary hypertension of the newborn (PPHN), just to name a few. I’ve learned more about neonatal conditions in the past month than I’ve learned in my entire nursing career, which is wonderful. Overall my experience in the NICU has been a wonderful one. There’s only one case that darkens that memory, and several months later, I’m still thinking about it almost on a daily basis.

When nursing students first start their schooling, many of the older nurses laugh about how optimistic they are. Many nursing students think that they’ll be the superhero nurses who save all of their patients, and make countless lives better by their amazing nursing skills. While  nurses certainly have the power to save many lives and better their patient’s days, there’s another side to nursing. Every nurse, even the very best nurse in the entire world, will encounter death. Many nursing students are scared of having their first patient die, or are just unsure of what to expect. I actually have a slightly different experience. My very first job was as a home hospice aid, which was essentially helping an elderly lady with terminal cancer to maintain as much independence as possible as her body began to shut down. I entered into the job knowing that my patient would die, and through that job I was able to feel more comfortable with the idea of death. Knowing that every shift there was a possibility of my patient dying caused me to really look at my own self concepts of death, and that helped me to become more ok with the idea of death.

While death at all ages is hard, pediatric and neonatal deaths tend to be particularly difficult because the infant or child hasn’t lived a full life. You want to do everything that you can to save them, but when everything fails, sometimes there’s nothing that you can do but help support the patient and the family through the course of the disease. I want with all my heart to be a NICU superhero, but I know that sometimes, there will be a baby that is just born too early to survive, or there will be a baby that is too sick to make it. It’s hard, to come to terms with the death of your baby patient, but you learn that it’s part of the job. You learn to help support the parents, to do as much as you can to make the infant comfortable, and to make the very best of the situation that you can. If you can do all that but the baby still dies, that’s still a superhero NICU nurse in my mind. That superhero that I want to be always cares, always supports, always does everything physically possible, never giving up until every ounce of hope is gone, and every avenue has been explored. The one day that I couldn’t be a superhero NICU nurse will always haunt my mind. It will be with me forever, and it motivates me to be that superhero NICU nurse every single day once I get my RN license.

It was a normal shadowing day in the NICU when I went to the sink to scrub in. While washing my hands, I saw a large group of interns and doctors huddled around a crib. That’s a pretty common occurrence in a NICU this large, as there’s usually at least one very sick infant. As soon as my hands were dry, I headed over to the cradle. I looked in, and laid my eyes upon a very, very rare case of Harlequin Ichthyosis.

Photo courtesy of encyclopediadramatica.se

This photo is not of the actual baby, but the clinical presentation and severity was almost identical. I’m including this picture not to scare you or to gross you out, but so that you can understand what this baby must have been going through. All of this baby’s skin was peeling off. Every inch of it was red, oozing, and peeling. The baby was inconsolable, crying shrill cries and writhing in pain. I had never seen this condition before. I tried looking it up in my NICU book, but I couldn’t find anything about the condition. I didn’t know what I could possibly do for that infant. Normally, I rock the crying babies for the nurses, feed them (if age-appropriate), or change their diapers. Anything basic that I can do to help out the nurses and keep the babies calm. It felt as if there was nothing that I could do for this baby. I had never felt so helpless in my life.

The baby continued to cry, and I tried to see other patients, but I just couldn’t leave that baby. The other nurses had tried comforting him, but gave up because they needed to tend to their other patients as well. This condition is very painful, as all of the layers of the skin are peeling off at once. However, this poor infant had such a severe case that they were unable to insert an IV line anywhere…the skin would just fall off. They were giving him oral Tylenol, but it seemed that it wasn’t touching the infant’s pain, as the infant would just lay screaming for hours. They tried a pacifier with oral sucralose, but again, no effect. The baby screamed and screamed, but nothing would comfort him. He couldn’t even be picked up, because everywhere you touch the skin falls off. His eyes were red and were bulging out of their sockets, but there wasn’t much that could be done to help the situation.

I spoke with the doctors, and they said that there was no chance of survival for this infant. His condition was too severe, and there’s no cure for the disease. If by some miracle the infant was able to survive to childhood, he would have such severe disabilities and pain problems that it would have a terrible quality of life. As a NICU nursing student, especially in India, I’ve grown to understand that some of my babies will die. What I couldn’t handle was that this infant would die in pain, having the only life it ever had be several days of being separated from its mother, writhing in pain on a banana leaf. Students were gathering around, shining lights in the infant’s already bulging eyes in order to get a better picture of this rare case. I wanted to scream, to tell them to all go away.

I spent several hours next to that baby boy. At first I felt awkward, wanting so badly to hold him but knowing that I couldn’t. I held his pacifier to his mouth, giving him oral sucralose when the pain seemed to worsen. I sing to all of the babies that seem to be in pain, or that won’t fall asleep. I’m self-conscious about my singing voice, so here I’ve taking to singing in French because no one in the NICU knows any French songs, or how they’re actually supposed to sound. I stood there for two hours, singing to the baby, offering him the pacifier, and telling him that I thought he was beautiful, even if he didn’t look like all of the other babies in between the songs. It might sound stupid, but I wanted him to at least know love for a little while. I think it was too hard for his mother to be there, because I didn’t see her there at all. Every baby deserves to be loved, especially this one who’s life was cut so short.

After two hours, I couldn’t handle anymore. I had this yearning to research that I’ve never felt before. I left and literally almost ran to the library. I researched for hours, only finding cases of infants who had the condition and died, or who had access to very advanced technology that was not available in this setting, and even if it were, the results still had poor outcomes. I poured through articles, and finally found one tiny little tidbit of information that might help this poor baby. There was a single documented case of treatment of sterile gauze soaked in slightly chilled, sterile saline over the eyes that helped to decrease the swelling and pain in the eyes. Excited after hours of research to finally find at least one tiny thing that might help ease this infant’s suffering just a little, I went back to the NICU. I told the nurse about what I had read, and she said that she would discuss it with the doctors to see if it might be a viable option. I was so excited. I came back the next day, and found out the baby had died before they could try the intervention. I felt like such a failure. I felt like I hadn’t done enough. Not only had I not pushed enough for trying this intervention, but I hadn’t even been there for that long with the baby during its pain and suffering. For about a day or two I felt like a failure. Then, I just became determined.

Through this whole experience, I researched in a way that I had never researched before. I threw aside all of my assignments that I had due for my classes, and just researched my heart out. While it was tedious and frustrating at times, I learned so much. I was able to put in the time for my patient that a doctor might not be able to devote to a single patient, depending on his or her caseload. I want to be the NICU superhero nurse that does more than just her job description. I want to keep researching ways to improve the lives of all of the infants that I have, not just the terminal ones. It really built in me a passion to keep fighting for my infants, because even if it’s just a tiny thing, it might just make the life of an infant just a little bit better.”