Topical Therapy in Pediatric Atopic Dermatitis Andrew C. Krakowski, MD,*
Transcription
Topical Therapy in Pediatric Atopic Dermatitis Andrew C. Krakowski, MD,*
Topical Therapy in Pediatric Atopic Dermatitis Andrew C. Krakowski, MD,*,† and Magdalene A. Dohil, MD*,† With a prevalence of 10% to 20% in the first decade of life, atopic dermatitis (AD) is one of the most common skin disorders in young children. It is a chronic illness with limited therapeutic options. Topical anti-inflammatory agents remain at the core of medical management; however, their efficacy must be balanced with safety concerns, especially as they relate to the pediatric population. This article discusses the principles of topical AD therapy with a detailed review of the differences between topical corticosteroids and topical calcineurin inhibitors. It also includes specialized topical treatment strategies for AD, such as wet wraps and diluted bleach baths, and highlights the most common challenges to patient compliance in atopic dermatitis. Semin Cutan Med Surg 27:161-167 © 2008 Elsevier Inc. All rights reserved. Importance of Recognition and Management C linicians should recognize that atopic dermatitis (AD) is a skin condition that impacts an individual child’s overall physical, emotional, and social well-being.1 Pruritus, a key feature of AD, often leads to a vicious cycle of itching and scratching that further traumatizes an already compromised epidermal barrier thought to be related to numerous “outside-inside-outside” factors such as reduced ceramide levels, increased levels of endogenous proteolytic enzymes, and downregulation of cornified envelope genes such as the filament-aggregating protein filaggrin.2-4 Barrier dysfunction results in increased transepidermal water loss, xerosis, microbial colonization, and secondary infection. Beyond these physical changes, AD can affect a child’s psychosocial state in a variety of ways that include disturbed sleep, decreased school performance (marked by an inability to focus), behavioral problems, low self-esteem (compounded by teasing from other children), decreased participation in extracurricular activities, family stress, and anxiety. In children with AD, the impairment of their health-related quality of life (HRQL) may at least equal that experienced in many other chronic diseases of childhood, including diabetes and cystic fibrosis.5,6 Family dynamics may also suffer significantly at the *University of California, San Diego, CA. †Rady Children’s Hospital, San Diego, CA. Andrew C. Krakowski and Magdalene A. Dohil have served as investigators for multiple pharmaceutical-sponsored studies on atopic dermatitis, but they have no personal or family equity interest in any company. Address correspondence to: The Eczema Center, c/o Magdalene A. Dohil, MD, Division of Pediatric and Adolescent Dermatology, 8010 Frost Street, Suite 602, San Diego, CA 92123. E-mail: mdohil@chsd.org. Website: www.EczemaCenter.org 1085-5629/08/$-see front matter © 2008 Elsevier Inc. All rights reserved. doi:10.1016/j.sder.2008.04.003 physical, emotional, and functional levels, as parents and caregivers try to live with the limitations imposed by this chronic disease.7 AD represents a huge impact on public health resources. It affects 10% to 20% of children living in developed nations.8 Between 1997 and 2004, the disease accounted for an estimated 7.4 million office visits in the United States alone, with national cost estimates ranging widely from $364 million to $3.8 billion U.S. dollars per year.9,10 These figures will likely increase in proportion to the increasing prevalence of AD, which has risen steadily during the past several decades and is paralleled by increases in the prevalence of asthma, allergic rhinoconjunctivitis, and the emerging entity of eosinophilic esophagitis.11,12 The epidemiologic linkage among AD, asthma, and allergic rhinitis (a.k.a., the “atopic triad”) is especially evident when considered in the context of increasing disease severity.13 Because AD is frequently the first disorder of the atopic triad to manifest, it has been hypothesized that infants with AD—through epicutaneous sensitization that leads to systemic allergic responses and airway sensitization—are predisposed to developing asthma and/or allergic rhinitis later in childhood.14-16 This progression of one disease to another is known as the “atopic march.” An ongoing, long-term prospective study is currently investigating the hypothesis that prompt recognition and intervention of AD early in life may improve outcomes with respect to the clinical course of AD and influence the subsequent development of asthma and allergic rhinitis.17 Foundations for Effective Control of AD A comprehensive long-term strategy should be the overall goal of AD management and, in order of importance and 161 A.C. Krakowski and M.A. Dohil 162 necessity, should consist of the following: educating patients and their families about AD; laying the groundwork for excellent skin care; reducing signs and symptoms of the condition; preventing and decreasing the degree and frequency of flares; modifying the overall disease course; and, possibly, slowing the atopic march. A personalized therapeutic strategy should be tailored to the individual child’s age and needs, extent and localization of AD at presentation, and overall disease course (including clinical severity, disease persistence, frequency of flares, etc.). Physicians should also explain that AD has distinct phases with distinct clinical localization requiring different types of therapies during each phase. Close monitoring for changes in disease status is critical and should support stepwise treatment that is adjusted in tune with the clinical course to allow for transition from acute flare treatment to chronic maintenance therapy and vice versa. This sliding-scale treatment approach allows patients and their families to respond appropriately and promptly to minor disease variations so that more serious sequelae may be avoided. Compliance with treatment recommendations may be maximized by acknowledging parental anxiety about both the disease itself (ie, its chronicity and its lack of cure) and any real or perceived potential side effects of available treatments. One guideline that may help patients estimate the amount of topical medication needed to cover a given area is known as the finger tip unit (FTU), which is defined as the amount of topical medication extending from the tip to the first joint on the palmar aspect of the index finger. It takes approximately 1 FTU to cover the hand or groin, 2 FTUs for the face or foot, 3 FTUs for an arm, 6 FTUs for the leg, and 14 FTUs for the trunk.18 To help assess compliance and guide further management, physicians should perform a careful review of all “in-hand” over-the-counter, homeopathic, herbal, and prescriptive products at each clinic visit. Diligent monitoring of refills is also recommended to assess quality/ quantity of use, overall compliance, and potential medication overuse/interactions. Interventional Education The education of AD patients, their families, and primary caregivers has emerged as a new focus in AD therapy in its own right. Paralleling strategies shown to be effective in managing asthma patients, enhanced patient care centers combine several specialty services (dermatology, allergy, infectious disease, behavioral psychology, etc.) with longer patient appointments, extensive educational curriculums, patient support networks, and the ability to elicit patient/ caregiver feedback as a means of providing more comprehensive care.19-21 This “education as intervention” model may allow physicians to better impress on caregivers that AD is a complex, chronic disorder and that management should be equated to long-term commitment rather than short-term “fix-up.” Results of such targeted patient care studies are starting to be explored systematically.22-25 Further critical evaluation to examine the best way to deliver enhanced patient education and its long-term efficacy, impact on patient/ caregiver quality of life, and cost-effectiveness should be undertaken to better establish its role in AD management. Baseline Skin Care Principles The foundation of AD management rests on daily skin care and typically begins with a child’s bathing regimen. The potential benefits of bathing include skin hydration, cleansing, improved penetration of topical therapies, and the gentle debridement of infected eczematous skin. Use of a moisturizing cleanser is preferred, and highly fragranced soaps or bubble baths should be avoided because of their potential to cause irritation and sensitization. After bathing, caregivers should gently pat the child dry instead of rubbing the skin with a towel, which can be thought of as “scratching in disguise.” Disruption of the stratum corneum barrier during water evaporation and the potential for skin drying may be minimized by the timely and liberal application of a moisturizer/emollient. Although limited data exist to support the notion that emollients and moisturizers improve atopic dermatitis directly, these products are widely used because they improve the xerosis associated with AD.26 In general, ointments contain high concentrations of lipids and are generally more effective than creams or lotions, which are water-based and may therefore dry the skin on evaporation. Ceramiderich products are also useful for retaining moisture in the skin.27 Recently, several novel barrier products have been cleared for marketing by the Food and Drug Administration as “510(k) medical devices” and contain ingredients that their manufacturers claim in addition to moisturizing may help to relieve pruritus, burning, and pain associated with AD. Studies are underway to evaluate the utility of these new products and their potential role in helping to manage AD.28-32 Because compliance in large part dictates the success of any skin care regimen, patient and parental preferences should be carefully considered when selecting an emollient or moisturizer. We further recommend using products that are tailored to local weather conditions, financially-affordable, dye-free, and fragrance-free. Moisturizers/emollients should be used at least twice a day subsequent to any topical pharmacologic therapies to promote absorption of active medications yet provide a good seal of the skin against moisture loss. Bleach Baths The skin of atopic dermatitis patients, partly due to an innate deficiency of certain antimicrobial peptides (so called cathelicidins and defensins) and partly due to the local conditions created secondary to scratching, provides a favorable environment for bacterial colonization and proliferation, especially by Staphylococcus aureus.33 AD patients can have sudden exacerbations of AD because of an overgrowth of S. aureus that can be independent of true secondary bacterial infection, a notion supported by the clinical response of patients with severe AD to antistaphylococcal antibiotics.34,35 Topical and/or oral antibiotic therapy, typically of short duration to avoid the development of bacterial resistance, may Topical therapy in pediatric atopic dermatitis be indicated when signs of overt infection are present. Skin cultures should be considered before treatment as methicillin-resistant Staphylococcus aureus may be an important pathogen in some patients. Diluted bleach baths are currently being evaluated for their role as adjuvant antiinfective treatment to help break the cycle of repeated local skin infections, to decrease the number of methicillin-resistant Staphylococcus aureus outbreaks, and to reduce the need for systemic antibiotics in AD patients with heavily-colonized and/or superinfected skin.36 This technique consists of soaking patients for about 10 minutes in a full tub of lukewarm water mixed with approximately one-quarter cup of chlorine bleach-analogous to swimming in a chlorinated pool. Afterward, patients are rinsed thoroughly with fresh water and are moisturized immediately to prevent desiccation. 163 Patients with AD will experience a flare and require pharmacologic treatment at least intermittently even if skin care regimens and guidelines for trigger avoidance are followed judiciously. Flares of mild-to-moderate intensity are characterized by itching, erythema, and excoriations, papules, and lichenification. More severe flares present with intense and persistent itching, substantial erythema, extensive excoriations, oozing/crusting, and lichenification. Two primary classes of therapeutic agents are used for the treatment of AD: topical corticosteroids and topical calcineurin inhibitors. Both groups of agents inhibit the associated inflammatory response but achieve this through distinct mechanisms of action. sias, hypopigmentation, rosacea, perioral dermatitis, acne, cataracts, and glaucoma. These local side effects can occur more frequently when topical corticosteroids are used under occlusion or applied to thin, sensitive skin areas such as the face, neck, or groin. Systemic side effects, including growth retardation in children, reduced bone density, and hypothalamic-pituitary-adrenal axis suppression, can occur, however, they are rare when medications are used properly.41 Other factors to consider are the risk of flare relapse after discontinuation of treatment and steroid tachyphylaxis. To minimize “steroid phobia,” physicians should anticipate these concerns and stress to patients and caregivers that, despite their well-known potential side-effects, topical corticosteroids remain first-line treatment for atopic flares in the pediatric population; decades of clinical experience and specific pediatric studies support their sensible use (Table 1).42-58 Variation in topical corticosteroid prescribing habits (eg, quantity, frequency, and duration of therapy) is common even among dermatologists.59 Some clinicians start treatment with high-potency topical corticosteroid preparations to induce remission, followed by a relatively quick tapering down of preparation potency as the atopic dermatitis improves. Alternatively, some clinicians use short bursts of high-potency topical corticosteroid preparations followed by moisturizer/ emollient use only until relapse occurs. Yet another treatment regimen advocates more prolonged continuous treatment with less-potent preparations. Drug-specific Food and Drug Administration (FDA) indications should help guide clinicians when educating and instructing patients on topical corticosteroid usage. Topical Corticosteroids Topical Calcineurin Inhibitors (TCIs) Topical corticosteroids remain the first-line pharmacologic therapy for AD. Acting on a variety of immune cells, including T lymphocytes, monocytes, macrophages, dendritic cells, and their precursors, topical corticosteroids suppress the release of inflammatory cytokines and provide effective flare control through their antiinflammatory, antiproliferative, immunosuppressive, and vasoconstrictive actions.37,38 In the United States, topical corticosteroids are classified into groups of roughly equal potency based on a vasoconstrictor assay, which does not consider other factors that influence the therapeutic effect or unwanted side effects such as the state of the skin barrier, the body site involved, disease extent, the age of the patient, concomitant use of occlusion, the amount of steroid applied, and the duration of treatment. The assay does, however, correlate well with clinical efficacy and provides a reasonable guide to the potential for adverse side effects.39 The difference in potency between Class I (most potent) and Class VII (least potent) topical corticosteroids is dramatic and often misunderstood by patients. For example, a Class I preparation like clobetasol propionate ointment 0.05% is approximately 1800 times more potent than a Class VII preparation like hydrocortisone ointment 1%.40 Well-known local tolerability and safety concerns of topical corticosteroids include skin atrophy, striae, telangiecta- Tacrolimus and pimecrolimus, which work by blocking the production and release of proinflammatory cytokines after antigen-specific or nonspecific activation of T cells and mast cells, are currently the only FDA-approved TCIs.60,61 In January 2006, the FDA added a boxed warning to TCI labels, noting that the long-term safety of TCIs has not been established. The warning was added in response to widespread off-label use in the infant population (younger than 2 years of age) and concerns about a potential cancer risk. The risk assessment was based on 3 observations: 1) systemic calcineurin inhibitors have a shared mechanism of action; 2) animal toxicology studies have raised some concerns; and 3) postmarketing reports have characterized rare cases of malignancy (skin cancer and lymphomas). None of the reported lymphomas, however, were characteristic of the posttransplant lymphoproliferative disease type observed with systemic immunosuppression. The safety and efficacy of tacrolimus and pimecrolimus have to date been demonstrated in several short- (6-week) and long-term (⬎2 years) clinical trials.62-64 Data from these clinical trials have shown that pimecrolimus reduces the number and severity of flares, extends the length of time between major flares, and decreases pruritus and other cutaneous signs associated with AD.65 Likewise, long-term, intermittent (once daily, 3-times weekly) maintenance use of ta- Pharmacologic Treatment A.C. Krakowski and M.A. Dohil 164 Table 1 Select Topical Corticosteroids and Their Corresponding Pediatric HPA-Axis Suppression Studies Class Steroid Dosage and Frequency VII Hydrocortisone 1% ointment VII Hydrocortisone 2.5% ointment Alclometasone dipropionate 0.05% cream Desonide 0.05% hydrogel 48.7 to 223.2 mg/m2 BSA/d; 9/14 also intermittently used moderate potency preparations Two times/d VI VI Age Group 3.1 to 10.7 Two times/d Two times/d 6 months to 6 years VI Desonide 0.05% foam Two times/d 6 months to 17 years VI Fluocinolone acetonide 0.01% in protein-free peanut oil Two times/d Study 1: 3 months to 2 years Study 2: 2 to 12 years 3 months to 6 years HPA Studies PC: No change in basal/peak plasma levels but earlier peak seen in AD patients vs. controls42 n ⴝ 40; open label; moderate-tosevere AD; 51% mean BSA affected; duration of test ⴝ 4 weeks n ⴝ 75; open label; mild-to-moderate AD; >25% BSA treated; duration of test ⴝ 4 weeks Study 1: n ⴝ 24; open label; moderate-to-severe AD; >20% BSA affected; duration of test ⴝ 4 weeks Study 2: n ⴝ 32; open-label; moderate-to-severe AD; >50% BSA affected; duration of test ⴝ 4 weeks n ⴝ 43; open label; moderate-tosevere AD; 64% mean BSA treated; duration of test ⴝ 3 to 4 weeks V Fluticasone propionate 0.05% cream V Fluticasone propionate 0.05% lotion V Prednicarbate 0.1% cream Two times/d 4 months to 12 years IV Mometasone furoate 0.1% cream Fluticasone propionate 0.005% ointment Triamcinolone acetonide 0.1% ointment Mometasone furoate 0.1% ointment Fluocinonide 0.1% cream One time/d 6 to 23 months Four times/d; average amount of drug used per day ⴝ 13 to 46 g/d/m2 One time/d 7 months to 8 years n ⴝ 7; open label; severe AD; duration of test ⴝ 6 weeks 6 to 23 months n ⴝ 63; open label; AD (severity not stated); 39% mean BSA affected; duration of test ⴝ 3 weeks n ⴝ 126; open label; moderate-tosevere AD; mean BSA affected ranged from 34% (Cohort 1, BID) to 43% (Cohort 4, QD); duration of test ⴝ 2 weeks III III II I Two times/d; average amount of drug used per day ⴝ 3.8 g for ages 3 to 35 months, 7.7 g for ages 36 to 70 months Two times/d Design n ⴝ 14; moderate or severe AD; 58% median BSA affected; duration of test ⴝ 3 to 10 years (median 6.5 years) n ⴝ 20; open label, parallel; duration of test ⴝ 4 weeks n ⴝ 39; open label; duration of test ⴝ 3 to 4 weeks One or two times/d 3 months to 6 years Cohort 1: 12 to < 18 years n ⴝ 42; open label; moderate to severe AD; 65% mean BSA treated; duration of test ⴝ 3 to 4 weeks n ⴝ 55; open label; mostly moderate to severe AD disease (1 “mild” enrolled); 46.7% mean BSA affected; duration of test ⴝ 3 weeks n ⴝ 97; open label; AD (severity not stated); 41% mean BSA affected; duration of test ⴝ 3 weeks n ⴝ 35; AD (severity not stated); >35% BSA affected; duration of test ⴝ 3 to 4 weeks Cohort 2: 6 to < 12 years Cohort 3: 2 to < 6 years I Clobetasol propionate 0.05% lotion Two times/d Cohort 4: 3 months to < 2 years 12 to 17 years n ⴝ 14; moderate-to-severe AD; >20% BSA affected; duration of test ⴝ 2 weeks CST: All normal43 PC (am): All normal44 CST: Normal in all pts without protocol violations; 1/3 abnormal in patients with protocol deviations45 CST: 3/75 patients with abnormal tests (normalized 4 weeks after treatment)46 CST: All normal47,48 CST: 2/43 patients with abnormal tests; 1 pt with 95% BSA affected normalized 12 days after last study dose; 1 pt with 35% BSA was lost to follow-up49 CST: All normal50 CST: All normal51 CST: 16% of pts with abnormal tests (4/5 tested pts normalized 2 to 4 weeks after treatment)52 CST: 4 pts with abnormal tests53 PC (am/pm): “No substantial difference” 24-HUC: “No notable depression”54 CST: 27% of pts with abnormal tests (5/8 tested pts normalized 2 to 4 weeks after treatment)55 CST: Cohort 1: 1/15 pts in BID group with abnormal test (normalized 2 weeks after treatment) Cohort 2: 2/16 pts in BID group with abnormal tests (1 normalized 8 days after treatment; 1 normalized 2 weeks after treatment) Cohort 3: 1/15 pts in BID group with abnormal test (suspected collection error; not suppressed)56 9/14 pts with adrenal suppression (assessment method not stated)57 HPA, hypothalamic–pituitary–adrenal; BSA, body surface area; PC, plasma cortisol; 24-HUC, 24-hour urinary cortisol; CST, cosyntropin stimulation test. Topical therapy in pediatric atopic dermatitis crolimus ointment in patients with stabilized AD has been shown to significantly increase time between disease exacerbation and total number of disease-free days versus vehicle.66 The incidence of side effects is generally low and includes, most commonly, transient application-site stinging.67,68 The currently available data do not suggest that the use of TCIs is associated with systemic immunosuppression, impacts the delayed-type hypersensitivity response, or has an increased association with skin cancer.69-71 Consequently, the FDA has not requested that ongoing studies with TCIs in pediatric patients be halted. Official indications for use were changed, however, to “second-line therapy for the short-term and noncontinuous chronic treatment of moderate-to-severe atopic dermatitis in nonimmunocompromised adults and children who have failed to respond adequately to other topical prescription treatments for atopic dermatitis, or when those treatments are not advisable” in children 2 years of age and older.72,73 Patients with AD in whom the clinical course is marked by steroid tachyphylaxis, disease persistence, and/or frequent flares, which would otherwise result in an almost continuous need for topical corticosteroid treatment, may find TCIs very helpful. TCIs may also be specifically indicated in sensitive thin skin areas, such as around the eye, face, neck, and genital area, where local safety concerns and systemic absorption are of special concern. Long-term prospective studies investigating the clinical use of TCIs in a pediatric population are currently underway and will hopefully help to clarify these safety concerns.74,75 Combining Topical Therapies Appreciating the risk-benefit profile of both topical corticosteroids and TCIs allows for individualized and optimized patient care. Treatment should be readily adjusted along a sliding scale that takes “best-use” advantage of available ther- 165 apeutic agents. For children with rapid flares, this may mean using short-term bursts of mid- to high-potency topical steroids, typically applied twice daily for about 7 to 10 days (vs the long-term use of less-potent agents) followed by close reexamination of the patient at regular intervals (eg, evaluations at 2, 6, and 12 weeks) to evaluate the efficacy and tolerability of local and systemic therapies. Once control of a flare is achieved, therapy should shift to a less intense treatment with a focus on maintenance and proper skin care at its core. A topical corticosteroid that has been used to treat a flare can now be tapered to a lower-potency agent and from daily to intermittent (eg, thrice- or twice-weekly) application. Transition to TCI therapy for patients with a history of flare recurrence on discontinuation or tapering of topical corticosteroids may be a good choice at this point. The use of TCI monotherapy to control flare recurrence while limiting patients’ extended exposure to corticosteroids is supported by some physicians.76 Wet Wraps Developed more than 20 years ago, wet wraps afford a relatively safe and effective treatment option for patients with severe AD or disease refractory to standard topical treatment (Table 2).77 Wet wraps act as an occlusive barrier that promotes the penetration of topical medications into the skin. They can also increase skin hydration and serve as an effective mechanical barrier to scratching. A recent review of the literature found wet wraps with once-daily application of topical corticosteroids to be an efficacious and safe shortterm intervention in children with severe and/or refractory AD; temporary systemic bioactivity of the corticosteroids was the only reported serious side-effect.78 Wet wraps have been criticized by caregivers for being time-consuming and may cause maceration of the skin and secondary infections if overused or used incorrectly. Paradoxically, they may promote skin dryness if sufficient emollients are not part of the regi- Table 2 Wet Wraps Primer 1. Gather supplies. Topical steroid as prescribed by the physician Emollient of choice (eg, petroleum jelly) Wraps consisting of a bottom, wet layer and a top, dry layer. Gauze wraps such as Kerlex or cotton sleepers, pajamas, or long johns may be used. It is necessary to have two sets of the chosen material on hand. Warm water in a sink or a basin. 2. Apply topical steroid directly to affected areas of child’s skin. Use a tongue depressor to apply medication in order to avoid contamination of the medication supply, to cover large areas quickly and evenly, and to prevent caregivers from being unnecessarily exposed to topical corticosteroids. 3. Apply emollient (eg, petroleum jelly) to affected areas of child’s skin. 4. Soak a single layer of wrap in warm water. 5. Wring out excess water so that the wrap is only slightly damp. 6. Wrap affected area of skin with damp layer of material, making sure not to wrap too tightly. 7. Immediately wrap a dry layer of material over the damp layer. 8. Keep child in a warm, humid environment to ensure that the child does not grow cold as the evaporation process occurs. 9. Leave wraps in place overnight. 10. Change wraps once daily for 3 to 5 days in a row or as instructed by physician. 11. Maintain close contact with physician while using wet wraps technique. Report any suspected side effects or concerns immediately. 166 men.79 Patients should therefore be closely supervised by a physician with experience in the use of wet wraps. Summary Atopic dermatitis in childhood is common and often appears early in life. It is not merely a chronic skin condition, but may adversely affect a child’s overall physical health and psychosocial development. Management should take into consideration the role that the compromised epidermal barrier plays in AD. AD’s chronic and unpredictable course requires that caregivers be educated about the nature of flares and proper use of the primary anti-inflammatory agents, topical corticosteroids, and TCIs in its management. Because atopic dermatitis is a multifactorial disease, treatment needs to be teamoriented with a focus on parent and patient education creating disease perspective and a long-term plan for AD control. References 1. 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