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Stevens–Johnson Syndrome andToxic Epidermal Necrolysis
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Fig. 2 (a) SJS: small blisters with minor epidermal detachment. (b) TEN: extensive detachment of epidermal sheets. (c) Oral and genital involvement in SJS/TEN. (d) Ocular involvement in SJS/TEN
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Conuence of necrotic lesions leads to blistering and detachment of epidermal sheets, revealing areas of denuded, red dermis (Fig.2b). Nikolski’s sign is positive on lesional skin (gentle lateral pressure causes detachable epidermis to slide over the dermis).
Two or more mucous membranes are involved in almost all cases. Conuent erosions are observed on the buccal, nasopharyngeal, oro­pharyngeal, ocular, anal, and genital mucous membranes (Fig. 2c). Lips are usually exten­sively eroded and coated with hemorrhagic crust. Extensive laryngeal lesions are associated with a higher risk of short-term pulmonary involvement (Bequignon et al. 2015). Ocular involvement is of varying severity (Gueudry etal. 2009) and is graded according the Power or Sotozono systems (Power et al. 1995; Sotozono etal. 2015). Eyelid edema, conjuncti­val injection, membranous conjunctivitis, and chemosis are the most frequent lesions (Fig.2d).
Table 2 Acute stage lesions in SJS/TEN: location, sequelae, and local treatment (Ingen-Housz-Oro et al.
2018a; Bequignon etal. 2015; Gueudry etal. 2009; Power
Site involved Acute stage lesion Sequelae Local treatment
Skin Purpuric macules,
atypical targets, blisters, erosions, denuded dermis
Eye Hyperemia, tearing,
chemosis, photophobia, adhesions, erosions
Mouth Erosions, blisters,
mucosal hemorrhage, labial hemorrhagic
crusts Ear, nose throat
Genital Erosions, blisters Genital synechiae, vaginal
Pulmonary Bronchial epithelial
Digestive tract Psychiatric Anxiety, stress Post-traumatic stress disorder,
Erosions, blisters,
epiglottitis, nasal
obstruction, epistaxis,
otorrhea
necrosis, respiratory
failure
Digestive necrosis Diarrhea
Dystrophic scars, hyperpigmentation, alopecia, nail loss
Dry eye, synechiae, symblepharon, loss of vision
Dental agenesia, sialadenitis, tooth decay
Cough, chondritis, otalgia, external otitis, scars, dysphonia, dysphagia, conductive deafness
stricture, phimosis DLCO diffusion impairment, dyspnea, bronchiolitis obliterans
anxiety, depression
Severe forms lead to corneal epithelial defects, corneal ulceration and symblepharon formation (Gueudry etal. 2009).
Disease progression is time-limited (7–10days). The skin then heals (reepithelializa­tion), the rate of which depends on the patient’s general medical and nutritional status. Mucous membrane healing tends to follow skin resolu­tion. In general complete mucocutaneous healing is achieved within 1month.
Visceral involvement includes transient liver enzyme increase, renal dysfunction, neutropenia, lymphopenia, bronchial and digestive tract epi­thelial necrosis (Lebargy etal. 1997; Gendreau etal. 2019). Table2 summarizes the mucocutane- ous lesions which typify the acute phase of SJS/ TEN. Severe renal involvement needing renal replacement therapy and respiratory failure requiring mechanical ventilation are factors which indicate a poor prognosis (Papo et al.
2017; de Prost etal. 2014).
etal. 1995; Sotozono etal. 2015; Hajj etal. 2019; Lebargy et al. 1997; Gendreau et al. 2019; Papo et al. 2017; Creamer etal. 2016)
Antiseptic baths or diluted antiseptic spray, ointment-based emollients, nonadhesive hydrocellular dressings
Ocular emollients, eye drops, topical vitamin A ointment, inammatory debris removal with daily saline rinses, amniotic membrane transplantation with severe erosions/ulcers, scleral lens for cicatricial complications Topical analgesia, mouthwashes, local administration of adrenaline and tranexamic acid for mucosal bleeding
Analgesia, emollients
Emollients, debridement
Bronchoscopic clearance of necrotic mucosal debris
Anxiolytic, analgesia
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The main complications result from acute skin failure (Roujeau 1992). Most frequent are life­threatening pulmonary or systemic infections. Denuded skin is the main portal of entry for microorganisms; however, translocation of gut bacteria is also implicated in TEN-related septi­cemia (Lecadet et al. 2019; Chosidow et al.
1991). In most instances bacteremia involves
patients with > 10% BSA detachment, that is SJS-TEN overlap or TEN (de Prost etal. 2010; Koh etal. 2019). Sequential skin cultures are use­ful to monitor cutaneous bacterial colonization and predict which bacteria are involved in blood­stream infections, thus guiding antibiotic decision- making (see below) (Lecadet et al.
2019; de Prost etal. 2010).
The SCORTEN score, introduced in 2000, is used to predict mortality during the acute phase. Seven parameters are assessed at admission and/ or during the 5 rst days of hospitalization, each parameter is one point and therefore SCORTENs vary between 0 and 7. Four of SCORTEN’s parameters are clinical: age ≥40 years-old; detachment >10% BSA; underlying malignancy; pulse rate 120/min. Three SCORTEN parame­ters are laboratory results: serum urea >10 mmol/L; serum bicarbonate <20 mmol/L; blood glucose >14mmol/L.Mortality risk varies from 3% for patients with SCORTEN of 0 or 1, to 90% for those with SCORTEN 5–7 (Bastuji­Garin etal. 2000; Guégan etal. 2006).
Skin biopsy for histology and direct immu­nouorescence is mandatory at admission. Histology shows keratinocyte necrosis with full- thickness epidermal necrolysis and a mini­mal dermal inltrate (Ortonne 2018; Valeyrie­Allanore et al. 2013). The dermatopathology of SJS/TEN is similar to other diseases of the acute syndrome of apoptotic pan-epidermolysis (ASAP), such as TEN-like lupus erythemato­sus, Mycoplasma pneumoniae-induced erythema multiforme major, and acute graft-versus-host disease (Ting et al. 2004; Amode et al. 2018). Direct immunouorescence yields negative results, excluding autoimmune blistering dis­eases such as linear IgA bullous disease, which may mimic TEN especially if induced by vanco­mycin (Chanal etal. 2013; Garel etal. 2019).
5 Management andTreatment
Patients with SJS/TEN should be admitted to a unit with specialist expertise in the management of skin loss syndromes and acute skin failure (specialized intensive care unit or burn unit) (Ingen-Housz-Oro etal. 2018a; Kaffenberger and Rosenbach 2014; Traikia et al. 2019; Creamer etal. 2016). Survival is associated with an early diagnosis (within 7days of onset) (Palmieri etal.
2002), and supportive care delivered in a
specialized unit. A TEN multidisciplinary team should be coordinated by a specialist in skin fail­ure (usually a dermatologist) and must include clinicians from skincare nursing, intensive care, ophthalmology and respiratory medicine.
The identication of the culprit drug and its withdrawal must be undertaken immediately. Early discontinuation of the culprit has been shown to improve prognosis (Garcia-Doval etal.
2000). Following a diagnosis of SJS/TEN the
patient should carry an allergy card to prevent inappropriate reintroduction of the causative drug. As well as the standard name of the culprit, the allergy card should list relevant generic and brand names, as well as drugs of same structure and family.
6 Supportive Care
During the acute phase the main complications of SJS/TEN result from skin failure (Roujeau 1992) and its potential to progress to multiorgan failure. Therefore, the goal of supportive care is to rees­tablish hemodynamic equilibrium and to prevent life-threatening sequelae (mainly hypovolemia, renal insufciency, thermal dysregulation, sepsis and respiratory complications) (Table3) (Ingen­Housz- Oro et al. 2018a; Creamer et al. 2016). Resuscitation to offset massive transcutaneous water loss necessitates uid replacement which should be started urgently and adjusted daily. The supply of intravenous uids and electrolytes should be adapted to the patient’s needs on a case-to-case basis. At admission, a formula such as the Brooke one (Pruitt etal. 1971) can be used (1.5mL × % detached and detachable BSA × kg
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Table 3 Preventative management for the acute compli­cations in SJS/TEN (Ingen-Housz-Oro et al. 2018a; Creamer etal. 2016)
Acute stage complication Prevention
Dehydration Limitation of thermal and caloric
losses Enteral feeding Fluid replacement using the formula (1.5mL × % detached and detachable BSA × kg body weight), adapted to the diuresis (objective: 0.5–1mL/ kg/h)
Septicemia Antiseptic baths or diluted antiseptic
spray No prophylactic antibiotics Repeated blood culture and qualitative and quantitative skin cultures Avoid cannula insertion into lesional
skin Respiratory failure
Pain, anxiety Opiate analgesia, hydroxyzine
Airway humidication
Removal of mouth debris
Nasotracheal aspiration
Avoid mechanical ventilation, unless
absolutely necessary
body weight), then followed by an adaptation according the diuresis (aiming for 0.5–1 mL/ kg/h). Peripheral cannulas sited on nondetached skin are preferred for vascular access (Ingen­Housz- Oro etal. 2018a; Palmieri etal. 2002).
Environmental temperature should be raised to 28–32°C to limit caloric and thermal losses. Nutritional hypercaloric and protidic enteral feeding is initiated through a nasogastric tube (aiming for 20–30 kcal/kg/day), except in the case of a severe esophageal involvement (Gendreau etal. 2019; Weinand etal. 2013).
Opioid agonists are generally used (with respiratory surveillance) to alleviate skin and mucosal pain (Ingen-Housz-Oro et al. 2018a; Valeyrie-Allanore etal. 2011).
Tracheal intubation and mechanical ventila­tion are necessary in about 25% of cases. The need for mechanical ventilation can be antici­pated in patients with extensive laryngeal involve­ment and in situations when uncontrolled pain limits patient handling for skin and mucosal care. Mechanical ventilation in SJS/TEN is associated with a worse outcome (de Prost etal. 2014).
Antibiotic prophylaxis is not recommended; however, antibiotics should be introduced with­out delay when clinical features and laboratory results suggest sepsis (hemodynamic instability, hypothermia, oliguria, elevation of procalcitonin) (Ingen-Housz-Oro etal. 2018a; Koh etal. 2019; Palmieri etal. 2002). The results of skin cultures can predict bacteria involved in bloodstream infections and guide antibiotic prescribing (Lecadet etal. 2019).
If Mycoplasma pneumoniae is suspected (young age, no culprit drug, cough and high fever at disease onset), treatment with a macrolide is recommended until the results from nasopharyn­geal PCR and specic serology are obtained (McPherson etal. 2019).
7 Local Management ofSkin
andMucous Membranes
Caution is needed in handling the patient: particu­lar care must be taken to minimize shearing forces applied to the skin which might increase epider­mal detachment. Skin cleansing should be per­formed daily with a diluted solution of antiseptic, such as chlorhexidine, delivered in a bath or by aerosolized spray. There is a lack of consensus regarding the best dressing to be used to denuded areas; however, we recommend white petroleum (white soft parafn) to be applied to all detached areas and nonadhesive dressings (e.g., hydrocel­lular) to cover pressure points, particularly on the back (Ingen-Housz-Oro etal. 2018a; Firoz etal.
2012; Struck et al. 2010). Topical antimicrobial
agents, including sulfadiazine ointment (contain­ing antibacterial sulfonamides), are not recom­mended (Ingen-Housz-Oro etal. 2018a).
In contrast with burns, we do not recom­mend skin debridement. Necrotic epidermal sheets act as a natural biological dressing (Castillo etal. 2018).
During the acute phase frequent applications of an appropriate emollient to ocular, oral, nasal, genital and anal mucosae will limit brotic scar­ring. Local care to the eyes is of particular impor­tance: preservative-free lubricant eye drops and/
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or a vitamin A ophthalmic ointment should be administered every 2 h. Regular removal of adhesions by the ophthalmologist is mandatory. In severe cases amniotic membrane transplanta­tion should be considered (Liu et al. 2011; Sharma etal. 2016). The use of topical antibiot­ics, ciclosporine, or corticosteroids has not shown to be benecial in lessening long-term ocular sequelae (Ingen-Housz-Oro etal. 2018b).
8 Immunomodulatory
Approaches
The benets of targeted therapeutic approaches are still being debated (White et al. 2018; Zimmermann et al. 2017). Most published data are case reports and small-uncontrolled series (Sekula et al. 2013; Schneck et al. 2008). The role of immunosuppressants or immunomodula­tory treatments, including corticosteroids (Lee et al. 2012; Morita etal. 2019), cyclophospha­mide (Rajaratnam etal. 2010), calcineurin inhibi­tors (especially ciclosporin) (Valeyrie-Allanore et al. 2010), anti-TNF therapy (Paradisi et al.
2014), and intravenous immunoglobulins (IVIg)
(Bachot etal. 2003; Chen et al. 2010), has been reported with controversial results and without evidence for an unbiased, positive effect on heal­ing or mortality.
High-dose systemic corticosteroids are con­sidered to be a treatment option. However, recent large studies have challenged the therapeutic ef­cacy of systemic glucocorticoids in SJS/TEN (Lee etal. 2012; Morita etal. 2019). It has also been shown that prior exposure to corticosteroids is associated with a longer disease progression with no impact on mortality (Lee et al. 2012). Treatment with IVIg has produced conicting results (Firoz et al. 2012; Bachot et al. 2003; Chen etal. 2010; Lee et al. 2013; Huang et al.
2012). Pooled analysis of previously published
studies failed to show mortality benet, even if used in conjunction with corticosteroids (Schneck etal. 2008).
Ciclosporin, an anti-apoptotic agent which inhibits CD8+ T cells, was shown to limit disease progression after a short-term administration of 3–10 mg/kg (Valeyrie-Allanore et al. 2010). In our rst, open, single-centre trial on 29 patients, 3mg ciclosporin/kg/day resulted in the absence of observed death, whereas 2.75 deaths were pre­dicted by SCORTEN score, with control of epi­dermal detachment progression in 62% of patients. Other small retrospective studies have been performed with the same encouraging results. A Spanish study compared 26 patients treated with ciclosporin in a single burns unit with 16 patients not treated with this drug in another burns unit. The authors then pooled their results with those of ve previous case series. They found that ciclosporin decreased mortality by 60% (González-Herrada etal. 2017; Lee etal.
2017a). However, in our second, larger, single-
center retrospective study (of 174 patients) in which a propensity score method was used to compare patients receiving ciclosporin plus sup­portive care with those who received supportive care only, the initial encouraging results of ciclo­sporin were not conrmed, neither for reducing the mortality nor for improving the time to heal­ing (Poizeau etal. 2018).
In an Italian small case series, a single dose of etanercept (anti-TNF agent) was shown to provide quick healing of SJS/TEN within
8.5days (Paradisi etal. 2014). Another uncon­trolled prospective study in Taïwan compared etanercept with corticosteroids in 96 patients (60% of the study population had SJS) and reported a quicker healing time in the etanercept group; however, the mortality rate was similar (Wang et al. 2018). Previously, a randomized controlled trial had shown an unexpected higher rate of mortality with thalidomide, which has anti-TNF properties, than with placebo (Wolkenstein etal. 1998).
GM–CSF may have a therapeutic role in SJS/ TEN as preliminary data from two patients sug­gested that it had a positive effect on promoting epithelialization (de Sica-Chapman etal. 2010).
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9 Long-Term Follow-Up
After the acute phase, survivors of SJS/TEN are commonly troubled by chronic sequelae which have a signicant impact on quality of life (Yang et al. 2016; Lee et al. 2017b; Ingen-Housz-Oro etal. 2019) (see Table2).
The most frequent and disabling sequelae are
as follows
Cutaneous (Magina etal. 2003) Hypo/hyperpigmentation, dystrophic scars,
hypertrophic scars, photosensitivity, chronic pruritus, dysesthesia, nail dystrophy, telogen efuvium.
Ocular (Gueudry et al. 2009; Hajj et al. 2019;
Thorel etal. 2019; Tougeron-Brousseau etal.
2009)
Dry eyes, ocular pain, photophobia, eyelid and
conjunctival scarring causing trichiasis and symblepharon, corneal erosions and ulcers, neovascularization, loss of sight
Psychological (Hefez et al. 2018; Dodiuk-Gad
etal. 2016)
Fatigue, anxiety, depression, fear of drugs, post-
traumatic stress disorder.
Other sequelae include the following
Genital (Kaser etal. 2011) Scars, synechiae, pain, dyspareunia, impaired
normal vaginal delivery
Oral and dental (Sibaud et al. 2005; Gaultier
etal. 2009)
Chronic erosions of the tongue, sialadenitis, tooth
decay
Respiratory (Duong etal. 2015; Seccombe etal.
2019)
Asymptomatic alteration of diffusion capacity,
rarely bronchiolitis obliterans, especially in children
Regular multidisciplinary follow-up with the help of a psychologist and social worker is help­ful in reducing the impact of long-term sequelae (Ingen-Housz-Oro et al. 2018a; Ingen-Housz­Oro etal. 2019; Dodiuk-Gad etal. 2016).
10 Tests toIdentify
theCulpritDrug
No currently available test has sufcient sensitiv­ity and specicity to rule out a potential culprit drug when negative and thus permit rechallenge with zero risk of triggering further SJS/TEN. Intradermal tests and drug provocation tests are contraindicated in SJS/TEN.Patch testing is safe and best performed within 6months of the acute phase; however, this investigation has a low sen­sitivity in SJS/TEN (Barbaud et al. 2013; Wolkenstein etal. 1996). Thus, in the situation of negative patch tests all suspected drugs remain contraindicated (Bergmann and Caubet 2019; Phillips etal. 2019).
In vitro tests, which include lymphocyte­transformation test (LTT) or enzyme-linked immunospot assay (ELISPOT), are not available in routine practice in most centers. In SJS/TEN, these tests are of best value in the early stage of the disease (Kano etal. 2007; Srinoulprasert and Pichler 2014). However, LTT has a low sensitiv­ity in SJS/TEN when used alone (Tang et al.
2012). Other tests, such as granulysin expression,
granzyme B-ELISPOT, and IFNγ production, when used in combination may have a higher sensitivity and specicity (Kano et al. 2007; Srinoulprasert and Pichler 2014; Porebski etal.
2013).
11 Prevention ofSJS/TEN
Prevention of this life-threatening disorder is a major aim in the management of SJS/ TEN. Central to preventative strategies is the identication of individuals at high risk of SJS/ TEN. In many countries pharmacogenomic screening before the administration of HLA­associated drugs has been established for at-risk populations, a public health initiative which has signicantly reduced the incidence of SJS/ TEN. There is also a recognition that certain drugs which carry a high notoriety for SJS/TEN may be prescribed inappropriately. A key exam­ple is the use of allopurinol to manage asymp-
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tomatic hyperuricemia. It has been argued that this indication for allopurinol represents a high jeopardy prescribing practice and should, per­haps, be challenged. Other prescribing anomalies which can potentially cause SJS/TEN include the problem of similarities in drug nomenclature. Several SJS/TEN cases have been reported after erroneous dispensing of Lamictal (lamotrigine) instead of Lamisil (terbinane) (Cassius et al.
2019). Tackling aws in both drug prescribing
and drug dispensing offers a simple opportunity to lessen the risk of SJS/TEN.
Acknowledgments Prof. Nicolas de Prost, Prof. Pierre Wolkenstein, Mrs. Audrey Colin, patients’ association AMALYSTE.
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