Z Score,T Score, Percential Rank and Box Plot Graph
Lyell's syndrome or Toxic epidermal necrolysis
1. Name : Francis Sharon Jessy
Group : 12
Topic : Lyell’s Syndrome
Teacher: Pazylova Baktigul
2. DEFINITION
• Definition:
• Toxic epidermal necrolysis (TEN), also known as Lyell's syndrome,
is a rare, life-threatening skin condition that is usually caused by a
reaction to drugs. The disease causes the top layer of skin
(the epidermis ) to detach from the lower layers of the skin (the dermis),
all over the body, leaving the body susceptible to severe infection.
►morbilliform type: most common
► symmetrical, erythematous rash, macules & papules, lasts few days
► can proceed to serious cutaneous reactions:
► serum sickness
► hypersensitivity syndrome
► T.E.N
4. ► Adverse drug reaction
► over 100 drugs implicated
Commonest Causative Drugs
Sulphonamide antibiotics
Anticonvulsants
NSAIDs
Allopurinol
Corticosteroids
Newest Causative Drugs
Nevirapine (antiretroviral)
Lamatrogine
► Other causes:
► immunisations; bone marrow transplants; solid organ transplants
5. ► Prodromal phase; 1 – 14 days
► flu-like symptoms
► Inflammation:
► eyelids
► conjunctiva
► Tenderness:
► oral mucosa
► general cutaneous
► Generalised macular erythma:
► progresses to flaccid blisters and bullae
► join to form large bullae
► large areas of epidermis are “sloughed off”
► Mucous membranes often involved
► usually 1-3 days earlier then skin lesions
► eyes; oropharynx; respiratory tract; GI tract; genital tract; anus
Rapid progression over days. 10 – 100% of body’s surface area involved.
Discomfort
Pain
Fever
Sore throat
Cough
Malaise
6. Differential Diagnosis of T.E.N.
Burns
Conjunctivitis
Ulcerative keratitis
Staphylococal Scalded Skin Syndrome
Stevens-Johnson Syndrome (S.J.S.)
Toxic Shock Syndrome
Exfoliative dermatitis
Erythema multiforme
Pemphigus
S.J.S. and T.E.N. Are very similar in cause, severity, clinical features and
variability. They only really differ in the extend of skin detachment and mortality
both being larger in T.E.N.
7. ► MICROBIOLOGY
► blood culture
► MSU
► swabs; including MRSA screening swabs
► GENERAL
► FBC
► ESR
► U&E and creatinine
► LFTs
► Albumin
► Glucose
► Calcium
► CRP
► Urine dipstick (protein & blood)
► IF INDICATED
► coagulation studies
► CXR
8. ► MAINLY SUPPORTIVE
► discontinue causative drug
► burns unit
► skin care; protect skin from infection
► monitor fluid and electrolyte balance
► nutritional support
► analgesics (may need oral/iv morphine)
► eye care; lubrication with chloramphenicol
► SCORTEN assessment
