acne - gpcme.co.nz · mild acne: treatment failure has the patient followed the treatment plan? add...
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Amanda Oakley Clinical Director, Department of Dermatology, Health Waikato
Clinical Associate Professor, Waikato Clinical School
Acne
GPCME, 9 June 2011
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This presentation Overview of acne Topical management Conventional oral therapies Role of isotretinoin When to refer
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What is acne? Folliculocentric inflammatory skin disease Characterised by polymorphic lesions Non-inflamed comedones, cysts Inflamed papules, pustules, nodules Secondary crusting, macules, scars
Face, neck, trunk and sometimes elsewhere
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Pathogenesis Androgenic stimulation for sebum production Hyperkeratinisation of hair follicle Colonisation of blocked follicle with Propionibacterium acnes Free fatty acids from sebum breakdown Proteases from bacteria Inflammatory cytokines targeting bacteria
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What is the role of diet? Remains controversial! Acne is rare in certain communities Western diet associated with higher rates of acne Inadequate studies indicate an association with milk and high
glycaemic foods Stone-age diet appears of modest benefit but difficult to
adhere to If the patient is interested in dietary measures, then
recommend low-dairy, low-glycaemic index diet
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Grading acne Grading scales available e.g., Leeds These relate to inflammatory lesions on face
Ask the patient! Clinically mild acne may have serious impact Clinically severe acne may not bother him/her
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Mild acne <30 lesions
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Moderate acne: 30-125 lesions
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Severe acne: >125 lesionsNodules, cysts, scars
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Acne grading scales
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Comedonal acne
Closed comedones Open comedones
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Inflammatory acne
Papulopustular acne Sandpaper acne
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Acne excorié
Hyperpigmentation Hypopigmentation
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Nodulocystic acne
Mixed lesions Nodules and cysts
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Acne conglobata
Draining sinuses Crusted sores
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Acne fulminans Severe inflammatory acne Fever, malaise Arthralgia, myalgia Bone pain Neutrophil leucocytosis
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Postinflammatory changes
Erythema - weeks Pigment - months
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Acne scarring
Ice pick Perifollicular elastolysis
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Acne scarring
Hypertrophic / keloidal Atrophic / boxcar
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Management: washing Wash face twice daily with non-soap non-greasy cleanser Examples: Cetaphil, Neutrogena, Sebamed, QV …
Consider cleanser containing salicyclic acid or benzoyl peroxide Examples: Neutrogena oil-free cleanser, Benzac Wash May cause irritant dermatitis
Role of cleansers containing antiseptic is uncertain (triclosan) Do not scrub, squeeze or pick spots
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Management: cosmetics Cosmetics should be non-comedogenic Sunscreens designed for facial use Powder or water-based foundation Avoid hair pomades
Apply moisturiser only if skin dry E.g. when provoked by treatment Choose non-oily, non-irritating product
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Global Alliance to Improve Outcomes Recommendations for management of acne 2003 Updated 2009
J Am Acad Dermatol 2009;60:S1-50.
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Mild acne: treatment - topicals first Topical retinoid Benzoyl peroxide Combined products Duac® Epiduo®
Salicylic acid Azelaic acid
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How to apply topical tx for acne Apply to entire affected area, sparingly at first If irritates: Wash off after 5 minutes; reapply tomorrow for one hour Apply alternate days Use hydrocortisone cream short-term Try alternate formulation Newer formulations may be better tolerated
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Topical retinoids Tretinoin ReTrieve® cream 50g 0.5mg/g PHARMAC fully funded from 1 July 2010
Retin-A® cream 20g Retinova® emollient cream 20g
Isotretinoin Isotrex® gel 30g
Adapalene Differin® gel, cream 30g PHARMAC fully funded from 1 October 2010
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Topical retinoids may cause irritant dermatitis: stinging, redness, dryness
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Mild acne: treatment failure Has the patient followed the treatment plan?
Add another topical Combination treatments effective, well tolerated but not
funded Adapalene or tretinoin + erythromycin or benzoyl peroxide
Isotretinoin if persistent, patient over 25 years, significant distress
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Moderate acne: treatment – add oral Topical retinoids +
benzoyl peroxide Oral antibiotic Doxycycline Others
OCP Combined Yasmin / Yaz Ginet-84 / Estelle 35 /
Diane-35
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Doxycycline Prescribe for 3 to 6 months Dose is usually 100 mg daily (range 50 to 200 mg) Take with glass water after meals, stay upright 30 minutes Warn re side effects: Oesophagitis Sunburn Thrush
Allergy is uncommon Warn that slow to be effective: maximum at 6-24 weeks
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Hormones Any combined ocp may be helpful Ethinyl oestrodiol/cyproterone acetate ?more effective Ethinyl oestrodiol/drospirenone ?better tolerated Progesterone not helpful & may aggravate acne Minipill Depo Provera® Mirena®
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Moderate acne: treatment failure Is the patient following the treatment plan?
Higher dose antibiotic In females, antibiotic + OCP
Isotretinoin if persistent, > 6 months tx, patient over 25 years, significant distress
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Severe acne treatment: refer Topical retinoid + benzoyl
peroxide may not be tolerated
Oral antibiotic high dose Contact the dermatologist! These are high priority
patients & will be seen quickly if your concern is communicated
Isotretinoin treatment mandatory but can be very tricky to manage!
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When to refer
Macrocomedones If you don’t feel confident to
prescribe isotretinoin If you haven’t read all the
resources
Macrocomedones Acne conglobata Acne fulminans Bad nodulocystic disease Children
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Risks in children
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Shared care Get to know your local dermatologist(s) Find out if he / she is comfortable with this idea
Dermatologist initiates treatment with isotretinoin Reviews after 3 months
When access difficult (geographic, financial), GP reviews and prescribes as required
Good communication required To manage mucocutaneous side effects To determine duration of therapy
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GP initiation of isotretinoin When criteria fulfilled Moderate or persistent acne Recurrent acne after previous successful course Failure or long duration of standard therapy GP self-assesses as adequately trained Use decision support tool if you like Males, or females-that-are-not-going-to-get-pregnant
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What is isotretinoin used for?
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What are its registered indications?
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Rules for Special Authority funding
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Training for GPs BMJ Learning BPAC article BPAC Decision support tool DermnetNZ
http://dermnetnz.org
Drug company informationhttp://www.oratane.co.nz
Medsafe data sheethttp://medsafe.govt.nz/profs/datasheet/o/oratanecap.pdf
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Gaining experience 4 years supervision for dermatology trainees No independent prescribing for 6 months All acne patients discussed with dermatologist Consultant applies for Special Authority
300 acne consults /12 mths at Waikato Hospital Most patients are prescribed isotretinoin
Equivalent training not achievable for GPs Could develop acne as a subspecialty interest if
>50 patients per year
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Prior to treatment Prolonged consultation with patient Assess type, severity & extent of acne Provide written material about isotretinoin Discuss & arrange contraception for females Assess mental status & record in notes Arrange blood tests: CBC, LFT, lipids, beta-HCG Apply for Special Authority funding
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Obtain consent Discuss birth control Discuss depression
http://www.oratane.co.nz/
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Don’t use isotretinoin if: Pregnancy test positive Unmanaged depression Unexpected systemic disease E.g. infectious mononucleosis
Hypertriglyceridaemia >6 mmol/L Uncontrolled eczema / dry eyes / nosebleeds etc Patient is a pilot – contact Civil Aviation Authority
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When to follow up? One to three months Consider: Patient’s character Acne severity Comorbidities
Always provide a phone number and see patient face to face if there are any concerns
Train nurse to field calls
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What dose? 0.1 to 1 mg/kg/day 5 – 60 mg/day for 60kg adult
Low doses are often effective Start 10-20 mg/day and build up if required Tolerance varies
Higher doses advocated by many Quicker results Higher long term cure rates Reduced pregnancy-risk
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For how long? 100-150 mg/kg 125 days at 1 mg/kg 1250 days at 0.1 mg/kg 20-30% relapse
Individualise Until clearance + some Stop and start again if
necessary Long term in adult acne
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Additional treatment Contraception Antibiotics if very inflammatory Not tetracyclines Erythromycin / trimethoprim
Emollients
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Acne getting better Great ! Keep dose same Reduce dose or frequency Eventually stop …
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Acne unchanged Why? Noncompliance Underlying cause
Keep dose same: patience! Increase dose: quicker
response
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Acne getting worse Why? Underlying cause Herxheimer response
Reduce dose or stop Add antibiotic Call for help May require systemic
steroids
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Dry or cracked lips Lip balm ++ Sunscreen Don’t lick Topical antibiotic to angles
of mouth & nostrils: 7-day course
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Dry or watery eyes Wrap-around sunglasses
outdoors Reduce wearing contact
lenses Artificial tears Ocular lubricant eg Poly-
Tears™
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Dry and sensitive skin Soapless cleanser Regular emollient at least
bd Careful sun protection Don’t wax For retinoid dermatitis:
mild topical steroid for a few days
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Muscles, joints and fatigue Mild – reassure Moderate – reduce dose Sometimes, reduce exercise
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Headache Mild: drink more fluids; may take paracetamol Moderate: reduce dose Severe: examine for papilloedema & stop isotretinoin Ensure patient is not taking additional vitamin A or
tetracycline
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Contraception Combined ocp or IM progesterone + condoms IUD, Mirena + condoms Vasectomy / tubal ligation Abstention
Not minipill (progesterone-only) reduced efficacy
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Depression Grumpiness & tiredness common in isotretinoin patients Depression usually pre-existing or due to other causes Stop isotretinoin if any doubt – try again later Treat depression as you would normally
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What to do if … eczema Treat eczema first No soap Thick emollients Topical steroids Antibiotic if necessary
Warn patient will require more emollient and skin will be more sensitive
Eczema is sometimes BETTER on isotretinoin because of its immunosuppressive action
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What to do if … Staph infection Topical antiseptic if mild
and localised Topical antibiotic if
moderate and localised Flucloxacillin if required
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What to do if … drives at night Warn that some individuals
lose night vision as retinoids interfere with rods
Some people have to make a choice: isotretinoin or driving
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Relapse Start again Consider options Most patients will choose another course of isotretinoin but
some prefer topicals and a few want antibiotics
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Long term treatment Required for Adult acne – mainly women Seborrhoea Follicular occlusion syndrome Dysmorphophobia
Adjust dose to minimum Re-evaluate every ?6 months Blood tests if risk factors for complications