common allergy update 2001
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Common AllergyCommon Allergy Update 2001 Update 2001
Asst. Prof. Kiat Ruxrungtham, M.D.Asst. Prof. Kiat Ruxrungtham, M.D.Division of Allergy and Clinical ImmunologyDivision of Allergy and Clinical Immunology
Department of MedicineDepartment of MedicineFaculty of MedicineFaculty of Medicine
Chulalongkorn UniversityChulalongkorn University
โรคภมแพทพบบอยโรคภมแพทพบบอย โรคภมแพทางจมก โรคภมแพทางจมก Allergic Allergic
RhinitisRhinitis โรคหดจากภมแพ โรคหดจากภมแพ Allergic Asthma Allergic Asthma โรคภมแพทางผวหนง โรคภมแพทางผวหนง Atopic Atopic
DermatitisDermatitis โรคลมพษโรคลมพษ UrticariaUrticaria โรคโรค แพอาหาร แพอาหาร Food AllergyFood Allergy การการแพยาแพยา Drug AllergyDrug Allergy
Allergy Chula 1999
Epidemiology of Allergic Diseasesin Thai Children
13
17.9
404.2
13
0 10 20 30 40
Prevalence (%)
AtopicDermatitis
AllergicRhinitis
Asthma1990 1995
พยนต บญญฤทธพงษ และมนตร ตจนดา 2533; ปกต วชยานนท และคณะ 2541
Mediators of Mast Cells and BasophilsMediators of Mast Cells and Basophils
Histamine
Tryptase
Chymotryptase
Heparin/Chondroitin
Kininogenase
Chemotactic Factors
ProstaglandinsLeukotrienes
PAFHistamine RFs
IL-3, 4, 5, 6, 7, 8GM-CSF, TNF
Chemokines -MCP1, MIP1
Oxygen radicals
Primary MediatorsPrimary Mediators Secondary MediatorsSecondary Mediators
Sim TC, Grant JA 1996 AllergyChula
Mediators of Mast Cells and Allergy
Mast CellMast CellBasophilBasophil
Blood VesselsBlood Vessels
Smooth MusclesSmooth Muscles
Mucus GlandsMucus Glands
Sensory NervesSensory Nerves
LeukocytesLeukocytes
H, PGDH, PGD22, , LTs, PAFLTs, PAF
bradykininbradykinin
HH
H, PGDH, PGD22, , LTs, PAFLTs, PAF
LTB4LTB4PAFPAFIL3, IL5IL3, IL5ChemokinesChemokines
Urticaria, AngioedemaUrticaria, AngioedemaLaryngeal edema, ShockLaryngeal edema, Shock
BronchospasmBronchospasmAbd. pain, VomitingAbd. pain, Vomiting
Diarrhea, RhinorheaDiarrhea, RhinorheaBronchial secretionBronchial secretion
ItchingItching
Inflammation - LPAR Inflammation - LPAR
AllergyChula
Pathogenesis of Allergic DiseasePathogenesis of Allergic Disease
Genetic SusceptibilityGenetic Susceptibility
Allergic SensitzationAllergic Sensitzation
Upper/lower airway or SkinUpper/lower airway or Skinhyperresponsiveness hyperresponsiveness
Allergic DiseasesAllergic Diseases
Allergen Exposure
Adjuvant factors:• Tobacco smoke• Air pollutants
Lack of protective factors:• Infection ?• Immunization ?• Nutrition ?
PollutantsInfectionExcercise
Modified from Ulrich Wahn 1998
Vary in spectrum Vary in spectrum and severityand severity
Principle Pathogenesis of Allergic Diseases Principle Pathogenesis of Allergic Diseases
Th-2Th-1
IL-12
IFN-IL-5IL-3GM-CSF
Eosonophil
Mastcell
IL-4 IgE
B-cell
APCAllergen
CD4+ T-cell
Late Phase Reaction
_ +
IgG
Durham and Till 1998, Lu 1998, Drazen 1996
CD8+ cell
AllergyChula
IL-5
B-cell
Allergen
Tryptase, LTs
MBPECP, LTs
Other cells
The Respiratory TractThe Respiratory TractUpper Respiratory Tract Structures - Nose —> trachea - Sinuses, eustachian tubes - Ciliated mucosal lining
Functions - Conditioning the air - Defense
FiltrationInflammatory reactionImmune reaction
- Smell - Voice
Lower Respiratory Tract Structures - Trachea —> alveoli
Functions - Inhalation-exhalation - Gas exchange - Acid-base balance
Co-existence of Asthma and ARCo-existence of Asthma and AR
306 former students 306 former students with with Allergic RhinitisAllergic Rhinitis
84 former students 84 former students with with AsthmaAsthma
AsthmaAsthma
nono ARAR
nono
Greisner WA et al Allergy Asthma Proc 1998; 19:185-8
86 %86 %79 %79 %
21 %21 %
23-Years Follow-up Study of Former Brown University Students (N=738)
Ragweed Hay Fever with Seasonal AsthmaRagweed Hay Fever with Seasonal AsthmaUpper-Lower Airway Linked
PlaceboPlacebo
Welsh et al. Mayo Clin Proc 1987;62:125-34
AR in Patients with Mild AsthmaAR in Patients with Mild AsthmaTreatment with intranasal corticosteroids :Treatment with intranasal corticosteroids :
Effect on lower airway responsiveness
0
1
2
3
4
PC20
Met
hach
olin
e (m
g/m
L)
Baseline Intranasal BDP PlaceboAt 4 Weeks of Treatment
Baseline Intranasal BDP PlaceboP =0.04
Watson WTA et al J Allergy Clin Immunol 1993; 91:97-101 AllergyChula
Mean Changes in FEV1 (Litre)Mean Changes in FEV1 (Litre)in Treated AR with Mild Asthmain Treated AR with Mild Asthma
00.050.1
0.150.2
0.25
Wk 1 Wk 2 Wk 4 Wk 6
Loratadine/Pseudoephredine Placebo
Corren J, et al J Allergy Clin Immuno 1997; Corren J, et al J Allergy Clin Immuno 1997; 100:781-788100:781-788
Morning (AM)
**
* P=0.01
***<0.05
Ideal AntihistaminesIdeal AntihistaminesSafety No CNS toxicity No cardiotoxicity
Pharmacology• Specific H1 receptor blockade• Additional potent anti-allergic/anti-
inflammatory effects• Rapid onset of action• Long-acting• No-tachyphylaxis• No drug interaction• No dose-adjustment required in
special-risk groups
Simons FE EAACI 1998 AllergyChula
PK and PD : Second-Third generation AntihistaminesPK and PD : Second-Third generation Antihistamines
Drug Metabolism T1/2 (h)* Onset Peak Duration
Terfenadine Liver 16-24 1-2 h 3-4 h 8-12 h
Astemizole Liver 9.5 days 2 day 9-12d weeks
Loratadine Liver 17-24 >1 h 4-8 h 24 h
Cetirizine no (Kidney) 25 1 h 4-8 h 24 h
Fexofenadine minimal 14.4 1 h 2-3 h 24 h
-Inhibition of Histamine wheal/flare -Inhibition of Histamine wheal/flare
Kaliner M. Clin Geriatrics 1997; Simons FE, NEJM 1994Kaliner M. Clin Geriatrics 1997; Simons FE, NEJM 1994AllergyChulaAllergyChula
H1-Antagonists and Drug Interaction
First-generation H1-AntagonistsFirst-generation H1-Antagonists Potentiation of SedationPotentiation of Sedation : : Alcohol, sedative agents, hypnotics, antidepr Alcohol, sedative agents, hypnotics, antidepr
essantsessants Potentiation of anticholinergicPotentiation of anticholinergic effect:effect: Antidepressants Antidepressants
Second-generation H1-AntagonistsSecond-generation H1-Antagonists (Terfenadine, astemizole, ebastine-animal model , but not loratadine)(Terfenadine, astemizole, ebastine-animal model , but not loratadine)
Decrease hepatic metabolism and increase risk of cardiotoxicity:Decrease hepatic metabolism and increase risk of cardiotoxicity: Drugs that inhibit cytochrome p450 : Ketoconazole, macrolides-erythromyDrugs that inhibit cytochrome p450 : Ketoconazole, macrolides-erythromy
cin, other azoles- itraconazolecin, other azoles- itraconazole Drugs that prolong QTDrugs that prolong QT : quinidine : quinidine
Third-generation H1-AntagonistsThird-generation H1-Antagonists (Cetirizine, Fexofenadine)(Cetirizine, Fexofenadine) No clinical significant in drug interaction No clinical significant in drug interaction
AllergyChula
Antihistamines in Elderly• Drawsiness, fatigue and may increase risk falling or a
ccident• The first-generation H1 antagonist should be avoided
in patient with glaucoma• The first-generation H1 antagonist should also be avo
ided in patient with prostrate hypertrophy• Be aware of cardiotoxic risk; terfenadine, astemizole
should be used with caution
AllergyChula
Treatment of Allergic Rhinitis in AdultsTreatment of Allergic Rhinitis in Adults
Allergy Immunol Clinic 2000
Drug Itch/sneezing
Rhinorrhea Blockage Anosmia
Antihistamines +++ ++ + -Topical CS +++ +++ ++/+++ +/++
Oral CS +++ +++ +++ ++/+++
Topicaldecongestants
- - +++ -
Ipratropiumbromide
- +++ - -
Sodiumcromoclycate
+ + + -
เยอจมกบวมใน โรคภมแพ เยอจมกบวมใน โรคภมแพทางจมกทางจมก
Allergy Chula 1999
Characteristics of Antihistamines
AllergyChula
H1 Antagonist H1 Antagonist +++ +++ ++++++
Anticholinergic Anticholinergic +++ +++ -- ((Cetirizine -dry mouth)Cetirizine -dry mouth)
Sedation Sedation ++/+++ ++/+++ -- (Cetirizine +/-)(Cetirizine +/-)
Duration of Action Duration of Action +/++ +/++ ++/+++++/+++ (Astemizole-longest)(Astemizole-longest)
Antiallergic Antiallergic -/+ -/+ -/++-/++ (Azelastine)(Azelastine)
AntiinflammatoryAntiinflammatory - - -/+-/+ (Clinical ?)(Clinical ?) (Citirizine, Loratadine(Citirizine, Loratadine
Fexofenadine)Fexofenadine)
CharacteristicsCharacteristics First First Second/Third Generation Second/Third Generation
Adverse Effects of H1-Antagonists
Adverse Effects CPM HZ TF ASZ LD CZ FX
Sedation + ++ - - - -/+ -
Appetite stim. - -/+ - -/++ - -/+ -
Weight gain - -/+ - -/++ - -/+ -
Dry mouth ++ + - - - -/+ -
Prolong QTc -/ ? -/ ? +* +* - - -
Torsade de Points - - +* +* - - -
AllergyChula
Effects of fexofenadine, diphenhydramine, and alcohol on Effects of fexofenadine, diphenhydramine, and alcohol on driving performance: in the Iowa driving simulatordriving performance: in the Iowa driving simulator
Overall driving performance• Fexofenadine = placebo• Alcohol >placebo• Diphenhydramine > alcohol• Drowsiness ratings were not a good predictor of impairm
ent• suggesting: drivers cannot use drowsiness to indicate wh
en they should not drive.
Weiler JM et al. Ann Intern Med 2000 Mar 7;132(5):354-63
AllergyChula
Sedation with "non-sedating” antihistamines: four prescription-event monitoring studies in general practice
N= a total of 43 363 patients: Drowsiness The Odd Ratio P value(versus Loratadine)
Fexofenadine 0.63 (0.36-1.11) 0.1Acrivastine 2.79 (1.69-4.58) <0.0001Cetirizine 3.53 (2.07-5.42) <0.0001
No increased risk of accident or injury was evident with any of the four drugs.
Mann RD, et al. BMJ 2000 Apr 29;320(7243):1184-1187
Antihistamines in Elderly
• Drawsiness, fatigue and may increase risk falling or accident
• The first-generation H1 antagonist should be avoided in patient with glaucoma
• The first-generation H1 antagonist should also be avoided in patient with prostrate hypertrophy
• Be aware of cardiotoxic risk; terfenadine, astemizole should be used with caution
AllergyChula
Anti-H1 and Anti-inflammation
Antihistamine Evidence-based In Vitro In Vivo (DPCT)(positive results/total)
Loratadine yes1/3
Cetirizine yes3/5
Terfenadineyes1/1
Fexofenadine yesnd
AllergyChula
GINA guidelines 1998Focus on ICS and ß2-agonists
Short-acting ßShort-acting ß2 2 prnprn
Inhaled corticosteroidsInhaled corticosteroids
Long-acting ßLong-acting ß22
J Bousquet Berlin 1999
IntermittentMild
persistentModerate persistent
Severepersistent
Theophylline: Plasma concentrationsClinical Efficacy in Chronic Asthma as a monClinical Efficacy in Chronic Asthma as a mon
otherapy : otherapy : – 10-20 10-20 g/mlg/ml
Anti-inflammatory, Immunomodulatory : Anti-inflammatory, Immunomodulatory : – >5-10 >5-10 g/mlg/ml
Food and Drug InteractionFood and Drug Interaction• Increase clearance: Increase clearance: anticonvalsants (phenobarbitanticonvalsants (phenobarbit
al, phynytoin,carbamazepine), rifampicinal, phynytoin,carbamazepine), rifampicin• Decrease clearnace: Decrease clearnace: alcohol, antibiotics (erythroalcohol, antibiotics (erythro
mycin, clarithromycin, ciprofloxacin), cimetidinemycin, clarithromycin, ciprofloxacin), cimetidine
AllergyChula
Theophylline as an Add On Regimen (1)
412
402
360
380
400
420
440
Week 0 Week 3 Week 6 Week 9 Week 12
Mea
n M
orni
ng P
EF (L
/min
)
Low dose Bud + Theo Low dose High dose + Placebo
Evans DJ, et al N Engl J Med 1997; 13:1412-8
NS
N=31 per group
Budesonide: Low dose =400, High dose=800 BID** (**Decreased cortisol level)Theophylline: Low dose =250 mg BID (BW<80 kg) or =375 mg BID (BW>80)
*Median serum Theophylline =8.7 mg/ml
Theophylline as an Add On Regimen Theophylline as an Add On Regimen (2)(2)
0100200300400500
Mea
n A
M P
EF
(L/m
in)
Beclo 200 bid +Theophylline
Beclo 400 bid +Placebo
Week 0 Week 6
Ukena et al Eur Respir J 19971997; 10:2754-60
P<0.01P<0.01P=ns
N= 69 N= 64
Pathogenesis of Allergy and Asthma and Potential Novel Therapy
LeukotrienesPGD2
Histamine
TryptasePAF
Bronchoconstrictionand Mucus Secretion
Chemotaxis
EotaxinRANTES
MCP4Airway HyperreactivityAirway Hyperreactivity
T-Helper CellsT-Helper CellsTh2Th2
IL-5
IL-4B CellsB Cells
IgE
Eosinophil Recruitment and Production
Anti--IL-4 AbAnti--IL-4 AbIFNIFN (Th1) (Th1)
Anti--IL-5 AbAnti--IL-5 Ab
Anti--leukotrienes Anti--leukotrienes ZileutonZileuton ZafirlukastZafirlukast MontelukastMontelukastMast cell
Tryptase inhibitorTryptase inhibitorAnti-PAFAnti-PAF
IFNIFN (Th1 switch) (Th1 switch)
Eosinophil
InflammationInflammation
Future OptionsFuture OptionsPhosphodiesterase 4 (PDE-4) inhibitorsPhosphodiesterase 4 (PDE-4) inhibitors• TheophyllineTheophylline is a non-selective PDE-4 inhibis a non-selective PDE-4 inhib
itoritor• Selective inhibitorsSelective inhibitors:: CDP840, KF 19514, CDP840, KF 19514,
CP80, 633CP80, 633– Increase intracellular c-AMPIncrease intracellular c-AMP– Decreased eosinophil survival (IL-5 induced)Decreased eosinophil survival (IL-5 induced)– Decreeased IL-4, IL-13 production Decreeased IL-4, IL-13 production
Momose T 1998, Faissier L 1996, Shichijo M 1997
สงแวดลอม กบ โรคภมแพ
ตวไรฝนตวไรฝน ทกกฝนทกกฝนเกสรเกสร
ฝนบานฝนบาน เชอราเชอราฝนบนอนฝนบนอน สตวสตวเลยงเลยง
อาหารอาหาร
สงเหลานมอยรอบตวเรา มทงในบานและนอกบาน แตมหลายอยางทเราหลกเลยงได หากเรารวธทถกตอง
การจดหองนอนใหปลอดไรฝน
หมอน ควรใชใยสงเคราะห และหมดวยผาไวนลหรอ ผาใย สงเคราะหพเศษ และไมใชนน หรอขนนก ตากแดด ทก - 12 สปดาห ทนอน ควรหมดวยผาสงเคราะหทปองกนไรฝนได ตากแดด
ทก - 12 สปดาหผาหม ควรทำาจากใยสงเคราะหหรอผาแพรการทำาความสะอาด ซกเครองนอนตางๆดวยนำาอน55( 0 C ) ทก - 12 สปดาห
เฟอรนเจอร มเฟอรนเจอรเทาทจำาเปน ควรใชวสดททำาความสะอาดงาย
เชน ไม บหนงแทหรอเทยม ไมควรบผา
พนหอง ไมควรปพรมมาน ไมควรใชผามานเพราะกกฝน ควรใชมลแทน เพราะทำาความสะอาดงาย
ควนบหรควนธป
Principles of Allergen ImmunotherapyPrinciples of Allergen Immunotherapy
AllergyChula
Induction Maintenance Phase
Allergen IT: LiteratureSearched
31by Tittle Words in IGM ( 1998Oct )
407
143
64
4
21
16
3
1
1
0 100 200 300 400
Venom
Pollen
Ragweed
HDM
Cat
Dog
Mold
Cock
Food
AllergyChula
Efficacy of Venom Immunotherapy (VIT)Efficacy of Venom Immunotherapy (VIT)(Protection from systemic reaction to the insect stings)(Protection from systemic reaction to the insect stings)
0 25 50 75 100
Hunt 1978
Gillman1980
Golden 1981
Reisman 1986
Mosbach 1986
Muller 1992(Bee)
Muller 1992(wasp)
% Efficcacy% EfficcacyAllergyChula
Clinical Efficacy of AIT in Allergic Rhinitis
(41 DBPC trials as by October 1998)
17
2
12
23
13
10
5
10
15
20
No.
of s
tudy
GrassPollen
Ragweed Tree HDM
Yes No
AllergyChula
Indications of Allergen Immunotherapy
• Insect sting allergyInsect sting allergy Systemic reaction (absolute indication)Systemic reaction (absolute indication)
• Allergic rhinitis*Allergic rhinitis*• Allergic asthma*Allergic asthma* (PFT >70% pred. value)(PFT >70% pred. value)
AllergyChula
**Dissatisfactory with avoidance + pharmacotherapyDissatisfactory with avoidance + pharmacotherapy
Allergen Immunotherapy not proven effective in:
• Atopic DermatitisAtopic Dermatitis• Food AllergyFood Allergy
• Chronic UrticariaChronic Urticaria
AllergyChula
Pathogenesis of Allergy and Asthma and Potential Novel Therapy
LeukotrienesPGD2
Histamine
TryptasePAF
Bronchoconstrictionand Mucus Secretion
Chemotaxis
EotaxinRANTES
MCP4Airway HyperreactivityAirway Hyperreactivity
T-Helper CellsT-Helper CellsTh2Th2
IL-5
IL-4B CellsB Cells
IgE
Eosinophil Recruitment and Production
Anti--IL-4 AbAnti--IL-4 AbIFNIFN (Th1) (Th1)
Anti--IL-5 AbAnti--IL-5 Ab
Anti--leukotrienes Anti--leukotrienes ZileutonZileuton ZafirlukastZafirlukast MontelukastMontelukastMast cell
Tryptase inhibitorTryptase inhibitorAnti-PAFAnti-PAF
IFNIFN (Th1 switch) (Th1 switch)
Eosinophil
InflammationInflammation
Factors Affecting Clinical OutcomesFactors Affecting Clinical Outcomes of Allergic Diseases of Allergic Diseases
AllergyChula
Enivronmental• Allergens• Irritants• Westernization
Infection• Viral• Bacterial
Treatment• Anti-inflammatory• Anti-allergic• Relievers
Compliance• Avoidance• Medication uses
Allergic DiseasesAllergic Diseases
Remission ModerateMild Severe
Allergen Immunotherapy
Genetic Degree of atopy
Future Therapy
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