oral food challenge - up to date - dspap
TRANSCRIPT
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Oral food challenge -Up to datePhilippe Eigenmann
University Children’s Hospital, Geneva CH
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Food challenges belong to the stone age!
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Sampson HA et al. J Allergy Clin Immunol 2001: 107: 891-6
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Authors Sampson (JACI 2001)
Boyano Martinez et al.
(CEA 2001)
Osterballe and Bindslev-Jensen (JACI
2003)
Celik-Bilgili et al. (CEA
2005)
Benhamouet al. (PAI
2008)
Study subject number
100 81 56 501 51
Presence of atopic dermatitis
61% 43% 100% 88% no
Age of study subjects
Median 3.8 yrs. (range 3 mo.
to14 yrs.)
Mean 16 mo. (range 11 to 24
mo.)
Median 2.2 yrs. (range 0.5 to
4.9 yrs.)
Median 13 mo. (range 1 mo. to 16.1 yrs.)
Median 3.9 yrs. (range 16 mo. To 11.9 yrs.)
CAP FEIATM cut off points for egg allergy (in kU/L)
(95%)7
(90%)0.35
(95%)1.5
(95%)12.6
(90%)8.20
CAP FEIATM cut off points for milk allergy in (kU/L)
(95%)15
n.a. n.a. (95%)88
n.a.
IgE cut-off levels for egg and milk allergy
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Food allergy diagnosis:Back to the kitchen
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Food challenge, when?
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The diagnosis is uncertain when:
IgE values are in the gray zone
IgE values do not correlate with the history
history not suggestive of foodallergy
For the diagnosis
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Sampson HA et al. J Allergy Clin Immunol 2001: 107: 891-6
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The probability of outgrowing foodallergy:
spIgE modification over time
For follow-ups
Shek LP et al. J Allergy Clin Immunol. 2004;114:387-91
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Probability of outgrowing:
lower spIgEprimary avoidanceno recent reaction
For follow-ups
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Food challenge tests- The gaps -
Improving protocols
Defining the risk for severe reactions
Improving indications
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Retrospective analysis of 100 most recent peanutchallenges done in a clinical setting at St Thomas’ (London) and Geneva/Lausanne (CH)
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When you do a food challenge:
Aim for a total dose corresponding to a servingNo need for « lip testing »Set your % of positive challengesExchange your experience with colleagues
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AAAAI – EAACI PractallStandardizing Double-blind Placebo-controlled
Oral Food Challenges
Hugh A Sampson, MD; Roy Gerth van Wijk, MD; Carsten Bindslev-Jensen, MD, PhD; Scott Sicherer, MD, Suzanne Teuber; MD and A Wesley Burks, MD; Andre Dubois, MD; Kirsten Beyer, MD; Philippe A. Eigenmann, MD;
Jonathan M. Spergel, MD, PhD; Thomas Werfel, MD; and Vernon M. Chinchilli, PhD
J Allergy Clin Immunol, 2012 Dec;130(6):1260-74.
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Subjective Symptoms
-General non-specific pruritus
-Scratching
-Nasal pruritus
-Ocular pruritus
-Dyspnea (without objective signs)
-Throat “tightness”
-Nausea
-Abdominal pain
-Oral/throat pruritus
-Complaints of weakness, dizziness, not
feeling well, etc.
SCORING THE CHALLENGE
J Allergy Clin Immunol, 2012 Dec;130(6):1260-74.
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GREEN: - Not usually an indication to alter dosing. -Not generally sufficient to consider a challenge positive.
ORANGE (scores increasing to orange): - Caution, dosing could proceed, be delayed, have a dose repeated rather than escalated.- If clinically indicated, dosing is stopped.- Symptoms that recur on 3 doses, or persist (e.g., 40 minutes) are more likely indicative of a reaction than when such symptoms are transient and not reproducible. -3 or more scoring areas in yellow more likely represent a true response.
RED:- Objective symptoms likely to indicate a true reaction- Usually an indication to stop dosing.
J Allergy Clin Immunol, 2012 Dec;130(6):1260-74.
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I. SKIN: A. Erythematous Rash- % area involved______
B. Pruritus 0 = Absent1 = Mild, occasional scratching2 = Moderate -scratching continuously for > 2 minutes at a time3 = Severe – hard continuous scratching – excoriations
C. Urticaria/Angioedema0 = Absent1 = Mild – < 3 hives, or mild lip edema2 = Moderate - < 10 hives but >3, or significant lip or face edema3 = Severe – generalized involvement
D. Rash0 = Absent1 = Mild – few areas of faint erythema 2 = Moderate – areas of erythema3 = Severe – generalized marked erythema (>50%)
J Allergy Clin Immunol, 2012 Dec;130(6):1260-74.
Message: Use standardized criteria for challenge interpretation
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Proportion of placebo reactions by organ
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Message: Consider DBPCFCs in young children with AE
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Food challenge tests- The gaps -
Improving protocols
Defining the risk for severe reactions
Improving indications
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Are there threshold doses?
A few examples from the literature
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Threshold doses to peanut in 286 French patients
Taylor SL et al Food ChemTox 2010;48:814-9.
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Flinterman et al Clin Exp Allergy 2002;32:157
Threshold doses for hazelnut
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Threshold doses for eggs
Osterballe et Bindslev-Jensen. J Allergy Clin Immunol 2003;112:196
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Osterballe et Bindslev-Jensen. J Allergy Clin Immunol 2003;112:196
Threshold doses for eggs
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Threshold doses in Dutch children to 5 foods
Bloom MW et al JACI 2013;131:172-9.
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Yes, there are threshold dosesbut!
they are: -patient/population-related-often with a large variation between subjective and objective
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Hourihane et Knulst Toxicol Applied Pharmacol 2005;207:S152
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Facets of risk acceptance and risk rejection
Google: ILO risk acceptancehttp://www.ilo.org/oshenc/part-viii/safety-policy-and-leadership/item/987-risk-acceptace
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-Culture-Economic
situation-Risk
communication
-Statisticalinformation
-Media information
-Expert estimates-Cost/benefitestimate
-Personalityaspects
-Risk motivation-Stress management
Google: ILO risk acceptancehttp://www.ilo.org/oshenc/part-viii/safety-policy-and-leadership/item/987-risk-acceptace
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Persisting food alergies (peanuts, nuts, fish…).Patient/Family anxiety.To demonstrate that first symptomsare not always life-threatening (e.g. oral prurit).
Indications to determine a thershold level-patient related-
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Cost-risk analysisBetter labellingFor improvement of "patient/industry " relationship.
Indications to determine a thershold level-industry related-
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Method: - Repeated DBPCFC peanut challenge,
med interval 14 days (7 – 126)
- 5 doses (0.001-0.01-0.1-1.0-5.0 g)
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Message: Be careful by determining threshold doses for reactions, they might not be definite.
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Key messages
The majority of our food allergic patients do not react to traces.We do not do routine threshold studies.Consider determining thresholds in severeallergics or chronic patients.Threshold determination should be done in well trained centers.
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Safety first!
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Your StaffThe locationEmergency medsIV line?
1. Key point for safety
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Yoneyama et al. Ann Allergy Asthma Immunol 115 (2015) 244e255
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Food challenge tests- The gaps -
Improving protocols
Defining the risk for severe reactions
Improving indications
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What happens at home?
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n=102Questionnaires send
n=73Valid questionnaires
received*
n=29Questionnaires not returned or invalid despite two additional attempts to contact family by
phone or mail
n=18Food not reintroduced-avoid the food (n=7)-never eat the food (n=4)-do not like the food (n=7)
n=53Food reintroduced-in "large" amounts (n=4)-in "normal" amounts (n=35)-occasionally (n=14)
25%
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Why is the foodnot introcused?
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Van der Valk JPM et al. Eur J Pediatr (2015) 174:1093–1099
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