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Come si dovrebbe fare e valutare il Test di Provocazione ... - RIAP

Come si dovrebbe fare e valutare il Test di Provocazione ... - RIAP

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TEST DI PROVOCAZIONE ORALE PER ALIMENTI<br />

14<br />

anche quelli <strong>di</strong> nuova generazione (cetirizina, lorata<strong>di</strong>na,<br />

ecc). Se nel corso della reazione allergica<br />

<strong>si</strong> sono manifestati <strong>si</strong>ntomi gastrointestinali sarà da<br />

preferir<strong>si</strong> la via <strong>di</strong> somministrazione intramuscolare (ad<br />

esempio <strong>di</strong>fenidramina alla dose <strong>di</strong> 1,5-2 mg/kg, dose<br />

mas<strong>si</strong>ma da somministrare 50 mg), in caso contrario,<br />

gli antistaminici potranno essere somministrati per os.<br />

La stessa dose del farmaco può essere ripetuta per via<br />

intramuscolare nel caso in cui insorga vomito entro 30<br />

minuti dall’assunzione orale. La loro somministrazione<br />

può essere con<strong>si</strong>gliata anche per i tre giorni succes<strong>si</strong>vi<br />

all’episo<strong>di</strong>o anafi lattico 114 .<br />

Quando invece insorgano <strong>si</strong>ntomi <strong>di</strong> interessamento<br />

del laringe, come tosse secca e abbaiante o stridore,<br />

può essere somministrata della adrenalina per via<br />

aerosolica 62 . La sua somministrazione tuttavia non <strong>dovrebbe</strong><br />

sostituire la somministrazione <strong>di</strong> adrenalina per<br />

via IM, laddove necessaria, come nel caso <strong>di</strong> interessamento<br />

delle basse vie respiratorie o <strong>di</strong> compromis<strong>si</strong>one<br />

car<strong>di</strong>ovascolare (ipoten<strong>si</strong>one, bra<strong>di</strong>car<strong>di</strong>a, ecc.). In<br />

questi ca<strong>si</strong> l’adrenalina va somministrata per via intramuscolare<br />

profonda, preferib<strong>il</strong>mente sulla superfi cie<br />

anterolaterale della coscia 115 . Le quantità sono in<br />

funzione del peso corporeo: 0,01 mg/kg, os<strong>si</strong>a 0,01<br />

ml/kg <strong>di</strong> una soluzione 1:1000 (dose mas<strong>si</strong>ma 0,5 ml).<br />

La dose iniziale può essere ripetuta dopo 5-10 minuti,<br />

fi no ad un mas<strong>si</strong>mo <strong>di</strong> tre do<strong>si</strong>, in caso <strong>di</strong> per<strong>si</strong>stenza<br />

o aggravamento della <strong>si</strong>ntomatologia 62 116 . In caso<br />

<strong>di</strong> ipoten<strong>si</strong>one è ut<strong>il</strong>e somministrare rapidamente per<br />

via endovenosa dei liqui<strong>di</strong>, in particolare la soluzione<br />

fi <strong>si</strong>ologica (NaCl 0,9%), fi no alla dose <strong>di</strong> 20-30 ml/kg<br />

nella prima ora 117 . In presenza <strong>di</strong> <strong>di</strong>ffi coltà respiratoria<br />

(stridore laringeo, wheezing, <strong>di</strong>spnea) occorre inoltre<br />

somministrare os<strong>si</strong>geno in maschera e un farmaco<br />

broncod<strong>il</strong>atatore per via inalatoria 118 . Il Salbutamolo,<br />

per la sua rapi<strong>di</strong>tà <strong>di</strong> azione, è <strong>il</strong> farmaco <strong>di</strong> prima<br />

scelta e può essere somministrato alla dose <strong>di</strong> 2,5 mg<br />

(0,5 ml - 10 gtt) della soluzione allo 0,5% o per mezzo<br />

<strong>di</strong> aerosol predosati. In caso <strong>di</strong> per<strong>si</strong>stenza <strong>di</strong> <strong>si</strong>ntomi<br />

respiratori e/o gastrointestinali (refrattari alle terapie<br />

precedenti) <strong>si</strong> ricorre all’ut<strong>il</strong>izzo <strong>di</strong> corticosteroi<strong>di</strong>: 1-2<br />

mg/kg <strong>di</strong> prednisone orale. La dose <strong>di</strong> steroi<strong>di</strong> deve<br />

essere ripetuta se insorge <strong>il</strong> vomito entro 30 minuti<br />

dalla prima assunzione 119 .<br />

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<strong>Come</strong> <strong>si</strong> <strong>dovrebbe</strong> <strong>fare</strong> e <strong>valutare</strong> <strong>il</strong> <strong>Test</strong> <strong>di</strong> provocazione orale per alimenti. Norme pratiche <strong>di</strong> comportamento

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