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C. Pour and L. Vcr, le sexe et l'âge du patient doivent être notés, la PA au membre supérieur (mmHg, syst/diast) et la FC sont mesurées en début d'examen

V. Procédure and . Il-sera-expliquée-au-sujet, la suspension de la respiration (breath holding) ne doit pas être précédée d'une inspiration profonde (facteur de VC), il doit tenir sans respirer environ 30 secondes, il reprendra une respiration normale également sans inspirer profondément. L'examinateur fera la manoeuvre en même temps que lui. S'il reprend sa respiration avant 25-30 sec

L. Sera-examinée-en-fenêtre-temporalepsv, T. Edv, and I. , 45-50 mm, le signal Doppler sera enregistré en continu Mélange enrichi en CO2 Si le test de suspension respiratoire (BHT, Blocpnée) n'est pas concluant (normal vs anormal), la capacité de VD sera évaluée par inhalation d'un mélange -5% CO2, 95% O2-au masque avec un débit de 6 à 10 litres/min

. Suffisent, A l'arrêt de l'inhalation, le flux revient à l'état basal en quelques secondes