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On mesure la pression artérielle d'un patient en position debout au niveau du bras à l'aide d'un brassard et on la compare à celle mesurée au niveau central (proche du coeur) en position couchéele brassard est à la même hauteur que le coeur et les artères ne rétrécissent pas cette différence s'explique par :- la perte de charge entre le cœur et le bras- l'effet de a gravité- l'onde de réflexion du pouls- l'accumulation du sang dans les veines des membres inférieurs en position debout
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