In cases of aneurysm, determination of the state of the collateral circulation by measuring the blood pressure.
description in French: Épreuve de Pachon. Epreuve d'insuffisance cardiaque. Après effort, la baisse de la pression systolique et l'augmentation de la pression différentielle indiqueraient la diminution de la force de réserve du coeur. La valeur de cette épreuve est contesté.
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