Non-invasive method for diagnosing alzheimer's disease in a...

A - Human Necessities – 61 – B

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A61B 3/11 (2006.01) A61B 5/16 (2006.01)

Patent

CA 2195877

The present invention provides non-invasive methods for diagnosing Alzheimer's disease in a living human subject. One method employs a non-invasive automated apparatus which can continuously monitor pupil diameter size over time; repetitively measure pupil diameter size over time for a pre-chosen duration ranging from about less than 1 second to about 5 minutes; and cumulatively record size information as it is obtained over time. A second method employs an apparatus which can repetitively measure pupil constriction velocity for a pre-chosen duration both before and after stimulation by visible light. Both methods require the administration of at least one neural transmitter mediator to a targeted eye of the living subject in an amount insufficient to cause marked changes in pupil diameter size over time in a person who is not afflicted with Alzheimer's disease. The marked hypersensitivity of an Alzheimer's dementia patient to the administered neural transmitter mediator serves as the means for identifying individuals afflicted with Alzheimer's disease.

L'invention porte sur des méthodes non invasives de diagnostic de la maladie d'Alzheimer chez l'homme. L'une d'elles porte sur un appareil automatique permettant de suivre le diamètre de la pupille en fonction du temps et à en effectuer répétitivement à intervalle préétabli variant de 1 seconde à 5 minutes des mesures qui sont l'objet d'un enregistrement cumulatif dans le temps. Une seconde méthode utilise un appareil permettant d'effectuer des mesures répétitives de la vitesse de constriction de la pupille pendant une durée préétablie précédant et suivant la stimulation par de la lumière visible. Les deux méthodes requièrent l'administration à l'oeil cible d'au moins un agent neural de transmission d'une dose suffisante insuffisante pour produire des variations notables dans le temps du diamètre de la pupille chez une personne non atteinte de la maladie d'Alzheimer. L'hypersensibilité marquée d'un patient atteint de la démence d'Alzheimer à l'administration d'un agent neural de transmission est un moyen d'identifier les personnes atteintes de la maladie d'Alzheimer.

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