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Cardiac Rhythm Management System That Warns User of Prolonged Atrial Fibrillation Episode

IP.com Disclosure Number: IPCOM000028556D
Publication Date: 2004-May-20
Document File: 2 page(s) / 73K

Publishing Venue

The IP.com Prior Art Database

Abstract

It is clinically understood and documented that when a patent is experiencing a prolonged atrial fibrillation (AF) episode of about 48 hours or longer, delivering an electrical countershock to the atrium could cause the patient to have a stroke under certain circumstances. A cardiac rhythm management device that delivers an atrial countershock to interrupt the AF should not be delivered if the AF episode has lasted longer than about 48 hours. Moreover, a cardiac rhythm management device in which the patient has the ability to control whether an atrial shock is delivered, therefore, should also warn the patient if there has been a prolonged AF episode, which would make it risky to deliver a shock to treat the AF.

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Cardiac Rhythm Management System That Warns User of Prolonged Atrial Fibrillation Episode.

It is clinically understood and documented that when a patent is experiencing a prolonged atrial fibrillation (AF) episode of about 48 hours or longer, delivering an electrical countershock to the atrium could cause the patient to have a stroke under certain circumstances. A cardiac rhythm management device that delivers an atrial countershock to interrupt the AF should not be delivered if the AF episode has lasted longer than about 48 hours. Moreover, a cardiac rhythm management device in which the patient has the ability to control whether an atrial shock is delivered, therefore, should also warn the patient if there has been a prolonged AF episode, which would make it risky to deliver a shock to treat the AF.

In one example, a system provides a method and apparatus for warning the patient that they are experiencing a prolonged AF episode of 48 hours or longer. In a further example, this system also optionally prevents the cardiac rhythm management device and/or the patient from initiating a self-induced atrial shock to treat the AF if the AF episode has been present for 48 hours or longer. This is accomplished by including a timer that is coupled to the output of a sensing circuit that detects whether AF is present. The timer indicates whether AF has been present continuously or intermittently for longer than 48 hours. If so, atrial countershock delivery is inhibited by the device, to avoid inducing a...