Method and apparatus for predicting the efficacy of cardioversion
First Claim
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1. A method for determining the likelihood that cardioversion will cause a patient with atrial fibrillation to revert to normal sinus rhythm cardioversion including the steps of:
- monitoring the flow of blood through the patient'"'"'s atrium;
generating a velocity signal representing the velocity of blood flow over a diagnostic time interval including a plurality of cardiac cycles;
generating a differential radius signal based upon chaotic and differential processing of the velocity signal over the diagnostic time interval; and
determining the number of instances that the differential radius signal exceeds a threshold value over the diagnostic time interval thereby to indicate whether the patient will revert to normal sinus rhythm by cardioversion.
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Abstract
An apparatus and method for predicting the efficacy of cardioversion as a dality for reverting a patient with atrial fibrillation to normal sinus rhythm. Blood flow through the patient'"'"'s atrium is measured, converted and processed using nonlinear or chaotic processing to obtain a differential radius signal. The number of excursions of the differential radius beyond a threshold value indicates whether cardioversion will be successful.
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Citations
20 Claims
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1. A method for determining the likelihood that cardioversion will cause a patient with atrial fibrillation to revert to normal sinus rhythm cardioversion including the steps of:
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monitoring the flow of blood through the patient'"'"'s atrium; generating a velocity signal representing the velocity of blood flow over a diagnostic time interval including a plurality of cardiac cycles; generating a differential radius signal based upon chaotic and differential processing of the velocity signal over the diagnostic time interval; and determining the number of instances that the differential radius signal exceeds a threshold value over the diagnostic time interval thereby to indicate whether the patient will revert to normal sinus rhythm by cardioversion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. Apparatus for determining the likelihood cardioversion will cause a patient with atrial fibrillation to revert to normal sinus rhythm, said apparatus comprising:
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means for monitoring the flow of blood through the patient'"'"'s atrium; first generating means for generating a velocity signal representing the velocity of blood flow over a diagnostic time interval including a plurality of cardiac cycles; second generating means for generating a differential radius signal based upon chaotic and differential processing of the velocity signal over the diagnostic time interval; and threshold evaluation means for determining the number of instances that the differential radius signal exceeds a threshold value over the diagnostic time interval thereby to indicate whether the patient will revert to normal sinus rhythm by cardioversion. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification