Method and system for detection of cardiac arrhythmia

A - Human Necessities – 61 – B

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A61B 5/046 (2006.01) A61N 1/37 (2006.01) G06F 17/00 (2006.01) A61B 5/0464 (2006.01) A61N 1/39 (2006.01)

Patent

CA 2422851

There are many different serious cardiac arrhythmias. The present invention uses measurements of RR intervals (interbeat intervals) to detect, in particular but not exclusively, atrial fibrillation of a patient. Atrial fibrilation is a serious ailment in which the heartbeat is generally rapid and irregular. Probability density histograms of .DELTA.RRs (difference between two successive RR intervals) collected during atrial fibrillation of a plurality of subjects are used as a template for the detection of atrial fibrillation. In one implementation, there are 16 standard probability density .DELTA.RRs histograms every 50 ms of mean RR interval of a certain number of beats, where the mean RR interval ranges from 350 ms to 1149 ms. Similarity between the standard probability density histograms and a test density probability histogram of .DELTA.RRs of a patient is estimated by the Kolmogorov-Smirnov test. If the test density histogram is not significantly different from the standard density histogram, atrial fibrillation is detected.

Il existe plusieurs types différents d'arythmies cardiaques graves. La présente invention utilise les mesures d'intervalles RR (intervalles entre les battements) pour détecter la fibrillation auriculaire d'un patient, entre autres. La fibrillation auriculaire est un dysfonctionnement grave impliquant un battement du coeur généralement rapide et irrégulier. On utilise des histogrammes de densité de probabilité de .DELTA.RR (différence entre deux intervalles RR successifs) réalisés pendant la fibrillation auriculaire d'une pluralité de sujets comme référence pour la détection d'une fibrillation auriculaire. Dans un mode de réalisation, on compte 16 histogrammes standard .DELTA.RR de densité de probabilité à chaque 50 ms d'un intervalle RR moyen d'un nombre donné de battements, l'intervalle RR moyen étant compris entre 350 ms et 1149 ms. On détermine la similarité entre les histogrammes standard de densité de probabilité et un histogramme test de densité de probabilité de .DELTA.RR d'un patient au moyen d'un test de Kolmogorov-Smirnov. Si l'histogramme de densité de test n'est pas sensiblement différent de l'histogramme de densité standard, une fibrillation auriculaire est détectée.

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