Surgery – Diagnostic testing – Cardiovascular
Patent
1998-04-03
1999-08-24
Kamm, William E.
Surgery
Diagnostic testing
Cardiovascular
A61B 50468
Patent
active
059418311
ABSTRACT:
A method for detecting or classifying cardiac arrhythmias using interval irregularity. The method includes the steps of detecting a patient's cardiac activity and looking at a first selected criterion such as the patient's heart rate exceeding a preset rate threshold to determine if a tachycardia is present. When the first criterion is met, a window of N successive cardiac intervals is selected for analysis. A selected number of the shortest and longest intervals are ignored and the difference between the remaining longest and shortest intervals is calculated to provide a measure of interval irregularity indicative of the origin of the cardiac rhythm. In one embodiment, a parameter n is set such that 0.ltoreq.n<N/2, and the intervals in the window are ordered from shortest to longest with the shortest being interval 1 and the longest being interval N. The difference between interval N-n and interval n+1 is then computed to provide a measure of interval irregularity which is indicative of the origin of a cardiac rhythm. For example, if n=1, the longest and shortest of the intervals in a window of intervals are discarded, and the difference between the duration of the second longest and second shortest is calculated and this difference is a measure of interval irregularity. The difference is compared to a selected irregularity threshold and if the difference is greater than the threshold, the rhythm is considered irregular. If the difference is less than or equal to the irregularity threshold, the rhythm is considered regular.
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Kamm William E.
Mitchell Steven M.
Pacesetter Inc.
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