System for displaying cardiac arrhythmia data
First Claim
1. A method comprising the steps of:
- selecting a stored arrhythmic episode from a plurality of arrhythmic episodes, the stored arrhythmic episode having a plurality of complexes;
calculating a similarity value and a dissimilarity value for each complex of the plurality of complexes of the selected arrhythmic episode with respect to normal sinus rhythm complexes; and
plotting one or more symbols representing the complexes as a function of the calculated similarity values and the dissimilarity values on an interactive display screen.
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Abstract
A medical device system and method of plotting symbols representing complexes of selected arrhythmic events on an interactive display screen, for organizing, displaying and interacting with a patient'"'"'s recorded arrhythmia episodes. Stored arrhythmic episode are selected from a plurality of arrhythmic episodes, where the stored arrhythmic episode having a plurality of complexes. A similarity value and a dissimilarity value is calculated for each complex of the plurality of complexes of the selected arrhythmic episode with respect to normal sinus rhythm complexes. Symbols representing the arrhythmic complexes are then plotted as a function of the calculated similarity values and the dissimilarity values on an interactive display screen. Additional information relating to the arrhythmic event is elicited through interacting with the symbols displayed on the interactive display screen.
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Citations
33 Claims
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1. A method comprising the steps of:
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selecting a stored arrhythmic episode from a plurality of arrhythmic episodes, the stored arrhythmic episode having a plurality of complexes; calculating a similarity value and a dissimilarity value for each complex of the plurality of complexes of the selected arrhythmic episode with respect to normal sinus rhythm complexes; and plotting one or more symbols representing the complexes as a function of the calculated similarity values and the dissimilarity values on an interactive display screen. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method comprising the steps of:
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selecting a stored arrhythmic episode from a plurality of arrhythmic episodes, the stored arrhythmic episode having a plurality of complexes; calculating a similarity value and a dissimilarity value for each complex of the plurality of complexes of the selected arrhythmic episode with respect to normal sinus rhythm complexes, the step of calculating including the steps of; determining an arrhythmic vector, A, for each complex of the plurality of complexes based on predetermined waveform characteristics of cardiac QRS-waves recorded during the arrhythmic episode, the arrhythmic vector including a set of numbers, each number associated with a particular morphological point of the complex; determining a normal rhythm vector, N, based on predetermined waveform characteristics of cardiac QRS-waves recorded during normal sinus rhythm, the normal rhythm vector including a set of numbers, each number associated with a particular morphological point of the normal sinus rhythm; and calculating the similarity value with the equation [A·
N]/[N·
N] and the dissimilarity value with the equation SQRT [(A·
A)/(N·
N)-((A·
N)/(N·
N))2 ] for each complex of the arrhythmic event;plotting on an interactive display screen one or more symbols representing the complexes as a function of the calculated similarity values and the dissimilarity values on a discrimination plane having a similarity coordinate axis and a dissimilarity coordinate axis which is orthogonal to the similarity coordinate axis; and grouping symbols representing one or more arrhythmic episodes within a defined boundary on the interactive display screen. - View Dependent Claims (18, 19, 20, 21, 22)
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23. A method comprising the steps of:
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calculating a morphological metric value for each complex of an arrhythmic episode from predetermined morphology characteristics of each complex and predetermined morphology characteristics of normal sinus rhythm complexes; and plotting symbols representing each complex as a function of the morphological metric values on an interactive display screen. - View Dependent Claims (24)
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25. A method of graphically depicting arrhythmic episodes, comprising the steps of:
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electronically recording signals representing an arrhythmic episode, where the arrhythmic episode has a plurality of complexes; processing the plurality of complexes to derive an arrhythmic vector for each complex of the plurality of complexes, the act of processing including the acts of; isolating each complex of the plurality of complexes according to a known morphological template; recording waveform characteristics at predetermined morphological points of each complex, including maxima and minima, such that each complex is represented by the arrhythmic vector, the arrhythmic vector including a set of numbers, each number associated with a particular morphological point of the complex; storing each arrhythmic vector associated with each complex; comparing each arrhythmic vector with a normal rhythm vector, the normal rhythm vector including a set of numbers associated with a set of numbers characterizing a normal sinus rhythm complex; and mapping a symbol representing similarity of each arrhythmic vector to the normal rhythm vector.
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26. A medical device system, comprising:
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a cardiac defibrillator including electronic control circuitry for determining the occurrence of an arrhythmic episode of a heart; a medical device programmer having programmer electronic circuitry coupled to an interactive display screen and the electronic control circuitry of the cardiac defibrillator, where the programmer electronic circuitry receives stored arrhythmic episodes from the electronic control circuitry, the arrhythmic episodes having a plurality of complexes, and where the one or more stored arrhythmic episodes are selected through the interactive display, for which the programmer electronic control circuitry calculates a similarity value and a dissimilarity value for each complex of the selected arrhythmic episode with respect to normal sinus rhythm complexes, and plots one or more symbols representing the complexes as a function of the calculated similarity values and the dissimilarity values on the interactive display screen. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33)
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Specification