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Method and system for improved measurement of t-wave alternans

An alternating measurement, odd number technique, used in the field of cardiology

Active Publication Date: 2004-08-18
GE MEDICAL SYST INFORMATION TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Also, when heart rate reaches footfall rate or double pedaling rate, it is difficult to distinguish superimposed artefacts from true T wave alternation

Method used

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  • Method and system for improved measurement of t-wave alternans
  • Method and system for improved measurement of t-wave alternans
  • Method and system for improved measurement of t-wave alternans

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Embodiment Construction

[0016] Figure 1A and 1B An example of a human surface ECG 100 is provided. The deflection 102 is called a "P wave" and is caused by atrial stimulation. Deflections 104, 106, and 108 are referred to as "Q waves," "R waves," and "S waves," respectively, and are caused by the contraction (depolarization) of the ventricles. The deflection 110 is called the "T wave" and results from the recovery (repolarization) of the ventricles.

[0017] The portion 112 of ECG 100 between the end of S wave 108 and the beginning of T wave 110 is referred to as the "ST segment." As used throughout this application, the term "T-wave" refers to and includes the T-wave and ST segment portions of the ECG.

[0018] T-wave alternation is a regular or beat-to-beat variation of the T-wave of the ECG that repeats every two beats and connects to the underlying cardiac instability. figure 2 The principle of T wave alternation for the sampled precordial ECG signal 200 is shown. In ECG 200, several beats...

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Abstract

The method and system comprise receiving digitized ECG data including a plurality of alternating consecutive odd and even beats (302), calculating a variability for at least one odd or even beat (304), and excluding certain beats from T-wave alternant measurements according to an exclusion procedure (310).

Description

technical field [0001] The field of the invention relates to cardiology. More specifically, the present invention relates to systems and methods for improving T-wave alternation by excluding certain beats from calculations. Background technique [0002] Electrical alternation is the difference in the electrical potential at corresponding points between alternating heartbeats. T-wave alternations are regular or beat-to-beat variations of the ST-segment or T-waves of the electrocardiogram (ECG) that repeat every beat and have been linked to underlying cardiac instability. Typically, by counting all consecutive heartbeats of a patient, a beat with an odd number is called an "odd beat" and a beat with an even number is called an "even beat". A patient's odd and even heartbeats will exhibit diagnostically different electrical characteristics that can be detected by ECG. [0003] The presence of these electrical alternations is significant because patients who are generally at ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/0452
CPCA61B5/0452A61B5/7207A61B5/349A61B5/355
Inventor 威利·凯泽马丁·芬德斯
Owner GE MEDICAL SYST INFORMATION TECH
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