QUALITY INDICATOR FOR LEAD/ELECTRODE IN ECG
Publication Date: 2005-Apr-07
The IP.com Prior Art Database
In an embodiment, the indicator is configured to detect the degradation of the electrode signal prior to clinician discernment of ECG lead degradation. The indicator predicts ECG lead degradation by analyzing the time course of electrode data and notifying the clinician of a degrading electrode
FIELD OF THE INVENTION
 This invention relates to a quality indicator for lead/electrode in ECG.
BACKGROUND OF THE INVENTION
 An electrocardiogram (ECG) is produced by detecting cardiac impulses through electrodes applied to the chest or limbs of a patient. The voltage difference between combinations of electrodes form an ECG lead. ECG leads are viewed by clinicians to diagnose cardiac performance. Electrode signals inherently degrade with time due to drying of the electrolyte and loss of adhesion. In addition, improper skin preparation prior to electrode placement and environmental effects such as fluid ingress degrade the electrode signals. The deterioration of the electrode signal quality results in a loss of ECG lead monitoring often without advanced warning as to when monitoring will cease.
 It is known that electrode to skin impedance improves during the first few minutes (T0- T1) following electrode application due to the chemical reaction of the electrolyte with the human skin. After hours of application, the impedance increases to a level at time T2, where the electrode quality may begin to degrade lead quality. When the impedance increases to an unacceptable level (> 30 MW) at time T3, a lead fail message will occur and lead monitoring will cease.
BRIEF DESCRIPTION OF THE DRAWINGS
 FIG. 1 shows a general curve depicting the electrode aging.
 FIG. 2 shows a hypothesized correlation between ECG lead quality and ECG lead impedance.
DETAILED DESCRIPTION OF THE INVENTION
 Various embodiments of this invention provide a quality indicator for lead/electrode in ECG.
 Generally, the ECG lead fail data currently used to detect a disconnected electrode may correlate to the quality of the ECG electrode signal. If so, this data could serve as a predictive indicator of ECG lead quality.
 In an embodiment, the indicator is configured to detect the degradation of the electrode signal prior to clinician discernment of ECG lead degradation. The indicator predicts ECG lead degradation by analyzing the...