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US 2002/0120306 A1Published application
Cardiac rhythm management device with triggered diagnostic mode
AssigneeCardiac Pacemakers, Inc.
InventorsQingsheng Zhu, Julio C. Spinelli, Bruce H. KenKnight, Gerrard M. Carlson
Life of this patent
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Abstract
A device and method in which spectral analysis of heart rate variability is performed in order to assess autonomic balance. When a threshold level is reached, a diagnostic mode is triggered in which the device performs computationally intensive data analysis to assess the probability of a pathological event such as an arrhythmia occurring.
Claims20
A cardiac rhythm management device, comprising:
- a sensing channel for sensing ventricular electrogram signal and generating a ventricular sense (R wave) when the electrogram signal exceeds a specified threshold value;
- circuitry for measuring and collecting time intervals between successive R waves and storing the collected intervals as a discrete RR interval signal;
- bandpass filters for filtering the RR interval signal into defined high and low frequency bands;
- a power detector for determining the signal power of the RR interval signal in each of the low and high frequency bands, referred to LF and HF, respectively;
- and,
- circuitry for computing an LF/HF ratio and triggering a diagnostic mode if the LF/HF ratio exceeds a predetermined ratio threshold value, wherein upon entering the diagnostic mode, the device activates processing circuitry that performs data analysis to assess the probability of the occurrence of a pathological event.
3 more elements
A method for operating a cardiac rhythm management device, comprising:
- sensing ventricular electrogram signals and generating a ventricular sense (R wave) when the electrogram signal exceeds a specified threshold value;
- measuring and collecting time intervals between successive R waves and storing the collected intervals as a discrete RR interval signal;
- filtering the RR interval signal into defined high and low frequency bands;
- determining the signal power of the RR interval signal in each of the low and high frequency bands, referred to LF and HF, respectively;
- and, computing an LF/HF ratio and triggering a diagnostic mode if the LF/HF ratio exceeds a predetermined ratio threshold value, wherein upon entering the diagnostic mode, the device activates processing circuitry that performs data analysis to assess the probability of the occurrence of a pathological event.
2 more elements
Dependencies are inferred from the claim text.