Method and apparatus for analyzing electrocardiographic signals
November 5, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesMethod and system for rapid non-invasive determination of the systolic time intervals Fiducial point location Method and apparatus for identifying recurring signal patterns Method and apparatus for extracting systolic valvular events from heart sounds Method and apparatus for determining ventricular fibrillation Electrocardiographic means and method for detecting potential ventricular tachycardia Cardiac arrhythmia analysis system System and method for predicting ventricular tachycardia by adaptive high pass filter System and method for predicting ventricular tachycardia with a gain controlled high pass filter System and method for predicting ventricular tachycardia by derivative analysis InventorsApplicationNo. 06/668245 filed on 11/05/1984US Classes:600/509, Detecting heartbeat electric signal600/515, Detecting arrhythmia600/516Variation in duration of segment of PQRST signal waveform (e.g., QRS complex, etc.) detectedExaminersPrimary: Ruggiero, JosephAssistant: Meyer, Charles B. Attorney, Agent or FirmInternational ClassesA61B 5/0452 (20060101)G06F 17/00 (20060101) AbstractECG signals are digitized and a template representative of an arrhythmia free interval for a particular patient is formed. Subsequent ECG signals which match the template are averaged to form averaged ECG signals to reduce noise. A fast Fourier transform (FET) is performed on the terminal 40 millisecond portion of the QRS complex and the ST segment. The 60 db area and 40 Hz intercept of the resultant spectral output are used as a figure of merit in predicting the liklihood of a particular patient experiencing ventricular tachycardia. Alternatively, the FET magnitude is squared to form energy spectra of the ECG signals and a measure of the energy in a first preselected portion such as the 20-50 Hz region is compared with a second preselected portion such as the entire spectra to form a figure of merit for predicting ventricular tachycardia. | |
