Patent ID: 8506500

Claim:
A tachyarrhythmia detection and classification system, comprising: a cardiac sensing circuit configured to sense a cardiac signal; a hemodynamic sensor configured to sense a hemodynamic signal; a tachyarrhythmia detector coupled to the cardiac sensing circuit, the tachyarrhythmia detector configured to detect a tachyarrhythmia episode using the cardiac signal; a physiological parameter generator coupled to the physiological sensor, the physiological parameter generator configured to measure an arrhythmic hemodynamic parameter from the hemodynamic signal during the detected tachyarrhythmia episode; and a morphology-based tachyarrhythmia classification module coupled to the cardiac sensing circuit, the physiological parameter generator, and the tachyarrhythmia detector, the morphology-based tachyarrhythmia classification module configured to extract arrhythmic morphological features of an arrhythmic heart beat of the detected tachyarrhythmia episode from the cardiac signal, compute a measure of similarity between the extracted arrhythmic morphological features of the arrhythmic heart beat and template morphological features of a template heart beat, and compare the computed measure of similarity to a beat classification threshold to classify the arrhythmic heart beat, the morphology-based tachyarrhythmia classification module including a threshold generator configured to dynamically adjust the beat classification threshold using the arrhythmic hemodynamic parameter and a template hemodynamic parameter, wherein the hemodynamic signal comprises at least one of an impedance signal indicative of a transthoracic impedance or a cardiac impedance, a pressure signal indicative of an arterial pressure, a signal indicative of blood flow, a signal indicative of heart sounds, an oximetry signal indicative of blood oxygenation, a plethysmographic signal indicative of cardiac output, a respiratory signal, or a cardiac contractility signal, and the hemodynamic sensor comprises at least one of an impedance sensor configured to sense the impedance signal, a pressure sensor configured to sense the pressure signal, a flow sensor configured to sense the signal indicative of blood flow, a heart sound sensor configured to sense the signal indicative of heart sounds, a pulse oximetry sensor configured to sense the oximetry signal, a photoplethysmography sensor configured to sense the plethysmo graphic signal, a respiratory sensor configured to sense the respiratory signal, or a cardiac contractility sensor configured to sense the cardiac contractility signal.