| 摘要 |
A method and apparatus for creating a representative heartbeat obtains ECG data from a plurality of ECG waveforms, which are in turn obtained from signals received from a plurality of ECG electrodes. QRS detection logic detects heartbeats in the ECG data. Classification logic classifies heartbeats into categories based on shape and/or timing. Alignment logic aligns the heartbeats. This logic slides the heartbeats occurring at various times across a stationary alignment template to calculate when the heartbeats are best aligned, and performs adjustments to reduce the effects of noise or jitter on the different ECG waveforms. Representative heartbeat creation logic creates a representative heartbeat from the aligned heartbeats. This logic time slices through the aligned heartbeats, discarding a percentage of the smallest and largest magnitudes of the aligned heartbeats at each instance of time, and averaging the remaining magnitudes to produce a representative heartbeat. This trimmed averaging technique results in a high quality representative beat, since samples from noise and misclassified beats are discarded. The representative heartbeat is displayed, either alone or with head rate and/or other measurement information, to the cardiologist or medical professional for diagnosis of the condition of the patient's head, such as a diagnosis of coronary artery disease, based on finding a depressed ST segment in the representative heartbeat of a patient undergoing a stress or exercise test.
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