Low noise, high bandwidth, augmented lead circuit for acquisition of cardiac pacing artifacts
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United States of America Patent
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Jan 20, 1998
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app pub date -
Sep 17, 1996
filing date -
Sep 17, 1996
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Abstract
Disclosed are a method of and apparatus for deriving augmented lead electrocardiograph (ECG) signals from electrical signals sensed at three skin surface, limb electrodes attached to a patient's limbs without the use of a high impedance resistor network. First, second and third pairs of the three limb electrodes are combined to provide first, second and third positive and negative limb lead signal pairs. The first, second and third positive and negative limb lead signal pairs are combined and amplified to provide first, second, and third limb lead signals (LI, LII and LIII). The first, second and third amplified lead limb signals LI, LII and LIII are combined into augmented lead signals aVR, aVL, aVF through a low impedance resistor network and operational amplifiers, in accordance with the formulas: aVR=-0.5 (LI+LII), aVL=0.5 (LI-LIII), and aVF=0.5 (LII+LIII).
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