Patent ID: 6873869

Claim:
A method of obtaining an electrocardiograph of a patient under environment conditions in which the patient is also simultaneously undergoing at least one other procedure generating at least one other electromagnetic noise signal, the method comprising the steps of: subjecting the patient to the at least one other procedure generating the at least one other electromagnetic noise signal; dividing the patient lengthwise by a median plane; forming a first measurement circuit ( 2 ) consisting of a first pair of electrodes; forming a second measurement circuit ( 4 ) consisting of a second pair of electrodes; simultaneously obtaining an electrocardiograph signal (S 1 ), including the electromagnetic noise signal, on a side of the median plane including the heart of the patient as a first differential signal measured across the first pair of electrodes; obtaining, under essentially identical environmental conditions, a second measurement signal (S 2 ), including the electromagnetic noise signal, on an opposite side of the median plane remote from the heart of the patient as a second differential signal measured across the second pair of electrodes and is different from the first measurement circuit; one of adding and subtracting the second differential signal from the first differential signal, in real time, based on a polarity of the electromagnetic noise signal in the second measurement signal (S 2 ) relative to the electromagnetic noise signal in the electrocardiograph signal (S 1 ) to obtain a resulting signal (SR) substantially devoid of the electromagnetic noise signal; and processing and displaying, in real time, the resulting signal (SR) representing the electrocardiograph signal (S 1 ).