Real time QRS duration measurement in electrocardiogram
First Claim
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1. A system comprising:
- an analog front end module configured to collect ECG data from one or more leads andoperable to convert the analog ECG data to digital ECG data; and
a mobile device coupled to receive the digital ECG data;
wherein the analog front end is operable to;
receive a stream of raw ECG data samples comprising PQRST pattern cycles; and
filter the raw ECG data to form filtered ECG data to minimize baseline wander; and
wherein the mobile device is configured to;
determine an R point of a PQRST pattern in the filtered ECG data;
select a portion of samples from the filtered ECG data surrounding the R point;
normalize the portion of samples to a baseline;
determine a rising inflection point and a falling inflection point by taking a first derivative of the normalized portion of samples;
produce a first straight line function from a maximum one of the normalized portion of samples and the rising inflection point;
produce a second straight line function from the maximum one of the normalized portion of samples and the falling inflection point; and
derive the QRS duration from a difference in time between an intersection of the baseline and the first straight line function and an intersection of the base line and the second straight line function.
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Abstract
ECG data may be processed in a mobile device by receiving a stream of filtered ECG data samples comprising PQRST pattern cycles. An R point of a PQRST pattern in the filtered ECG data is determined. A portion of samples is selected from the filtered ECG data surrounding the R point. QRS duration of the PQRST pattern is then determined by processing the selected portion of samples using an application program executed by the mobile device.
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7 Claims
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1. A system comprising:
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an analog front end module configured to collect ECG data from one or more leads and operable to convert the analog ECG data to digital ECG data; and a mobile device coupled to receive the digital ECG data; wherein the analog front end is operable to; receive a stream of raw ECG data samples comprising PQRST pattern cycles; and filter the raw ECG data to form filtered ECG data to minimize baseline wander; and wherein the mobile device is configured to; determine an R point of a PQRST pattern in the filtered ECG data; select a portion of samples from the filtered ECG data surrounding the R point; normalize the portion of samples to a baseline; determine a rising inflection point and a falling inflection point by taking a first derivative of the normalized portion of samples; produce a first straight line function from a maximum one of the normalized portion of samples and the rising inflection point; produce a second straight line function from the maximum one of the normalized portion of samples and the falling inflection point; and derive the QRS duration from a difference in time between an intersection of the baseline and the first straight line function and an intersection of the base line and the second straight line function. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification