Cardiac arrhythmia detection and recording
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United States of America Patent
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-
Jul 3, 1984
Issued Date -
N/A
app pub date -
Oct 22, 1979
filing date -
Sep 18, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Cardiac arrhythmias are detected by measuring the duration of the first derivative of the QRS component signal of a cardiac rhythm and comparing such duration to a running average duration, and/or by measuring the duration of the R-R interval and comparing such interval to a running average interval. A cassette recorder in a portable battery-operated monitor for ambulatory patients is activated in response to an arrhythmia detected by either one of the above techniques. The cardiac rhythm signal is fed to the recorder through a delay network such that the recorded signal brackets the detected arrhythmia. A manual record switch is also provided for separate wearer actuation to record what he considers to be unusual heart activity.
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