AUTOMATED MONITORING OF MYOCARDIAL FUNCTION BY ULTRASONIC TRANSDUCERS POSITIONED ON THE HEART
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United States of America Patent
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Issued Date -
Feb 24, 2011
app pub date -
Aug 29, 2008
filing date -
Aug 30, 2007
priority date (Note) -
Abandoned
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Abstract
The invention relates to a method and a post-operative care unit for analysing and quantifying an ultrasound tissue Doppler imaging (TDI) signal from a transducer fastened on the myocardium to obtain a parameter indicating regional cardiac ischaemia or correlates with global hypokinetic heart function. This has the advantage over manually operated probes that it can be automated and used continuously over long time. According to the method, a TDI signal trace corresponding to at least one of tissue velocity, strain or strain rate is extracted and correlated with an electrocardiogram to define subsections within a cardiac cycle in the extracted trace corresponding to the early systolic phase and the post-systolic phase. Then, a velocity, strain or strain rate is read in at least the post-systolic phase of the extracted trace, and a parameter which is a function of one of these readings and which indicates ischaemia or global hypokinetic function is generated.
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