Automated detection of myocardial ischaemia by epicardial miniature ultrasound transducers — a novel tool for patient monitoring during cardiac surgery☆

Espinoza, Andreas; Halvorsen, Per Steinar; Skulstad, Helge; Lundblad, Runar; Bugge, J. F.; Hoff, Lars; Fosse, Erik; Edvardsen, Thor

doi:10.1016/j.ejcts.2010.03.067

Cited by 12 publications

(17 citation statements)

References 17 publications

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“…For ischemia detection by the ultrasound transducer a combination of peak systolic and postsystolic velocities may enhance the accuracy of the method in distinguishing such situations from reduced systolic contraction due to ischemia. It has been demonstrated that coronary stenosis or occlusion reduces systolic and increases postsystolic velocities [35]. These findings are extended in this thesis.…”

Section: Microsensors For Myocardial Ischemia Detection the Miniaturisupporting

confidence: 67%

“…The method enables continuous monitoring of heart wall contractions by use of an M-mode image and real-time calculation of myocardial velocities. This transducer has shown to be superior in detecting myocardial ischemia compared to ECG and invasive hemodynamic monitoring during off-pump coronary artery bypass surgery [35].…”

Section: Ultrasound Transducersmentioning

confidence: 99%

“…Placed on the left ventricle the sensor provided a real-time M-mode image of the heart wall where systolic thickening and diastolic thinning could be visualized. From this M-mode picture the corresponding wall thickening and thinning myocardial velocities were displayed and measured [34,35]. In order to measure myocardial velocities within the cardiac cycle the ECG and left ventricular pressure were displayed together with the M-mode picture and the velocity curve obtained from the ultrasonic transducer.…”

Section: Sensor Systems Epicardial Ultrasonic Systemmentioning

confidence: 99%

“…In the M-mode picture an infarcted segment may be differentiated from an ischemic segment, as the infarcted segment has neither wall thickening during systole nor wall thinning during diastole. Together with reduced peak systolic contraction the postsystolic contraction can be quantified by automated signal analysis with the ultrasound transducer [35]. The ultrasound transducer thereby enables an operator independent and precise detection of myocardial ischemia.…”

Section: Microsensors For Myocardial Ischemia Detection the Miniaturimentioning

confidence: 99%

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Continuous Monitoring of Regional Function by a Miniaturized Ultrasound Transducer Allows Early Quantification of Low-Grade Myocardial Ischemia

Hyler

Pischke

Halvorsen

et al. 2015

Journal of the American Society of Echocardiography

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The epicardially attached miniaturized ultrasound transducer allowed the precise detection of different levels of coronary flow reduction. The results also showed a quantitative and linear relationship among coronary flow, ischemia, and myocardial function. Thus, the ultrasound transducer has the potential to improve the monitoring of myocardial ischemia and to detect graft failure during and after heart surgery.

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Section: Microsensors For Myocardial Ischemia Detection the Miniaturisupporting

confidence: 67%

Section: Ultrasound Transducersmentioning

confidence: 99%

Section: Sensor Systems Epicardial Ultrasonic Systemmentioning

confidence: 99%

Section: Microsensors For Myocardial Ischemia Detection the Miniaturimentioning

confidence: 99%

See 2 more Smart Citations

Continuous Monitoring of Regional Function by a Miniaturized Ultrasound Transducer Allows Early Quantification of Low-Grade Myocardial Ischemia

Hyler

Pischke

Halvorsen

et al. 2015

Journal of the American Society of Echocardiography

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“…In a study on patients undergoing off‐pump coronary bypass surgery, the epicardial sensors could detect ischaemia similar to the reference method 2D echocardiography . Importantly, the signal could also be analysed automatically and detect ischaemia equally good as manual offline analysis.…”

mentioning

confidence: 99%

Monitoring of myocardial function by ultrasonic transducers

Espinoza

2014

Acta Anaesthesiol Scand

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Background:The aim of this PhD thesis was to provide a continuous method to monitor myocardial function during cardiac surgery with the superior sensitivity of ultrasonic technique and the continuity of electrocardiographic (ECG) monitoring. Methods: An ultrasound system with epicardial transducers was provided, presenting real-time M-mode LV wall images. In two experimental studies the transducers were tested. Their sensitivity in myocardial function assessment was compared to ECG and hemodynamics during ischemia and hypothermia. In one patient study during off-pump coronary artery bypass surgery the transducers were used to monitor myocardial function, and an automated analysis algorithm was tested. Results: In the experimental studies the ultrasound system could detect myocardial dysfunction during ischemia, and diastolic dysfunction during hypothermia. In the patient study the ultrasound signal detected ischemia without concomitant ECG ST-segment abnormalities or hemodynamic changes. The automated algorithm had equal sensitivity for detection of ischemic myocardial dysfunction as manual off-line analysis. Conclusions: The provided ultrasound system could give continuous real-time monitoring of myocardial function, and detect myocardial dysfunction with superior sensitivity than ECG or hemodynamic monitoring. This could be used for improved monitoring of myocardial function during cardiac surgery.

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Effects of Therapeutic Hypothermia on Left Ventricular Function Assessed by Ultrasound Imaging

Espinoza¹,

Kerans²,

Opdahl³

et al. 2013

Journal of the American Society of Echocardiography

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Automated detection of myocardial ischaemia by epicardial miniature ultrasound transducers — a novel tool for patient monitoring during cardiac surgery☆

Abstract: The ultrasonic system detected regional ischaemia during LAD occlusion. An automated analysis algorithm demonstrated excellent ability to detect ischaemia. This technology can develop into a useful tool to detect ischaemia in cardiac surgery.

Cited by 12 publications

References 17 publications

Continuous Monitoring of Regional Function by a Miniaturized Ultrasound Transducer Allows Early Quantification of Low-Grade Myocardial Ischemia

Continuous Monitoring of Regional Function by a Miniaturized Ultrasound Transducer Allows Early Quantification of Low-Grade Myocardial Ischemia

Monitoring of myocardial function by ultrasonic transducers

Effects of Therapeutic Hypothermia on Left Ventricular Function Assessed by Ultrasound Imaging

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