Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Echocardiography offers the future for infarct size quantification

07.12.2011
"Up until now infarct size has only been measured as part of clinical studies and not in routine clinical practice. The reason being that the reference method of gadolinium based contrast agents in MRI is expensive, takes a great deal of time to perform, and can only be undertaken by imaging specialists," explains EAE president Dr Luigi Badano, from the University of Padua, Italy. "The advantages of STE over MRI is that it's far quicker to use, cheaper, and can be used by cardiologists at the bedside with portable machines, and repeated serially when ever needed."

Additionally, STE can be applied even in patients with contraindications for MRI, such as metallic devices, claustrophobia, and severe renal failure that preclude use of contrast infusions. "The studies presented here open the way for every patient who is admitted to hospital with STEMI to undergo assessment of infarct size with echocardiography prior to discharge," says Badano.

Infarct size matters for determining how well patients will recover from STEMI. Statistics suggest that people who suffer damage to more than 30% of the left ventricle are twice as likely to die within a year of the event than people who suffer less damage. "It's well known that patients with larger infarcts are more likely to undergo alterations in the structure (dimensions, mass and shape) of the left ventricle, known as cardiac remodelling, which leads to heart failure," says Badano.

Evidence is mounting, he adds, that screening for patients with larger infract sizes enables identification of patients with a worse prognosis who benefit from more aggressive therapy and more frequent follow-up visits. "Nowadays many more options exist for STEMI patients deemed at high risk of adverse events, including prescription of ACE inhibitors and insertion of devices like CRT cardiac resynchronisation or ICDs", says Badano.

Speckle tracking echocardiography (STE) is a comparatively new non-invasive echocardiography technique well suited to quantifying infarct size. It works by tracking the movement of natural acoustic markers or "speckles" which are present on standard grey ultrasound tissue images. With the use of wall motion tracking software, speckle movement (and therefore myocardial tissue movement) can be visualised during the cardiac cycle. Speckle-tracking can be used to evaluate myocardial strain, which describes the myocardial deformation throughout the cardiac cycle. Reductions in measurement of strain, have been found to show direct relationships to the size of the infarct.

First use of 3D speckle-tracking to estimate infarct size following STEMI

Measuring circumferential strain with 3D speckle-tracking provides a good predictor of infarct size after STEMI , finds an Italian study¹.

In the study, which presents the first data on use of 3D speckle-tracking in measuring infarct size, Dr Denisa Muraru and colleagues from the University of Padua (Italy), estimated infarct size and necrosis transmurality in patients with recent STEMI, who had undergone successful treatment with primary PCI. One of the advantages of 3D speckle-tracking over 2D, say the authors, is that it allows the assessment of longitudinal (apex-to-base shortening), circumferential (shortening in the circumferential direction); radial strain (myocardialwall thickeningtowards LV cavity center) and area strain (a deformation parameter combining longitudinal and circumferential strain) at the same time. In the study, 49 patients with recent STEMI, successfully reperfused with primary PCI were assessed by 3D speckle-tracking, and the obtained LV strain parameters were compared with peak troponin I levels, as an estimate of the extent of myocardial cell injury. In a multivariable analysis, results showed that only circumferential strain emerged as a significant independent predictor of infarct size. Furthermore, in the subgroup of 27 patients who underwent additional assessment with delayed-enhancement MRI within 24 hours from the echocardiographic study, circumferential strain again showed the closest correlation with infarct size and the best predictive power to identify LV segments with transmural necrosis among all strain components.

"Our preliminary study demonstrates that 3D circumferential strain could be used as an accurate and reproducible marker for infarct size estimation by ultrasound in STEMI patients," says Muraru. Long term follow-up, she adds, will be needed to verify if 3D strain parameters improve the predictive prognostic value of conventional parameters after STEMI.

Study uses 2D speckle tracking to predict infarct size

Longitudinal strain measured early after reperfusion with 2D speckle-tracking may predict infarct size and LV remodelling, concludes a Bulgarian study ².

In the study, Dr Krasimira Hristova and colleagues, from the University National Heart Hospital (Sofia, Bulgaria) investigated the ability of speckle-tracking echocardiography using the vector velocity imaging technique (which measures both the amount of strain and the direction of strain) to determine infarct size.

In the study 30 patients who had PCI for an acute MI within 24 hours and 20 normal volunteers (who had not experienced an event) were assessed with both vector velocity speckle-tracking and intracoronary electrocardiography. The later technique is an established procedure that maps areas of ischemia with guide wires during percutaneous procedures, providing the exact location and size of residual ischemia.

The results showed that in patients who had suffered STEMI radial and circumferential strain decreased in the infarct area , perinfarct area (immediate area around the infarct) and remote regions acutely in comparison with controls; but that longitudinal strain was only decreased in the actual infarct area and not in the perinfarct and remote regions.

"While longitudinal strain shows the best relationship to infarct size, we believe that radial and circumferential strain may be useful to predict the later development of adverse LV remodelling," says Hristova.

In the next part of the study, she adds, they hope to be able to compare their initial results for longitudinal, radial and circumferential strain with the longer term effects on left ventricular remodelling.

EUROECHO & other Imaging Modalities is organised by the European Society of Cardiology (ESC). It is the annual meeting of the European Association of Echocardiography (EAE). The congress will take place from 7 to 10 December 2011 at the Hungexpo, Gate 3, 1101 Budapest Albertirsai út 10, Hungary.

Consult the full scientific programme.

Use the mobile application if you own an Iphone, Ipad or Android. The ESC does not provide press services at the congress, but will arrange interviews and provide support for stories via its press office at press@escardio.org. ESC spokespeople will be available for independent comment on studies presented at the congress.
Journalists wishing to attend the congress will be welcome. Online registration is closed but you can still attend by completing registration formalities at the event itself.
Appointments for interviews on site can be made at the ESC stand number B10 at the congress.

The European Society of Cardiology (ESC) represents more than 71,200 cardiology professionals across Europe and the Mediterranean. Its mission is to reduce the burden of cardiovascular disease in Europe.

References

¹ D. Muraru, M Beraldo, E Solda, et al. Global 3D circumferential strain is related to infarct size and transmural extent of myocardial necrosis in patients with successfully reperfused STEMI. Abstract P283. http://spo.escardio.org/AbstractDetails.aspx?id=101168&eevtid=49

² K Hristova, D Vassilev, P Pavlov, et al. Clinical application of speckletracking echocardiography for assessing of infract size early after reperfusion in patients with acute myocardial infarction. Abstract P966. http://spo.escardio.org/AbstractDetails.aspx?id=101702&eevtid=49

ESC Press Office | EurekAlert!
Further information:
http://www.escardio.org

More articles from Medical Engineering:

nachricht Novel breast tomosynthesis technique reduces screening recall rate
21.02.2017 | Radiological Society of North America

nachricht Biocompatible 3-D tracking system has potential to improve robot-assisted surgery
17.02.2017 | Children's National Health System

All articles from Medical Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Safe glide at total engine failure with ELA-inside

On January 15, 2009, Chesley B. Sullenberger was celebrated world-wide: after the two engines had failed due to bird strike, he and his flight crew succeeded after a glide flight with an Airbus A320 in ditching on the Hudson River. All 155 people on board were saved.

On January 15, 2009, Chesley B. Sullenberger was celebrated world-wide: after the two engines had failed due to bird strike, he and his flight crew succeeded...

Im Focus: Breakthrough with a chain of gold atoms

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

Im Focus: DNA repair: a new letter in the cell alphabet

Results reveal how discoveries may be hidden in scientific “blind spots”

Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...

Im Focus: Dresdner scientists print tomorrow’s world

The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.

The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...

Im Focus: Mimicking nature's cellular architectures via 3-D printing

Research offers new level of control over the structure of 3-D printed materials

Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Booth and panel discussion – The Lindau Nobel Laureate Meetings at the AAAS 2017 Annual Meeting

13.02.2017 | Event News

Complex Loading versus Hidden Reserves

10.02.2017 | Event News

International Conference on Crystal Growth in Freiburg

09.02.2017 | Event News

 
Latest News

Safe glide at total engine failure with ELA-inside

27.02.2017 | Information Technology

Fraunhofer IFAM expands its R&D work on Coatings for protection against corrosion and marine growth

27.02.2017 | Materials Sciences

Stingless bees have their nests protected by soldiers

24.02.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>