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This muscle patch made with human cells can boost heart attack recovery

This is the first large-animal study of muscle patches of a clinically relevant size

IANS  |  New York 

How cardiac arrest is different from a heart attack and heart failure?

Novel heart-muscle patches made with can significantly improve recovery from a attack, results of a clinical trial show.

The results are a step closer to the goal of treating human attacks by suturing over an area of dead muscle in order to reduce the pathology that often leads to failure, said scientists led by Jianyi "Jay" Zhang, Chair of University of Alabama at Birmingham.

In the study, described in the journal Circulation, the team tested human of 1.57 by 0.79 inches in size and nearly as thick as a dime, created in the lab, on large animals in a attack model.

Transplanting two of these patches onto the infarcted area of a pig significantly improved function of the heart's left ventricle, the major pumping chamber.

The patches also significantly reduced infarct size, which is the area of dead muscle, heart-muscle wall stress and heart-muscle enlargement, as well as significantly reducing apoptosis, or programmed cell death, in the scar boarder area around the dead muscle.

Furthermore, the patches did not induce arrhythmia in the hearts -- improper beating of the heart, too fast or too slow.

Each patch was made from a mixture of three cell types -- four million cardiomyocytes, or heart-muscle cells, two million endothelial cells -- known to help cardiomyocytes survive and function in a micro-environment -- and two million smooth muscle cells, which line blood vessels.

Each patch was grown in a three-dimensional fibrin matrix that was rocked back and forth for a week.

The cells begin to beat synchronously after one day.

This mixture of three cell types and the dynamic rocking produced more muscle cells that were more mature, with superior heart-muscle physiological function and contractive force.

The patches resembled native heart-muscle tissue in their physiological and contractile properties, the scientists noted.

First Published: Sat, January 13 2018. 15:16 IST
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