Stem Cell Therapy for Heart Failure Reduced Major Cardiac Events and Death – Diagnostic and Interventional Cardiology

November 19, 2021 Stem cell therapy helped to reduce the number of heart attacks, strokes and death among people with chronic, high-risk, NYHA class II or III heart failure with reduced ejection fraction (HFrEF), especially among those who have higher levels of inflammation, yet hospitalization was not reduced, according to late-breaking research presented at the American Heart Associations Scientific Sessions 2021.

Heart failure is a condition when the heart is unable to adequately pump blood to meet the bodys need for oxygen and nutrients. In heart failure with reduced ejection fraction (HFrEF), the heart muscle enlarges and weakens, resulting in a decrease in pumping ability and fluid buildup in the bodys tissues. Inflammation plays a significant role in the progression of heart failure over time.

This study set out to examine the effects of using stem cells (mesenchymal precursor cells) injected into the heart to target inflammation and treat chronic heart failure. Researchers hypothesized that a single injection of stem cells from healthy adult donors in addition to guideline-directed medical therapy (GDMT) for heart failure would affect the number of times participants were hospitalized for heart failure events and reduce heart attacks, strokes, and/or death.

Cell therapy has the potential to change how we treat heart failure, said Emerson C. Perin, M.D., Ph.D., the studys lead author, the director of the Center for Clinical Research and medical director of the Texas Heart Institute in Houston. This study addresses the inflammatory aspects of heart failure, which go mostly untreated, despite significant pharmaceutical and device therapy development. Our findings indicate stem cell therapy may be considered for use in addition to standard guideline therapies.

The Randomized Trial of Targeted Transendocardial Delivery of Mesenchymal Precursor Cells in High-Risk Chronic Heart Failure Patients with Reduced Ejection Fraction study also called the DREAM-HF trial, is the largest stem cell therapy study to date among people with heart failure. In this multi-center, randomized, sham-controlled, double-blind trial, researchers enrolled 537 participants (average age 63, 20% female) with heart failure and reduced ejection fraction, which is when the left side of the heart, its main pumping chamber, is significantly weakened.

Heart failure was defined using the New York Heart Association (NYHA) functional classification system. This classification system places patients in one of four categories based on how much they are limited during physical activity. Class I heart failure means no limitation of physical activity, with class IV heart failure meaning an inability to have any physical activity without discomfort.

Participants were randomly divided into two groups: 261 adults received an injection of 150 million mesenchymal precursor cells, commonly known as stem cells, directly into the heart using a catheter. The remaining 276 adults received a scripted, or sham, procedure. Healthy adult donors provided the mesenchymal precursor cells.

The study participants were discharged from the hospital the day after the procedure, and researchers followed these participants for an average of 30 months. The studys focus was to examine if the stem cell treatment affected the likelihood of participants returning to the hospital for treatment of worsening heart failure. They also tracked whether participants had a heart attack or stroke, or died, and measured levels of high-sensitivity C-reactive protein (CRP), a measure in the blood indicating inflammation.

While researchers did not see a decrease in hospitalizations due to the stem cell treatment, they did notice several other significant results. The findings include:

We were impressed to learn that stem cell treatment effects were additive to current standard heart failure treatments, Perin said. For the first time, the known anti-inflammatory mechanism of action of these cells may be linked to a cause-and-effect benefit in heart failure. The stem cells acted locally in the heart, and they also helped in blood vessels throughout the body.

Perin and colleagues believe further research is needed to better understand how these stem cells may affect the course of progression of heart failure and how these therapies may be directed to the patient groups that could see the most benefits.

Limitations to the research include the selection of endpoints commonly used in heart failure studies. The studys results suggest that traditional endpoints associated with recurrent heart failure hospitalization do not fully reveal the benefits or mechanisms of these stem cells on heart attack, stroke and death in patients with chronic heart failure.

Co-authors are Barry H. Greenberg, M.D.; Kenneth M. Borow, M.D.; Timothy D. Henry II, M.D.; Farrell O. Mendelsohn, M.D.; Les R. Miller, M.D.; Elizabeth Swiggum, M.D.; Eric D. Adler, M.D.; Christopher A. James, P.A.; and Silviu Itescu, M.D. Authors disclosures are listed in the abstract.

The study was funded by Mesoblast Inc.

https://www.dicardiology.com/article/late-breaking-science-presentations-aha-2021-meeting

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Stem Cell Therapy for Heart Failure Reduced Major Cardiac Events and Death - Diagnostic and Interventional Cardiology