Stem Cells in the Treatment of Heart Failure MyHeart
By Dr. Matthew Watson
The use of stem cells in the treatment of heart failure cases is currently being investigated. Cardiovascular disease is the #1 killer in the United States accounting forone third ofall deaths.Heart disease kills more people than cancer, HIV, diabetesor trauma. Many advances in medical and surgical treatment of heart disease have contributed to a growing number of patients in their 70s and 80s with congestive heart failure. An estimated 1% of the Western world has congestive heart failure, including over 5 million Americans with an additional 550,000 new cases each year. Patients with advanced heart failure who require hospitalization, have a 50% mortality within the first fiveyears.
The patients with significant coronary artery disease can sometimes undergo coronary artery bypass surgery or percutaneous coronary intervention to open up blocked arteries. In addition, current medical treatment of patients with congestive heart failure include proven beneficial medicine such as beta-blockers, ACE inhibitors, angiotensinIIreceptor blockers, angiotensin IIreceptor blocker Neprilysin inhibitors and diuretics. When appropriate, resynchronization of the right and left ventricles can be accomplished with special types of pacemaker. However, even after following all of these guideline proven therapies, some patients still run out of options and continue to have severe and debilitating congestive heart failure. Heart transplant is a last resort for end stage heart disease.There is a very low number of donor hearts and transplant programs have very restricted eligibility criteria leaving a large number patients with very few options.
An example of a normal LV-gram.
An example of a normal echocardiogram.
There are reasons to believe that regenerative therapy could really help patients with congestive heart failure. Multi-potent cardiac stem cells exist in the heart and participate in the normal turnover of heart muscle cells and small blood vessels.A heart attack kills heart muscle which is made of millions of heart cells. The question is: Would regenerative therapy be able to replace those heart cells or cardiac myocytes?
Thousands of patients have been enrolled in clinical trials to address this question. Regenerative or stem cell therapy has been shown to be safe. Modest benefits have been demonstrated but the mechanism has not been completely elucidated. So far, there is no evidence that cells regenerate from the transplanted stem cells. Animal studies have shown that only 1% of the stem cells injected into the heart tissue are detectable after 1 month. The clinical benefits observed appeared to be due to arelease of growth factors which triggers endogenous repair of the heart cells and inhibits cell death and fibrosis resulting in increased performance of the heart muscle.
An example of an abnormal LV-gram.
An example of an abnormal echocardiogram.
Adult stem cells derived from the bone marrow of healthyyoung donors have been used in clinical trials of heart failure. In the Dream-HF clinical trial, we are using immuno-selected mesenchymalstem cells from healthy adult allogeneic donors. The cells are obtained from their bone marrow, expandedin a manufacturing facility and arecryopreserved until use. These cells are shipped to clinical sites and used for the study.
Allogeneic mesenchymal stem cells have been evaluated in multiple nonclinical and clinical studies, several of which were initiated by Mesoblast, the phase 3 study sponsor. Therapeutic indications under evaluation included heart failure, myocardial infarction, rheumatoid arthritis and graft versus host disease. Currently, results from clinical studies suggest that allogeneic stem cells are generally well tolerated. Moreover,in a phase 2 study ofpatients with heart failure, mesenchymal precursor cell therapy was associated withimprovement inreduction in heart failure hospitalization events and improvementsin functional exercise capacity.
Stem cells from healthy normal volunteers are administered as a 1 time dose of 150 million cells. Myocardial locations are defined within the left ventricle byLeft Ventriculogram (LV-gram)imaging and electromechanical mapping as viable for cell delivery. The cells are administered via a trans-endocardial injection at 15-20 sites inside the heart cavity using a Myostar injection catheter and a NOGA cardiac mapping system. Dr Mendelsohn is the interventional cardiologist performing the injections at BBH Princeton hospital. Only he knows which patients received the stem cells, and he doesnt follow them. The other heart failure specialists follow the patients in the research clinic.
The patients that are injected with stem cells are compared to a group of patient who undergo a Sham or placebo treatment. The treatment arm is not known to the patient or to the heart failure specialist such as myself. This is the only way to find out whether the treatment with stem cells really works. All the patients will be followed by their study team and will be monitored for the clinical effects of stem-cell treatment in patients with congestive heart failure.
No matter how many cases of congestive heart failure we treat, I am still captivated by each and every persons story. One such patient, is a young lady that was treated for heart failure and had a defibrillator placed in 2009. She sought our help and was inquiring about stem cell treatment for her heart. She was only in her early 40s and was desperate to try something new. She was on maximal medical therapy and did not qualify at that time because she was stable. In 2015 however, a clinical deterioration lead to several cardiac procedures including ablation of ventricular arrhythmias and an upgrade of her pacemaker/defibrillator. I thought we were going to lose her. At some point, she was going into incessant ventriculartachycardias and required several prolonged hospitalizations. We referred her to a transplant center and she was evaluated by the transplant team. At the same time, she enrolled in our stem cell research Dream-HF program at the end of 2015.Because she is still part of the research study, I am not sure whether she received stem cells or not. She is amongst one of the many patients that are participating ina stem cell research program that is evaluating cutting edge technology in heart failure. The Dream-HF study is still enrolling patients with chronic systolic heart failure of either ischemic or nonischemic etiology.
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Stem Cells in the Treatment of Heart Failure MyHeart
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