Doubts cast over effectiveness of bone marrow treatment for heart failure

   Mar 25, 4:15 pm

Washington, Mar 25 (ANI): Using patient's bone marrow cells for treating chronic ischemic heart failure did not result in improvement on most measures of heart function, a new study has revealed.

Cell therapy has emerged as an innovative approach for treating patients with advanced ischemic heart disease, including those with heart failure.

"In patients with ischemic heart disease and heart failure, treatment with autologous [derived from the same individual] bone marrow mononuclear cells (BMCs) has demonstrated safety and has suggested efficacy. None of the clinical trials performed to date, however, have been powered to evaluate specific efficacy measures," according to background information in the article.

Emerson C. Perin, M.D., Ph.D., of the Texas Heart Institute and St. Luke's Episcopal Hospital, Houston and colleagues conducted a study to examine the effect of transendocardial administration (use of a special catheter and injection procedure to deliver stem cells to the heart muscle) of BMCs to patients with chronic ischemic heart disease and left ventricular (LV) dysfunction with heart failure and/or angina.

The patients in the phase 2 randomized trial were receiving maximal medical therapy at 5 National Heart, Lung, and Blood Institute-sponsored Cardiovascular Cell Therapy Research Network (CCTRN) sites between April 2009 and April 2011.

Patients were randomized to receive transendocardial injection of BMCs or placebo.

The primary outcomes measured for the study, assessed at 6 months, were changes in left ventricular end-systolic volume (LVESV) assessed by echocardiography, maximal oxygen consumption, and reversibility of perfusion (blood flow) defect on single-photon emission tomography (SPECT).

Of 153 patients who provided consent, a total of 92 (82 men; average age: 63 years) were randomized (n = 61 in BMC group and n = 31 in placebo group).

Analysis of data indicated no statistically significant differences between the groups for the primary end points of changes in LVESV index, maximal oxygen consumption, and reversible defect.

There were also no differences in any of the secondary outcomes, including percent myocardial defect, total defect size, fixed defect size, regional wall motion (the movement of the wall of the heart during contraction), and clinical improvement.

In an exploratory analysis, the researchers did find that when LVEF was assessed, patients age 62 years or younger showed a statistically significant effect of therapy.

Patients in the BMC group demonstrated an average increase in LVEF of 3.1 percent from baseline to 6 months, whereas patients in the placebo group showed a decrease of -1.6 percent.

"In the largest study to date of autologous BMC therapy in patients with chronic ischemic heart disease and LV dysfunction, we found no effect of therapy on prespecified end points," the authors wrote.

"Further exploratory analysis showed a significant improvement in LVEF associated with treatment. Our findings provide evidence for further studies to determine the relationship between the composition and function of bone marrow product and clinical end points.

"Understanding these relationships will improve the design and interpretation of future studies of cardiac cell therapy," the authors added.

The study has been published in JAMA. (ANI)

'Pheromones' in air unite male and female moths Oct 22, 2:11 pm
Washington, Oct 22 (ANI): Researchers have recently studied male moths process of detecting their female partners miles away with the help of 'pheromones' in the air.
Full Story
Circuits for signals at 140 GHz makes world record Oct 22, 1:53 pm
Washington, Oct 22 (ANI): A Swedish research team have made a world record by creating a new type of microwave circuit for fewer cords, smaller antennas and quicker video transmission.
Full Story
Vegetarian dino 'Stegosaurus' used sharp tail as deadly weapon Oct 22, 11:45 am
Washington, Oct 22 (ANI): A new research has revealed that Stegosaurus dinosaurs, who were mostly portrayed as plant eaters, were also lethal fighters and used their spiky tails to fight against their enemies.
Full Story
Lightest fingertip touch can help people maintain balance on feet Oct 22, 10:51 am
Washington, Oct 22 (ANI): A new study had shown that even the slightest of support can help people to maintain their balance.
Full Story
Comments

LATEST STORIES
TOP VIDEO STORIES
PHOTO GALLERY