Navigation Links
Cutting Off Blood Flow to Heart Cuts Damage During Heart Attack
Date:2/26/2010

Repeatedly inflating blood pressure cuff led to 30 percent reduction in lost tissue, study found

FRIDAY, Feb. 26 (HealthDay News) -- Cutting off the flow of blood to the heart by repeatedly inflating a blood pressure cuff appears to reduce the amount of tissue damaged during a heart attack, a new Danish study shows.

In a study of 142 patients being rushed to a hospital for treatment of severe heart attacks, the amount of heart tissue saved for those who got the treatment, called induced ischemia, was 30 percent greater than for those who didn't, according to a report in the Feb. 27 issue of The Lancet.

"For patients being transported to the hospital for acute myocardial infarction [heart attack], we inflated the blood pressure cuff for five minutes, relaxed it and repeated it four times," said study author Dr. Hans Erik Botker, a professor of cardiology at Aarhus University Hospital in Skejby.

While the initial results appear promising, induced ischemia is not being used routinely, Botker said. "We have demonstrated cardioprotection by decrease of the infarct [damaged heart muscle]," he explained. "But this is a surrogate marker. The question is whether it translates into clinical benefit for the patient. We have shown improvement during hospitalization, but it was not sustained for more than 30 days. Now, we need to follow more patients for longer times to clarify whether there is clinical benefit."

The induced ischemia trial is the latest in a long series of studies, first in animals and now in humans, which started with the observation that brief stoppages of blood flow can improve the ability of an organ to withstand stress, Botker said. He and his colleagues have been working with the technique since 2002, with animal experiments followed by trials in people undergoing bypass surgery and now the heart attack trial.

More studies are needed to determine whether the procedure reduces the incidence of congestive heart failure and death, Botker said. "To be honest, we need these clinical endpoints," he said. "To show that the therapy translates into clinical benefit, that is the next step."

Most of the work on induced ischemia is being done in Europe. In the United States, a group led by Jacob Vinten-Johansen, a professor of cardiothoracic surgery at Emory University in Atlanta, has been trying a variation on the theme, in which blood flow is interrupted by inflating the balloon on a catheter, the thin wire inserted for the artery-opening procedure called angioplasty.

"We were the first to try it, in 2003," Vinten-Johansen said. "We did a series of pilot studies simulating models of myocardial infarction. We did find it beneficial and went through the litany of what would be rational and effective. Essentially, in a nutshell, a little bit of ischemia can be helpful and a little bit of reperfusion can be helpful."

The beauty of the technique is its simplicity, Vinten-Johansen said, but there are complexities within the simplicity. While one small human trial is under way at Emory, "we still are looking at preclinical work, what makes it tick, what are the mechanisms," he said. "We want to answer some questions about why this thing is doing what it is doing."

So far, there have been only small human trials of induced ischemia, generally in single medical centers in Europe, Vinten-Johansen said. "The U.S. cardiology community is a bit slower to embrace these things, and the regulatory situation is better in Europe," he explained.

U.S. regulations require signing of a consent form for such an experimental procedure, "and that is difficult when the patient is in an ambulance coming into the hospital," said Dr. Ajay J. Kirtane, an interventional cardiologist at New York-Presbyterian Hospital/Columbia Medical Center.

Caution about the technique is advisable because "particularly for patients with acute heart attacks, many interventions have shown promise in single-center trials but have not had the same effect in multi-center trials," Kirtane said.

But induced ischemia does have appeal, he said. "If you can consistently have the same kind of outcome these doctors have observed, that is pretty exciting," Kirtane said.

A report in the Feb. 26 online edition of The Lancet described a study led by British researchers that found that surgery to remove blockages in the carotid artery, the main blood vessel to the brain, is safer and better at preventing a stroke than implanting a stent, a thin metal tube, to improve blood flow.

More information

Current heart attack treatments are described by the American Heart Association.



SOURCES: Hans Erik Botker, M.D., professor, cardiology, Aarhus University Hospital, Skejby, Denmark; Jacob Vinten-Johansen, Ph.D, professor, cardiothoracic surgery, Emory University, Atlanta; Ajay J. Kirtane, M.D., interventional cardiologist, New York-Presbyterian Hospital/Columbia Medical Center, New York City; Feb. 27, 2010, The Lancet


'/>"/>
Copyright©2010 ScoutNews,LLC.
All rights reserved

Related medicine news :

1. Over 500,000 Health Care Providers Now Cutting Costs, Saving Time Through CAQH Administrative Simplification Initiative
2. Cutting Salt Wont Affect Foods Safety
3. Prize for Cutting-Edge Laser Innovations
4. Fern Tree, The Spa at Half Moon, Jamaicas Premier Spa, Opens With Ceremonial Ribbon Cutting
5. The era of global aging: GSA showcases cutting-edge San Francisco meeting topics
6. Cutting Edge CyberKnife Cancer Treatment Center to Open in Tampa Bay Area
7. Financial incentives may hold key to cutting child malaria deaths
8. FDA Mulls Cutting Salt in Processed Foods
9. New Democracy Corps Battleground Poll of Swing Districts Finds Strong, Bi-Partisan Opposition to Cutting Medicare-Funded Nursing Home Care
10. Cutting caffeine may help control diabetes
11. Verizon teams with MCG to test cutting-edge technology
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:10/13/2017)... ... October 13, 2017 , ... The International Association ... standards of excellence for the field of eating disorders, announces the opening of ... 2018 in Orlando, Florida at the Omni Resort at ChampionsGate. , ...
(Date:10/13/2017)... ... 13, 2017 , ... Many families have long-term insurance that covers care for ... a waiver for care if the client has a cognitive impairment diagnosis. , ... care, is often waived, so the benefits from their insurance start immediately,” said Mechell ...
(Date:10/13/2017)... (PRWEB) , ... October 13, 2017 , ... ... will be giving viewers the lowdown on sciatica in a new episode of ... that focuses on current events and innovation and investigates each subject in-depth with ...
(Date:10/12/2017)... (PRWEB) , ... October 12, 2017 , ... ... are now treating sleep apnea using cutting-edge Oventus O2Vent technology. As ... serious sleep disorder characterized by frequent cessation in breathing. Oral appliances can offer ...
(Date:10/12/2017)... ... ... Asante, a nationally recognized health system in southern Oregon, ... health joint venture through an agreement, effective October 1, 2017, to create AccentCare ... company with Asante, delivering clinically integrated care, for the past eight years. This ...
Breaking Medicine News(10 mins):
(Date:10/10/2017)...  NDS received FDA 510(k) clearance in May 2017 for its ... specifically designed for endoscopy environments. An innovative secondary monitor solution, ZeroWire ... to support the improvement of patient outcomes, procedural efficiency, and the ... ... ...
(Date:10/4/2017)... Oct. 4, 2017  South Korean-based healthcare product Development ... aide "cprCUBE" on Kickstarter. The device will educate the ... arrests with better efficiency compared to the dated and ... feedback on efficacy of the compression for a more ... a goal to raise $5,000. ...
(Date:10/2/2017)... 2017  Eli Lilly and Company (NYSE: ... third quarter of 2017 on Tuesday, October 24, 2017. ... day with the investment community and media to further ... call will begin at 9 a.m. Eastern time. Investors, ... webcast of the conference call through a link that ...
Breaking Medicine Technology: