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Glucose may support in Cardiac Arrest

According to a reasonably new research, it was observed that giving most heart attack patients an infusion of glucose soon after they come to the hospital could dramatically improve their chances of survival. The Dutch study found that supplementing regular treatment of heart attacks with the extra fuel reduced the risk of dying //within a month from 4% to 1.5%, but only for patients whose hearts had not suffered substantial damage in the attack.

Researchers suggested that the study's findings were preliminary. Dr. Lars reasonably, a professor of cardiology at the Karolinska Institute in Stockholm, ``The time of follow-up is probably too short to draw firm conclusions,'' who was not involved with the research.

When heart muscle is damaged, the metabolism in the heart increases and the cells need a lot more glucose, their main fuel, to stay alive. The infusion includes insulin, which is needed to transport the glucose into the cell. However, insulin also causes a flux of potassium into cells, which depletes the levels in the blood. Potassium is therefore added to the infusion to compensate for that effect.

In the 1950s and 1960s, several studies investigated the prospect of boosting fuel to the heart with infusions of glucose, insulin and potassium. However, the evidence was inconclusive and doctors were left confused. Also, it has never been tested in combination with today's standard therapies. Those involve trying to get rid of the clot that caused the heart attack either by widening the arteries with instruments or dissolving the clot with drugs.

The latest study involved 900 patients treated at the De Weezenlanden Hospital in Zwolle in the Netherlands. Half the patients also got an infusion of the high-dose glucose mixture. They got about 4.1 pints of the fluid intravenously over 8 hours.

Overall, the death rate over the next 30 days was about the same in the two groups - about 10 percent. However, the res ults significantly improved when restricted to the 90 percent of patients who had not suffered severe damage or heart failure. Only 10 people who got the infusion were dead 30 days later, compared with 18 in the group who didn't get the tonic.

Dr. Felix Zijlstra, a cardiology professor who led the research said that these data show that at least we should take it seriously. ``Metabolic intervention seems to have a future - on top of other therapy and provided they don't have heart failure.''

About three quarters of people who have a heart attack have no signs of heart failure. While experts were encouraged by the glucose findings, they appeared to give up on another infusion for heart patients that had once shown promise - magnesium.

A number of small studies conducted on humans in the 1980s suggested magnesium reduced deaths. But a large study in 1993 failed to find a benefit. However the larger study left open the possibility magnesium could be helpful if given sooner after an attack and to people with a worse prognosis - such as the elderly or people who couldn't have their arteries widened or receive clot-busting drugs. The U.S. National Heart, Lung and Blood Institute funded a Harvard Medical School study of more than 2,000 patients in 12 countries to answer that question.

The findings, presented at the Berlin meeting, showed that magnesium infusions were useless for such patients. Fifteen percent of the patients died in the month after their heart attacks, regardless of whether they had had the magnesium infusion. ``I think magnesium is now dead in the water,'' said Rory Collins, an Oxford University epidemiologist who was not connected with the study.


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