According to researchers, a drug commonly used for short-term treatment of worsening heart failure in hospitalized patients may cause dangerously low blood pressure and abnormal heart rhythms. //The findings suggest that the drug, milrinone, should be reserved for patients who do not respond to other medication, said Dr. Mihai Gheorghiade of Northwestern University.

According to Gheorghiade, the study is one of the few to compare a placebo with a drug for worsening heart failure, a condition that sends about 1 million Americans to the hospital each year. Despite the poor results, it shows that such studies can and should be done on similar drugs.

An accompanying editorial says the use of other drugs commonly used in worsening heart failure, dopamine and dobutamine, should be reconsidered given the milrinone findings, since all three drugs work similarly to strengthen the heartbeat.

Heart failure, in which the heart gradually loses its ability to pump blood efficiently, affects nearly 5 million Americans. The condition may be chronic, but patients can develop severe attacks of breathing difficulty that require hospitalization.

Dr. Ann Bolger, an American Heart Association spokeswoman, said patients studied were generally less sick than those who typically would be given milrinone. The study shows ``there really isn't any advantage'' to giving milrinone to patients who are not acutely ill, Bolger said.

Sanofi-Synthelabo Inc., which markets milrinone in the United States, funded the study. The company's Web site warns that the drug may cause irregular heartbeats, and says milrinone should be stopped if blood pressure falls too low. It also says that the drug may not be safe or effective when given for longer than 48 hours, and that long-term oral treatment has been linked with an increased risk of hospitalization and death.

Another JAMA study shows favorable results for a newer drug called Natrecor, app
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