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At-Home Monitoring Works for People on Blood Thinners

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July 6, 2000 -- People who take blood-thinning medications to prevent clots may be able to safely skip some of those repeated trips to the doctor to have their blood checked. A new study finds that patients who monitor their own blood-clotting time and drug dosing at home do just as well as those who have it done by a doctor or lab.

In a study published in the medical journal The Lancet, Dutch researchers found there was virtually no difference between patients who managed their own care at home and those who had it done at a clinic. In some ways, the patients who monitored themselves at home did better than the ones seen at a clinic, and most of them preferred self-treatment.

The most common blood thinner is called Coumadin, and it is taken to prevent blood clots in patients at risk for having a stroke, heart attack, or blood clot in the leg or other part of the body. People taking Coumadin usually go to the doctor to have blood drawn to test their blood's clotting time every few weeks to make sure they are taking the correct dose of medicine. Taking too much Coumadin increases the risk of excessive bleeding, and too little medicine does not protect against clots.

Home management of blood-thinner therapy may give patients more control over their treatment and result in improved compliance in taking the Coumadin, according to study author Manon Cromheecke, MD, of the department of cardiopulmonary surgery at the University of Amsterdam in the Netherlands, and colleagues.

The researchers theorized that since easy and reliable monitoring devices have become available for home use, this might allow patients to take a more active role in their care. They divided 50 patients into two groups. One group monitored their blood levels at home and made their own adjustments in their medication, while the other group had the monitoring done at a specialized clinic. At the end of three months, the groups switched places. The patients who had received care at the clinic now monitored their blood at home, and vice versa.

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