Rheumatoid Arthritis Raises Heart Failure Risk
RA Patients Have Twice the Risk of Heart Failure, Study Shows
Feb. 3, 2005 -- Rheumatoid arthritis is a significant risk factor for heart failure.
Researchers at the Mayo Clinic find that rheumatoid arthritis (RA) doubles the risk of heart failure. Their report is in February's Arthritis & Rheumatism.
In heart failure, the heart muscle doesn't pump as much blood as the body needs. The heart still beats, but it's not working effectively. Many studies have linked heart failure to chemicals related to inflammation. These inflammatory chemicals are important in diseases such as RA, an autoimmune and progressively chronic disease that is caused by an immune system malfunction, which promotes inflammation.
After taking into account risk factors for heart failure, the researchers wanted to see if RA promotes inflammation. They knew that heart problems have been called an underlying cause of a "substantial proportion" of deaths among RA patients.
Heart failure raises the risk of heart disease death by four- to 18-fold, say Paulo Jorge Nicola, MD, and colleagues. They estimate that heart failure strikes 2.4% to 5.5% of the general population over age 65.
In RA, joints become inflamed. Over time, the inflammation can damage the joints, even causing disability. Imaging studies have indicated that people with RA have signs of heart failure.
RA Doubled Heart Failure Risk
The researchers followed 575 rheumatoid arthritis patients and 583 people without rheumatoid arthritis for 12-15 years. Researchers also examined their medical records, starting when the participants were 18 years old.
Each RA patient was compared with a participant without RA of the same age and gender. Most (73%) were women about 57 years old. In general, RA affects women twice as often as men and usually starts between age 40 and 60.
At the start of the study no one had heart failure. But by the study's end, heart failure had developed in 165 RA patients and 115 without RA. That's 34% of the RA patients and 25% of those without RA.
After taking into account risk factors that can increase the risk of developing heart failure, the study showed that RA was associated with almost twice the risk of developing heart failure.
"We observed that patients with RA have twice the risk for the development of congestive heart failure when compared to subjects without RA," write the researchers.