Ouch! According to research published in the December issue of the Journal of Internal Medicine, the risk of having a heart attack is 60% higher just a year after a patient is diagnosed with rheumatoid arthritis,
Swedish researchers followed 7,469 patients diagnosed with rheumatoid arthritis (RA) between 1995 and 2006, together with 37,024 matched controls without RA to determine the risk of ischaemic heart disease, with particular reference to myocardial infarction. The maximum follow-up was 12 years and the median was just over four years.
“Our findings emphasise the importance of monitoring a patient’s heart risk from the moment they are diagnosed with rheumatoid arthritis, as the risk rises rapidly in the first few years” said lead author Marie Holmqvist from the Karolinska Institute, according to a press release.
Among the key findings were that:
- Average age at diagnosis was just under 57 years and 71% of the patients with RA were women. The median time from the appearance of RA symptoms to diagnosis was 6.2 months.
- 67% of the patients had a positive rheumatoid factor (RF). The difference in increased heart attack risk between the RF positive and negative subgroups was not statistically significant 70% higher in RF positive patients and 60% higher in RF negative patients.
- Having RA increased the risk of any ischaemic heart disease by 50% one to four years after diagnosis, staying at that level in years five to 12. The risk increased during the first year after diagnosis, but did not reach statistical significance for 12 months.
- The risk of an acute heart attack rose by 60% one to four years after diagnosis, remaining at the same level in years five to 12. Again, the level increased in year one, but was not statistically significant for the first 12 months.
“Our study confirms the increased risk of heart disease and heart attacks that patients with RA face” Holmqvist said, according to a press release. “However it also adds three important observations to previous research.”
The observations are:
- The increased heart attack risk was apparent very soon after RA diagnosis, despite the fact that the median duration of symptoms before diagnosis was just over six months.
- Although RA has been caught earlier and treated more aggressively in the last decade, increased heart attack risks were still seen in patients diagnosed in the last five to 10 years.
- Both rheumatoid factor positive and rheumatoid factor negative were associated with an increased heart attack risk.
“Our research underlines the importance of clinicians monitoring patients diagnosed with rheumatoid arthritis for an increased risk of heart problems, in particular heart attacks” Holmqvist said. “It is also very clear that more research is needed to determine the mechanisms that link these two health conditions.”
Sources: Wiley – Blackwell, AlphaGalileo Foundation