Middle-aged females with restless legs syndrome (RLS) have a 6% to 41% increased risk of having high blood pressure compared to other women - the risk is linked to the severity and frequency of their RLS, researchers from Brigham and Women's Hospital and Harvard Medical School reported in the journal Hypertension: Journal of the American Heart Association.
Hypertension (high blood pressure) is one of the major risk factors for heart disease and stroke. The authors wrote that millions of people in the USA and worldwide with RLS have a significantly raised risk for hypertension. At least 5 million individuals in America are thought to have moderate to severe restless legs syndrome, and an unknown number have milder forms of the condition.
Salma Batool-Anwar, MD, MPH and team stress that further studies are needed to confirm their findings.
Even though they see an association, they cannot at the moment say that one (RLS) causes the other (hypertension).
Restless legs syndrome, also known as RLS is a disorder in which patients have an uncontrollable urge to move their legs. Often there is a strange and unpleasant sensation in their legs. The only form of relief is to move the limbs. Patients have used the following words when the sensation in their legs builds up, triggering the urge to move them: tingling, tugging, itching, electric shocks, creeping, crawling, burning, and/or aching. In some cases, the arms are affected too.
RLS symptoms tend to become worse and more frequent in the evening and after going tobed,
and improve in the morning.
RLS is twice as common in females as males. Symptoms onset tends to occur during middle age or later, but can occur at any age.
RLS frequently affects sleep quality. Patients, especially those with severe symptoms, commonly suffer from fatigue during the day, as well as depression, and other problems linked to poor quality sleep and insomnia.
The authors explained that prior studies had found an association between RLS and a higher chance of developingheart
attack or stroke. However, other studies found no link.
Over three-quarters of RLS patients also suffer from PLMD (periodic limb movement disorder). The individual's leg jerks and twitches uncontrollably every 10 to 60 seconds, usually during sleep. PLMD is considered a kind of sleeping disorder. The sufferer wakes up many times during the night. PLMD has been linked to higher blood pressure and heart rate (pulse rate).
Salma Batool-Anwar and team set out to determine what impact RLS might have on blood pressure. They gathered data from the Nurses Health Study II, which included details on over 65,500 female nurses. Their average age was 50 years. They
whether they had RLS, how often it affected them and what their symptoms were like. They also gave information on their blood pressure readings.
, such as age, smoking, and obesity. They found that restless legs syndrome wasassociation
with a 6% to 41% higher probability of suffering from hypertension.
The authors found that:
26% of females with 5 to 14 RLS episodes each month suffered from hypertension
33% of those with over 15 episodes per month had hypertension
21% of those with no RLS had hypertension
The authors concluded:
"Women with restless legs syndrome have a higher prevalence of hypertension, and this prevalence increases with more frequent restless legs symptoms."