Navigation Links
Seasonal variation in blood pressure
Date:1/16/2009

A French study reported in the 12th January issue of Archives of Internal Medicine has found a strong correlation between blood pressure and outdoor temperature in a large sample of the elderly.(1) As a result, the investigators advise that, during periods of extreme temperatures, careful monitoring of blood pressure and antihypertensive treatment "could contribute to reducing the consequences of blood pressure variations in the elderly".

The study, which monitored 8801 participants over the age of 65 in the French Three-City study, found that systolic and diastolic blood pressure values differed significantly across the four seasons of the year and according to the distribution of outdoor temperature. The higher the temperature, the greater the decrease in blood pressure. Systolic blood pressure, for example, decreased with increasing temperature, with an 8.0 mmHg decrease between the lowest ( < 7.9C) and the highest (21.2C) temperatures. Average systolic blood pressure was 5 mmHg higher in winter than in summer. High blood pressure, defined as a systolic blood pressure of 160 mmHg or higher, or a diastolic blood pressure of 95 mmHg or higher, was detected in 33.4 per cent of participants during winter and 23.8 percent during summer. These changes in blood pressure were greater in subjects 80 years or older than in younger participants.

Participants' blood pressure was measured at the beginning of the study (starting in 1999) and again about two years later. Outdoor temperatures on the day of measurement were obtained from local meteorological offices. Participants in the Three-City study were from Bordeaux, Dijon and Montpellier.

"Although our study does not demonstrate a causal link between blood pressure and external temperature, the observed relationship nevertheless has potentially important consequences for blood pressure management in the elderly," the authors state. "Because the risk of stroke or aneurysmal rupture is highest in the elderly, improved protection against these diseases by close monitoring of blood pressure and antihypertensive medication when outdoor temperature is very low could be considered."

Speaking on behalf of the European Society of Cardiology (ESC), Professor Frank Ruschitzka from the University Hospital, Zurich, says that the study reaffirms the place of the elderly as a target group for blood pressure monitoring. "The elderly, especially the increasing number of octogenarians, should not be neglected. They need extra care, and will benefit from monitoring and appropriate treatment. This study emphasises the need for year-round vigilance."

One possible explanation for the study findings, adds Professor Ruschitzka, lies in the emerging link between vitamin D and blood pressure. The elderly, especially those in care homes, are subject to vitamin D deficiency, largely as a result of their limited exposure to sunlight, and vitamin D deficiency can predispose to hyptertension via activation of the renin-angiotensin-aldosterone system. "The benefit of sunlight on vitamin D levels in the elderly is under appreciated," says Professor Ruschitzka. "Fifteen minutes exposure to sunlight can produce the equivalent of 2000 international units vitamin D."

A report from the Framingham Heart Study published in 2008 found that moderate vitamin D deficiency nearly doubles the risk of myocardial infarction, stroke and heart failure over a mean of 5.4 years in patients with high blood pressure.(2) The Nurses Health Study, also reporting in 2008, found that lower blood levels of vitamin D are independently associated with an increased risk of hypertension; women with the lowest levels had a 66 per cent higher incidence of hypertension than those with the highest levels.(3)


'/>"/>

Contact: ESC Press Office
press@escardio.org
33-049-294-8627
European Society of Cardiology
Source:Eurekalert

Related medicine news :

1. Ronald McDonald House Charities Brings People Together Like Never Before with First-Ever, Multi-Channel Social Networking Campaign : Charity Finds New Ways to Encourage Seasonal Giving in Tough Economic Times
2. Gene Mutation May Cause Some Cases of Seasonal Affective Disorder
3. New Treatment Options for Seasonal Affective Disorder, from Harvard Mental Health Letter
4. Brains Serotonin May Explain Seasonal Mood Changes
5. PET scans help identify mechanism underlying seasonal mood changes
6. Luxury Resort Operates Seasonal Green Market for 2,300 Staff
7. Study provides new understanding of forces behind seasonal flu virus evolution
8. Seasonal Flu Outbreaks Start in Asia: Study
9. Seasonal Safety Tips for Older Adults
10. Lack of Light and Seasonal Depression - Whats the Link? From the Harvard Health Letter
11. Watson Confirms Patent Litigation With Barr Related to Seasonale(R)
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/23/2017)... Braunfels, TX (PRWEB) , ... March 23, 2017 , ... ... new clinic, located at 960 Gruene Road in Building 2. The clinic is the ... Dr. Andrew Bennett, PT, says opening the company’s second New Braunfels location brings things ...
(Date:3/23/2017)... PA and Grimsby, Ontario (PRWEB) , ... March 23, 2017 , ... The MBI “Hall ... modular industry or whose acts have had a significant impact on the careers of all ... and Marketing with NRB Inc. was inducted into the MBI’s Hall of Fame. The ...
(Date:3/23/2017)... Austin, TX (PRWEB) , ... March 23, 2017 , ... ... fist-sized organs that pack a punch when it comes to maintaining good health. Every ... every 30 minutes, your kidneys filter every drop of your blood, eliminating waste, regulating ...
(Date:3/23/2017)... Angeles, CA (PRWEB) , ... March 23, 2017 ... ... A funding investment in Los Angeles based healthcare technology company California Healthcom Group ... portfolio into the US, and healthcare arena. With headquarters in California, CHG is ...
(Date:3/23/2017)... ... March 23, 2017 , ... Michael Lanteri ... the greater Fort Collins area, has unveiled a collaboration with nonprofit Big Bones ... Donations to this worthy cause may now be made at http://bigbonescaninerescue.com/ . ...
Breaking Medicine News(10 mins):
(Date:3/23/2017)... INDIANAPOLIS , March 23, 2017  Eli ... the William Sansum Diabetes Center have established a research ... by diabetes through enhanced research, education and care. ... disease bears a disproportionate weight on Latino families in ... David Kerr , M.D., FRCPE, director of Innovation and ...
(Date:3/23/2017)... DIEGO and VANCOUVER, British Columbia ... (NASDAQ: SPHS ) (the "Company" or "Sophiris"), ... the treatment of urological diseases, today announced that data ... evaluated the drug as a focal treatment for localized ... March 26, 2017 at the 32 nd Annual ...
(Date:3/23/2017)...  Interpace Diagnostics Group, Inc. (NASDAQ: ... company that provides clinically useful molecular diagnostic tests ... entered into agreements to successfully restructure its secured ... concurrently terminate its royalty and milestone obligations. ... RedPath amounting to $9.34 million is being acquired ...
Breaking Medicine Technology: