Brain May Benefit by Lowering Blood Pressure
Treatment May Stop or Slow a Type of Brain Abnormality, Study Shows
Sept. 7, 2005 -- Getting blood pressure under control is good for the brain, new research shows.
Health experts already knew that curbing blood pressure can help avoid strokes, heart attacks, and other serious health problems.
Now, French doctors report that lowering blood pressure may halt or slow the progression of brain abnormalities called white matter hyperintensities (WMH). Their study appears in Circulation.
WMH and High Blood Pressure
WMH are white areas in the brain. They're strongly linked to high blood pressure. WMH may be accompanied by dementia, depression, and trouble with walking.
"People with high blood pressure are more likely to develop WMH, and a larger volume of WMH are associated with cognitive decline, an increased risk of dementia, and accelerated brain aging in some hypertensive patients," says Christophe Tzourio, MD, PhD, in an American Heart Association news release.
Tzourio works in Paris at INSERM, France's national institute for health and medical research. With colleagues, he studied WMH and blood pressure treatment.
Brain and Blood Pressure Study
The study included 192 people. Participants were about 60 years old, on average. Most were men. All had had a stroke or "mini-stroke" (transient ischemic attack, or TIA) in the past five years.
At the study's start, about half of the group had high blood pressure. MRI brain scans showed that 42% had no WMH, 13% had moderate WMH, and 19% had severe WMH.
About a third of the group got medicine to treat their high blood pressure. They either got an ACE inhibitor and a diuretic (water pills) or just the ACE inhibitor. The rest of the patients got a fake drug (placebo).
About three years later, more brain scans were done. The results:
- 24 people had developed new WMH.
- People taking blood pressure medicines were 43% less likely to have new WMH than those taking the placebo.
- New WMH were smaller in patients taking the blood pressure medicines.
The results didn't change after factoring in age, sex, stroke type, blood pressure at the study's start, or WMH severity when the study began.
As expected, blood pressure dropped more with the prescription medicines than with the placebos.