How middle-age hypertension raises dementia risk later
London, June 13: A high blood pressure level but still below the usual threshold for treating hypertension can put 50-year-olds at increased risk of developing dementia later, revealed a study led by an Indian-origin researcher.
According to the American Heart Association, normal blood pressure is below 120/80 mmHg.
People with a systolic blood pressure (the top number) of 130 mmHg or more at the age of 50 had a 45 per cent greater risk of developing dementia than those with a lower level at the same age.
The risk was 47 per cent even in people with no heart or blood vessel-related conditions.
"Our work confirms the detrimental effects of midlife hypertension for risk of dementia," said lead author Archana Singh-Manoux, Professor at the French National Institute of Health and Medical Research (INSERM) in Paris.
The reason for the increased risk of dementia includes the fact that high blood pressure is linked to silent or mini strokes (where symptoms often are not noticeable), damage to the white matter in the brain, which contains many of the brain's nerve fibres, and restricted blood supply to the brain.
This damage may underlie the resulting decline in the brain's processes, the researchers explained in the study of nearly 9,000 people, published in the European Heart Journal.
However, the association was not seen at the ages of 60 and 70, and diastolic blood pressure (the bottom number) was not linked to dementia.
"Our analysis suggests that the importance of mid-life hypertension on brain health is due to the duration of exposure," the researcher said.
"So we see an increased risk for people with raised blood pressure at age 50, but not 60 or 70, because those with hypertension at age 50 are likely to be 'exposed' to this risk for longer," she added.
Another study reported in the journal Cardiovascular Research showed that higher risk of developing dementia in hypertensive patients occurs due to significant alterations in three specific white matter fibre-tracts linked to executive functions, processing speed, memory and related learning tasks -- brain areas associated with dementia.
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Make polling hours 6am-7pm for May 7 LS polls, Karnataka BJP urges EC citing heatwave
Bengaluru, May 3: Citing the ongoing heatwave in the state, Karnataka BJP on Friday petitioned the Election Commission with a request to modify the polling hours to the 6am-7pm period in the 14 parliamentary constituencies in the state that goes to polls on May 7.
Polling is currently scheduled to be held in the second phase in the state in 14 segments in the northern districts between 7am to 6pm on May 7.
"It has become hard to come out and vote between hours 10.00 to 17.00 due to uncontrollable heat. The average heat in those parts (north Karnataka) covering 14 parliamentary constituencies are between 37 and 42 degree (Celsius). The mercury is rising at an alarming level and it would become hard for the electors to come out and vote," BJP's petition said.
The petition highlighted the alarming rise in temperatures, which are expected to go beyond 40 degree Celsius, and also stated that the number of voters over the age of 40 is high and that they are vulnerable to the heatwave.
"To keep up the good spirit of voting, necessary action should be taken," the BJP petition urged the Election Commission, saying, "In this background, it is requested to modify the time of voting in the 14 parliamentary constituencies from 06.00 to 19.00 hours on May 7".
Polling was held between 7 am and 6 pm during Karnataka's first phase of the Lok Sabha polls in 14 constituencies on April 26.
