It is very common that, after sitting for a while and get up quickly, we suffer from slight dizziness causes dementia and that feeling of numbness and heaviness in the head that is so annoying. People who feel light-headed or dizzy when getting up may experience a sudden drop in blood pressure called orthostatic hypotension . A new study by the academic journal of the American Academy of Neurology notes that middle-aged people who suffer from such blood pressure drops may have a higher risk as dizziness causes dementia or stroke .
Orthostatic hypotension had already been related to heart problems , fainting and falls but the new research, led by Dr. Andreea Rawlings of the Johns Hopkins Bloomberg School of Public Health , seeks to determine if this form of low blood pressure is related to brain problems, specifically dementia . For the correct performance of the study, it was established that low blood pressure would be considered when there was a minimum decrease of 20 millimeters of mercury (mm-Hg) in the systolic blood pressure , when the heart contracts to produce a heartbeat; or 10 mm-Hg in diastolic blood pressure when the heart is at rest Normal blood pressure is less than 120/80 mm-Hg .
The study was conducted with 11,709 people with an average age of 54 years followed by a group with an average age of 25 years. The participants met up to five times with the researchers during the study. None of them had a history of heart problems or strokes at the beginning of the study.
During the initial examination, participants were evaluated for orthostatic hypotension. They were instructed to lie down for 20 minutes and then rise with a fluid and rapid movement . Blood pressure was measured five times when standing up. The researchers determined the average of the readings and calculated the difference with respect to the average blood pressure of the participants at rest. It was determined that 522 participants, 4.7% , had orthostatic hypotension at the beginning of the study.
Researchers monitored participants during the study for dizziness causes dementia or stroke with visits and reviewing medical records. During the study, 1,068 people developed dementia and 842 people suffered an isthmic stroke, which happens when blood flow is blocked in part of the brain . It was observed that those participants who had orthostatic hypotension at the beginning of the study had a 54% higher risk of developing dementia than the others. A total of 999 of the 11,156 participants without orthostatic hypotension ( 9%)) developed dementia, compared with 69 of 552 subjects with orthostatic hypotension ( 12.5% ).
In addition, those suffering from orthostatic hypotension were twice as likely to suffer isthermal stroke . A 15.2%, or 84 552 persons, with orthostatic hypotension experienced a istrémico stroke; compared to 758 of 11,157 people ( 6.8% ). No relationship was observed with blood effusions.
“Measuring orthostatic hypotension in middle-aged people can be a new way to identify people who need careful control of dementia or stroke, ” says Rawlings. “More studies are needed to clarify the cause of this relationship, as well as to investigate new prevention strategies .”