Category Archive for: ‘Blood pressure’

Cardiovascular risk factors and dementia

Cardiovascular risk factors also associated with dementia

The risk factors – smoking, serum cholesterol, blood pressure, lung function and the presence of CVD at baseline – were associated with death from dementia. The risk was 58% greater for heavy compared to non-smokers, 55% greater for hypertensives compared to those with normal blood pressure, 73% greater for those with a high level of serum cholesterol, 46% lower for those with a high compared  to a low lung function and 94% greater for those with a history of CVD at baseline compared to those with no such history. Men with a combination of two of the risk factors had a 2 times greater risk of death from dementia. These results suggest that that cardiovascular risk factors measured in midlife predict the risk of death with dementia.

Cardiovascular risk factors measured in the Seven Countries Study

Cardiovascular risk factors were measured at baseline and 160 out of 10,211 middle-aged men died from dementia during 40 years of follow-up. The results of the SCS suggest that cardiovascular risk factors affect the neurodegenerative process leading to dementia.

References

Smoking and cardiovascular disease

Smoking increases CHD risk

When the Seven Countries Study started in 1958 the prevalence of smokers was very high and ranged from 44% in Belgrade professors in Serbia to 78% in fisherman from Ushibuka in Japan. The 10-year follow-up data showed that smoking was associated with a higher risk of CHD mortality in countries where there were enough events for analysis and the strongest associations were observed in northern Europe where CHD was highest. An analysis using the 25-year CHD mortality data showed similar results.  

Smoking a long-term predictor of CVD

The Finnish cohorts showed that the relative risk of CHD mortality among cigarette smokers compared to non-smokers decreased the longer the follow-up, but the excess CHD risk remained significant after 35 years of follow-up.

The 40-year data from the Zutphen Study showed that cigarette smokers at entry had a 59% higher CHD and a 66% higher CVD mortality risk compared to non-smokers. The duration as well as intensity of smoking was also independently predictive of CVD mortality.

References

Blood pressure and cardiovascular disease

Blood pressure a strong predictor of CVD mortality

Systolic blood pressure in middle-aged men was an important predictor of 10-, 25-, 35- and 40-year CHD mortality in all cohorts. The 35-year follow-up data showed that past blood pressure levels are more important than recent values. Systolic blood pressure was also strongly associated with 25-, 35- and 40-year stroke mortality. Both recent and past blood pressure level were strongly predictive of stroke. The Zutphen Study found that the strength of the relation between blood pressure and 15-year stroke incidence doubled when 11 repeated casual pressures were measured. Blood pressure was also strongly related to 40-year total CVD mortality in the US railroad cohort.

Population differences in absolute CHD risk

Systolic blood pressure and 25-year CHD mortality

The results after 10 and 25 years of follow-up showed that the relative risks from blood pressure level are similar across cohorts, while at the same level of blood pressure the absolute risks of CHD mortality are different. High absolute risk was present in Northern Europe and the United States and low risk in Mediterranean Southern Europe and Japan.

Implication

Relative risk of CHD associated with blood pressure is similar but absolute risk differs among the cohorts. This implies that elevated blood pressure levels need to be treated more intensely in high risk cultures to achieve target levels and potential prevention.

References

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Country Trends

Explore the graphs with trends in CVD risk factors across time and cultures.

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