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Survival with treated and well-controlled blood pressure: findings from a prospective cohort study
Debbie A Lawlor1, Lois Kim, Richard Morris
1MRC Centre for Causal Analyses in Translational Epidemiology, School of Social and Community Medicine, University of Bristol, Bristol, United Kingdom. d.a.lawlor@bristol.ac.uk
Insights
Half of older adults have untreated hypertension, increasing their risk of cardiovascular disease. Even treated hypertension poses risks if not well-controlled, highlighting the need for better management strategies to prevent heart disease.
Area of Science:
- Cardiology
- Public Health
- Epidemiology
Background:
- Hypertension is a major risk factor for cardiovascular disease (CVD).
- Effective blood pressure management is crucial for reducing CVD incidence.
- Prevalence and control of hypertension in older adults require further investigation.
Purpose of the Study:
- To compare survival and incident CVD among different hypertension control groups.
- To assess risks associated with untreated, poorly controlled, and well-controlled hypertension.
- To evaluate CVD outcomes in older adults based on their hypertension status.
Main Methods:
- Utilized data from the British Regional Heart Study and British Women's Heart and Health Study (N=6476).
- Assessed blood pressure and treatment status at baseline (1998-2001) in adults aged 60-79.
- Followed participants for a median of 8 years, tracking mortality and non-fatal CVD events.
Main Results:
- Nearly half of participants had untreated hypertension (52% women, 49% men).
- Poorly controlled (22% women, 18% men) and untreated hypertension significantly increased CVD risk.
- Well-controlled hypertension also showed an increased CVD risk (HR 1.38), though less pronounced after adjustments.
Conclusions:
- A high prevalence of untreated hypertension exists in older British adults.
- Inadequate control of treated hypertension contributes to elevated cardiovascular disease risk.
- Hypertension, regardless of treatment status, is linked to increased CVD risk compared to normotensive individuals.
Aim:
To compare survival and incident cardiovascular disease between normotensive, untreated hypertensive, treated and poorly-controlled hypertensive and treated and well-controlled hypertensive adults.
Methods And Results:
Data from the British Regional Heart Study (men) and British Women's Heart and Health Study (women) were used (N = 6476). Blood pressure and treatment were assessed at baseline (1998-2001) when participants were aged 60-79 years and participants were followed up for a median of 8 years. Date and cause of death were obtained from death certificates and non-fatal cardiovascular disease events were obtained from repeat detailed medical record reviews. Of the whole cohort 52% of women and 49% of men had untreated hypertension and a further 22% and 18%, respectively, had poorly treated hypertension. Just 3% of women and 4% of men had treated and well controlled hypertension and 23% and 29%, respectively, were normotensive. Compared to normotensive individuals, incident cardiovascular disease (fatal and non-fatal) was increased in those with poorly-controlled hypertension (Hazard Ratio (HR): 1.88; 95%CI: 1.53, 2.30), those with untreated hypertension (HR 1.46; 95%CI 1.22, 1.75) and those who were well-controlled hypertension (HR 1.38; 95%CI 0.94, 2.03). Adjustment for baseline differences in mean blood pressure between the groups resulted in attenuation of the increased risk in the poorly-controlled (1.52 (1.18, 1.97) and untreated groups (1.21 (0.97, 1.52), but did not change the association in the well-controlled group. All-cause mortality was also increased in all three hypertension groups but estimates were imprecise with wide confidence intervals.
Conclusions:
Half of women and men aged 60-79 in Britain had untreated hypertension and only a very small proportion of those with diagnosed and treated hypertension were well controlled. Those with hypertension, irrespective of whether this was treated and controlled or not, were at greater risk of future cardiovascular disease than those who are normotensive.
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