Related Experiment Videos
Ischaemic heart disease: association with haematocrit in the British Regional Heart Study
G Wannamethee1, A G Shaper, P H Whincup
1Department of Public Health, Royal Free Hospital School of Medicine, London.
Insights
High haematocrit levels (≥46.0%) significantly increase the risk of major ischaemic heart disease events by 30% in men. This finding highlights haematocrit as a potential factor in heart disease development.
Area of Science:
- Cardiovascular Medicine
- Hematology
Background:
- Ischaemic heart disease (IHD) is a leading cause of mortality globally.
- Understanding risk factors for IHD is crucial for prevention strategies.
Purpose of the Study:
- To investigate the association between haematocrit levels and the incidence of major ischaemic heart disease events.
- To determine if elevated haematocrit is an independent risk factor for IHD.
Main Methods:
- Prospective cohort study involving 7735 men aged 40-59.
- Follow-up period of 9.5 years across 24 UK general practices (British Regional Heart Study).
- Assessed fatal and nonfatal ischaemic heart disease events in relation to baseline haematocrit.
Main Results:
- A haematocrit level of ≥46.0% was associated with a significant 30% increased relative risk (RR=1.32) of major IHD events.
- This association persisted after adjusting for multiple cardiovascular risk factors including age, smoking, BMI, cholesterol, and pre-existing IHD.
- Further adjustment for systolic blood pressure slightly reduced but did not negate the significant risk (RR=1.27).
Conclusions:
- Elevated haematocrit (≥46.0%) is a significant independent risk factor for major ischaemic heart disease events in middle-aged men.
- Increased haematocrit may play a role in the pathogenesis of IHD.
- These findings suggest haematocrit could be a valuable biomarker for cardiovascular risk assessment.
Objectives:
To assess the relationship between haematocrit and risk of major ischaemic heart disease events.
Design:
Prospective study of a cohort of men followed up for 9.5 years.
Setting:
General practices in 24 towns in England, Wales, and Scotland (British Regional Heart Study).
Subjects:
Altogether 7735 men aged 40-59 years at screening, who were selected at random from one general practice in each of 24 towns, were studied.
Main Outcome Measures:
Fatal and nonfatal ischaemic heart disease events.
Results:
Risk of major ischaemic heart disease events was significantly increased at haematocrit levels of > or = 46.0%. Men with raised haematocrit (> or = 46.0%) showed a 30% increase in relative risk (RR) of major ischaemic heart disease events (RR = 1.32; 95% confidence intervals (CI) 1.10,1.57, p < 0.01) compared with those with values below 46.0%, even after adjustment for age, social class, smoking, body mass index, physical activity, blood cholesterol, lung function (FEV1), and pre-existing evidence of ischaemic heart disease. Further adjustment for systolic blood pressure reduced the risk slightly (RR = 1.27; 95% CI 1.06,1.51, p = 0.02) but it remained significant. The relationship was seen in men with and without pre-existing evidence of ischaemic heart disease. The study suggests that an increased haematocrit level plays a part in the development of major ischaemic heart disease events.