Haematocrit: a predictor of cardiovascular mortality?
OBJECTIVES. The main purpose of the study was to assess a possible association between haematocrit (Hct) and long-term cardiovascular disease (CVD) mortality. DESIGN. An extensive examination programme was carried out in 2014 men, defined as apparently healthy, during the period 1972 to 1975, including Hct measurements in a 25% random subsample. Sequential, cause-specific mortality was followed prospectively over a period of 16 years. SETTING. The survey was conducted at Medical Department B, Rikshospitalet, Oslo, Norway. SUBJECTS. The participants represented 86% of all eligible apparently healthy men working in five preselected companies in Oslo. INTERVENTIONS. No intervention was given by the study group during follow-up. MAIN OUTCOME MEASURES. Complete, cause-specific mortality figures after 8-16 years were obtained from the Norwegian Central Bureau of Statistics. RESULTS. Hct measures were obtained in 488 men (24.2%). Mean Hct was 47.2% (SD 2.9%). After correcting for differences in age, plasma cholesterol, systolic blood pressure, erythrocyte sedimentation rate and smoking habits (Cox proportional hazards model), an increase in Hct by 2 SDS was associated with an increase in CVD mortality by a factor ranging between 2.9 at 10, and 1.9 at 16 years (P < 0.05). A similar increased risk was observed earlier during follow-up but the number of deaths was too small for meaningful statistical analysis. No association was found between Hct and non-CVD mortality. CONCLUSIONS. Our data show that increased Hct is associated with an increased risk of dying from CVD--independent of conventional CVD risk factors.[1]References
- Haematocrit: a predictor of cardiovascular mortality? Erikssen, G., Thaulow, E., Sandvik, L., Stormorken, H., Erikssen, J. J. Intern. Med. (1993) [Pubmed]
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