Key result
High hemoglobin concentrations (≥14 g/l) were associated with an increased risk of ischemic stroke compared to levels <13 g/l (RR 3.2; 95% CI 1.4-7.4; P<0.01 for linear trend).
Why the study?
Does high hemoglobin concentration increase the risk of ischemic stroke in adults aged 30-69 years?
Case-Control (n=286)
Does high hemoglobin concentration increase the risk of ischemic stroke in adults aged 30-69 years?
Relative Risk: 3.2 (95% CI 1.4–7.4)
p-value: p=<0.01
Higher hemoglobin concentrations are associated with a dose-dependent increased risk of ischemic stroke.
May inform stroke risk stratification; leaves open whether hemoglobin modification alters incidence in observational data.
We examined the relationship between the hemoglobin concentration and the risk of ischemic stroke using data from a hospital-based case-control study. A total of 143 patients (age 30-69 years) with a diagnosis of cerebral infarction confirmed by computerized tomography scan and 143 age- and sex-matched controls entered the study. Hemoglobin was higher in the patients with stroke (14.2 +/- 1.6 g/l, mean +/- SD) than in controls (13.7 +/- 1.6 g/l; p < 0.05). Compared with subjects with hemoglobin levels of less than 13 g/l (reference category), the relative risk of ischemic stroke, after allowance for potential risk factors, was 2.0 (95% CI 0.8-4.9) for the 13-13.9 g/l quartile, 2.8 (95% CI 1.2-6.5) for the 14-14.9 g/l quartile, and 3.2 (95% CI 1.4-7.4) for the 14 + g/l quartile (chi 2 for linear trend 7.27, p < 0.01). We conclude that the hemoglobin concentration may be an indicator of risk for ischemic stroke.
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Mascio et al. (2008) conducted a case-control in Ischemic stroke (n=286). High hemoglobin concentration vs. Hemoglobin <13 g/l was evaluated on Ischemic stroke (RR 3.2, 95% CI 1.4-7.4, p=<0.01). High hemoglobin concentrations (≥14 g/l) were associated with an increased risk of ischemic stroke compared to levels <13 g/l (RR 3.2; 95% CI 1.4-7.4; P<0.01 for linear trend).
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