A recent cross-sectional study of 1,487 patients (868 men and 619 women) found that those with silent cerebral infarction (silent stroke) had significantly higher whole blood viscosity than those who did not. Additionally, patients with high blood viscosity had a higher prevalence of silent cerebral infarction (SCI), even after adjusting for confounding variables. SCI results from a brain lesion that is usually caused by an occlusion of a cerebral blood vessel. While a patient with a silent cerebral infarction does not present any noticeable symptoms, pathological damage often results, placing the patient at increased risk of future transient ischemic attack or major stroke. Li et al. concluded their study by stating, "Whole blood viscosity at low shear rate is a novel indicator for SCI regardless of classical cardiovascular risk factors. Early measurement of whole blood viscosity may be helpful to assess the risk of stroke."