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Introduction. The sign of the hyperdense middle cerebral artery (MCA) evaluated by simple tomography allows predicting ischemic cerebrovascular disease (ICD) with occlusion of a large vessel, however, it is common to identify this sign in residents with high hemoglobin levels without symptoms of ICD. Objectives. To evaluate the correlation between the radiodensity of the MCA and the hemoglobin level in patients with and without ICD, residing in a high-altitude city. Methods. Analytical observational study, including people residing in Cusco (located at 3300 masl) who attended the emergency service and underwent a brain tomography, presenting or not ICD symptoms. ACM radiodensity was measured and correlated with the hemoglobin level. Results. 279 patients were included, the average hemoglobin was 15.1 and standard deviation (DE) of 2.5 mg/dL, in the controls a significant correlation was ...

Objective: We aimed to determine the correlation between blood viscosity and cerebral blood flow in people acclimated to chronic hypoxia who have high blood viscosity levels. Materials and methods: A Prospective observational study was conducted in asymptomatic young adults living in Cusco (3399 m altitude). All participants were examined at low and high shear rates (75 and 300 s−1) for simulating the dynamic component of blood viscosity. A transcranial Doppler study of the middle cerebral artery was performed to measure systolic, diastolic, and mean flow velocities (FVs), as well as resistance and pulsatility indexes (PIs). Results: One hundred and thirty-one participants were included. Median viscosity levels were 5.01cP (interquartile range [IQR]: 4.45–5.73cP) at 300 s−1 and 6.16 cP (IQR: 5.58-7.20 cP) at 75 s−1, mean FV was 57 cm/s (IQR: 50–65 cm/s), and the PI was 0.91 (0....