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Query: UMLS:C0085580 (essential hypertension)
 14,686 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

1. The ratio between ankle (ASP) and brachial (BSP) systolic pressures was studied using Doppler ultrasound in 66 male subjects, 33 with sustained uncomplicated essential hypertension and 33 age-matched normal controls. 2. Based on covariance analysis, the ASP-BSP relationship was significantly different in the two populations, the ASP/BSP ratio (mean +/- SEM) being significantly lower in hypertensive subjects (106 +/- 1 vs 132 +/- 2; P less than 0.001). 3. While the ASP/BSP ratio was negatively correlated with age in normal subjects, no significant correlation was observed in hypertensive subjects. 4. The diameter of the terminal abdominal aorta measured by echography was significantly greater in hypertensive subjects, while full examination with Doppler ultrasound excluded any significant arterial stenosis of the lower limbs. 5. The study suggested that, in patients with sustained uncomplicated essential hypertension, the lower ASP/BSP ratio is related to changes in arterial wave transmission.
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PMID:The ratio between ankle and brachial systolic pressure in patients with sustained uncomplicated essential hypertension. 327 42

The main objective of the present work was to study modifications in RBC aggregate morphology by analyzing digitized microscopic images and compare them between healthy subjects and patients suffering from essential hypertension. Blood samples were obtained from normal subjects (n=30) and patients suffering from essential hypertension (n=20). RBC aggregate morphology was quantified using direct microscopic observation and numerical analysis of images. ASP (Aggregation Shape Parameter) defined as the ratio of the area of the projected image to its square perimeter was calculated. Other rheological parameters have been determined in order to establish the hemorheological profile of the studied hypertension states. ASP appears significantly higher (p<0.001) in patients suffering essential hypertension (0.69+/-0.11) than in normal control subjects (0.25+/-0.12). RBC aggregation is known to be responsible for the high increase in apparent blood viscosity at low shear rates. By compare ASP values with whole blood viscosity at low rate (2.30 s(-1)) a high correlation was formed between both parameters (Spearman coefficient was 0.8835 and p<0.001). The applied method is simple, direct and quantitative and provides a useful tool for measuring deviations of RBC aggregate morphology.
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PMID:Comparative analysis of aggregate shapes by digitized microscopic images. Application to hypertension. 1208 45