Renal artery stenosis and occlusion as a cause of potentially curable arterial hypertension have been the subject of numerous investigations. Other changes in the extrarenal part of the renal arteries, such as a decrease in calibre or tapering of these vessels in a distal direction have received comparatively little attention. THOMA (1893) observed that the calibre of blood vessels appears to vary with the local blood flow. Investigations of renal arteries have revealed a correlation between the 'renal area' as determined from roentgenograms obtained by the ellipsoid surface formula (MOELL 1956, LUDIN 1961), kidney weight at autopsy and renal plasma flow estimated from the PAH clearance or renal blood flow (Table 1). Correlation 1 (Table 1) agrees largely with the investigation of KITTREDGE et call. (1964). The size of the variance about the regression line in correlation 1 (Table 1) may in part be due to a variable discrepancy between the renal plasma flow and renal blood flow. It has not been possible to estimate the magnitude of the latter since neither haematocrit values nor the extraction ratio were determined. It is, however, noteworthy

Significance of alterations in main renal artery calibre and configuration.

Aortographic determination of an increased resistance of the renal blood circulation in diffuse glomerulonephritis

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Aortographic determination of an increased resistance of the renal blood circulation in diffuse glomerulonephritis