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The effect of hypertension on the apparent diffusion coefficient values of kidneys

Erkan Yildirim1, Hakan Güllü, Mustafa Calişkan

  • 1Department of Radiology, Başkent University School of Medicine, Ankara, Turkey. drerkany@yahoo.com

Diagnostic and Interventional Radiology (Ankara, Turkey)
|February 29, 2008
PubMed
Abstract

Insights

This study found that diffusion magnetic resonance imaging (dMRI) did not detect renal microvascular dysfunction in patients with hypertension. Apparent diffusion coefficient (ADC) values remained unaffected by blood pressure levels, suggesting preserved renal microvascular function.

Area of Science:

  • Nephrology
  • Radiology
  • Cardiovascular Medicine

Background:

  • Hypertension is a leading cause of chronic kidney disease, often associated with microvascular damage.
  • Early detection of renal microvascular dysfunction is crucial for timely intervention and management.
  • Diffusion magnetic resonance imaging (dMRI) offers a non-invasive method to assess tissue microstructure.

Purpose of the Study:

  • To investigate the utility of renal diffusion magnetic resonance imaging (dMRI) in diagnosing hypertension-induced renal microvascular dysfunction.
  • To determine the correlation between blood pressure levels and apparent diffusion coefficient (ADC) values in the kidneys.
  • To assess whether hypertension impacts renal microvascular function as measured by ADC.

Main Methods:

  • Seventy-seven patients were categorized into normotensive, pre-hypertensive, stage 1 hypertensive, and stage 2 hypertensive groups.
  • All participants underwent diffusion-weighted multi-section echo-planar MRI to generate transverse ADC maps.
  • Regions of interest were placed in the renal cortex, and ADC values were calculated at varying b values; MR angiography excluded renal artery stenosis.

Main Results:

  • No statistically significant differences in age were observed between the patient groups.
  • There was no significant correlation found between kidney ADC values and blood pressure levels across all groups (P > 0.05).
  • Renal ADC values in patients with microalbuminuria were comparable to those without (P > 0.05).

Conclusions:

  • Despite potential end-organ damage from hypertension, renal microvascular function appears preserved.
  • Hypertension, within the studied range, did not significantly alter renal apparent diffusion coefficient (ADC) values.
  • Renal diffusion MRI, as applied in this study, may not be sensitive enough to detect early microvascular changes in hypertension.

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