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Changes in renal function during physical and mental effort.

S Ghione1, E Fommei, L Palla

  • 1C.N.R. Clinical Physiology Institute, Pisa, Italy.

Clinical and Experimental Hypertension. Part A, Theory and Practice
|January 1, 1987
PubMed
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Essential hypertension patients show reduced renal uptake of Tc99m-DMSA during physical and mental stress. This suggests potential reductions in kidney blood flow under stressful conditions in hypertensive individuals.

Area of Science:

  • Nephrology
  • Nuclear Medicine
  • Cardiovascular Research

Background:

  • Essential hypertension is a common condition affecting kidney function.
  • Understanding renal responses to stress is crucial for managing hypertension.
  • Non-invasive radioisotopic methods offer a way to assess kidney function.

Purpose of the Study:

  • To evaluate renal responses to physical and mental stress in essential hypertension.
  • To assess changes in Technetium-99m dimercaptosuccinic acid (Tc99m-DMSA) uptake rate.
  • To investigate the impact of stress on renal blood flow in hypertensive patients.

Main Methods:

  • A non-invasive radioisotopic method using Tc99m-DMSA was employed.
  • Renal uptake rates were measured in 10 essential hypertension subjects.

Related Experiment Videos

  • Gamma-camera imaging and time-activity curves assessed kidney uptake pre- and post-stress.

    • Main Results:

    • Tc99m-DMSA uptake rate increased regularly in non-stimulated conditions.
    • Both isometric exercise and mental effort caused an abrupt reduction in uptake rate.
    • Uptake rate recovered after the cessation of stressful stimuli.

    Conclusions:

    • Stressful conditions, including physical and mental exertion, may reduce renal blood flow in essential hypertension.
    • Tc99m-DMSA uptake rate can serve as an indicator of renal hemodynamic changes during stress.
    • Further research is needed to fully elucidate the relationship between DMSA uptake and renal function in hypertension.