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Repeat exercise renograms in hypertension identify persistent renal dysfunction

J H Clorius1, T Hupp, A Mandelbaum

  • 1German Cancer Research Center, University of Heidelberg, Germany.

Journal of Hypertension
|January 1, 1995
PubMed
Summary
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Exercise renography in hypertensive patients reveals reproducible kidney abnormalities during physical activity. These findings suggest a fixed, repeatable disturbance linked to hypertension, potentially contributing to its persistence.

Area of Science:

  • Nephrology
  • Nuclear Medicine
  • Cardiovascular Medicine

Background:

  • Hypertension is associated with bilateral para-aminohippurate analogue trapping in kidney tissue during exercise.
  • This phenomenon, detectable via radioactively labeled tracers like [131I]-hippurate or [99mTc]-mercaptoacetyl-triglycine, results in a characteristic bilateral-abnormal exercise renogram.
  • This exercise-induced renal disturbance affects nearly 60% of hypertensive individuals, irrespective of the underlying cause.

Purpose of the Study:

  • To ascertain if bilateral-abnormal exercise renograms represent genuine findings or are artifacts.
  • To evaluate the reproducibility of exercise renography results in hypertensive patients.

Main Methods:

  • Review of renographic examinations from 27 hypertensive patients.

Related Experiment Videos

  • Each patient underwent at least one resting and two exercise renograms using [131I]-hippurate or [99mTc]-mercaptoacetyl-triglycine.
  • Documentation of renal artery status, vascular lesion causes, revascularization procedures, and antihypertensive medication at the time of scintigraphy.

    • Main Results:

    • Exercise renograms demonstrated high reproducibility over an average of 15.5 months, with 24 out of 27 patients showing comparable results.
    • Re-evaluation identified potential interpretation errors due to intermittent pelvic retention in two cases with divergent results.
    • Neither revascularization nor changes in antihypertensive drug therapy impacted exercise renography outcomes.

    Conclusions:

    • Exercise renography results are reproducible over extended periods.
    • The exercise-mediated renal disturbance appears fixed to the kidneys and can be repeatedly reactivated.
    • This reproducible, exercise-induced renal abnormality likely has a direct relationship with hypertension and may contribute to its maintenance.