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Kidney function and systolic blood pressure new insights from cystatin C: data from the Heart and Soul Study

Carmen A Peralta1, Mary A Whooley, Joachim H Ix

  • 1General Internal Medicine Section, San Francisco Veterans Affairs Medical Center, and Department of Medicine, University of California, San Francisco, San Francisco, California 94124, USA. carmenalicia.peralta@ucsf.edu

American Journal of Hypertension
|September 1, 2006
PubMed

Insights

Systolic blood pressure and pulse pressure are linked to kidney function across a broad range, even in those with normal kidney function. Cystatin C offers new insights into hypertension control in chronic kidney disease (CKD).

Area of Science:

  • Nephrology
  • Cardiology
  • Hypertension Research

Background:

  • Hypertension control is critical for managing chronic kidney disease (CKD).
  • Previous studies explored kidney function and blood pressure (BP) in diagnosed CKD, diabetes, or hypertension.
  • The association between normal kidney function and BP components remains unclear.

Purpose of the Study:

  • To investigate the relationship between kidney function and systolic blood pressure (SBP), diastolic blood pressure (DBP), and pulse pressure.
  • To evaluate kidney function using cystatin C and 24-hour creatinine clearance (CrCl).

Main Methods:

  • Utilized data from 906 participants in the Heart and Soul Study.
  • Assessed kidney function via cystatin C and 24-hour creatinine clearance (CrCl).
  • Analyzed associations between kidney function markers and BP components (SBP, DBP, pulse pressure).

Main Results:

  • SBP showed a linear association with cystatin C across all kidney function levels.
  • SBP was significantly linked to kidney function (CrCl<60 mL/min) but not in those with CrCl>60 mL/min.
  • Diastolic blood pressure (DBP) was not associated with cystatin C or CrCl.
  • Pulse pressure linearly correlated with cystatin C and with CrCl<60 mL/min.

Conclusions:

  • Both SBP and pulse pressure are significantly associated with kidney function across a wide range of cystatin C levels.
  • These associations hold true even in individuals with seemingly normal kidney function by creatinine-based measures.
  • Cystatin C may offer novel perspectives on the CKD-hypertension link, potentially highlighting an overlooked barrier to BP management.
Abstract

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