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Utility of BNP in differentiating constrictive pericarditis from restrictive cardiomyopathy in patients with renal

Proddutur R Reddy1, Robert S Dieter, Pranab Das

  • 1Loyola University Medical Center, Department of Medicine, Division of Cardiology, Maywood, Illinois 60153, USA.

Journal of Cardiac Failure
|October 10, 2007
PubMed

Insights

Brain natriuretic peptide (BNP) levels are less reliable for distinguishing constrictive pericarditis (CP) from restrictive cardiomyopathy (RCMP) in patients with impaired kidney function. Renal insufficiency significantly impacts BNP

Area of Science:

  • Cardiology
  • Nephrology
  • Diagnostic Biomarkers

Background:

  • Differentiating constrictive pericarditis (CP) from restrictive cardiomyopathy (RCMP) presents clinical challenges due to similar presentations.
  • Brain natriuretic peptide (BNP) is a potential noninvasive biomarker for differentiating CP and RCMP.
  • The utility of BNP in patients with renal insufficiency remains unevaluated.

Purpose of the Study:

  • To evaluate the clinical utility of BNP in differentiating CP from RCMP in patients with varying degrees of renal function.

Main Methods:

  • Consecutive patients with suspected CP or RCMP were enrolled.
  • BNP levels, renal function (estimated by Cockcroft-Gault formula), and comorbidities were recorded.
  • Hemodynamic data were obtained via transseptal catheterization in most patients.
  • Statistical analyses included descriptive statistics, Student t-test, and Mann-Whitney U test.

Main Results:

  • Twenty-two patients had confirmed CP or RCMP.
  • In CP patients, elevated BNP was observed in those with renal insufficiency (Stage II+) compared to those with normal renal function (433 vs. 116 pg/mL, P = .016).
  • BNP levels in CP patients with normal renal function were significantly lower than in RCMP patients (116 vs. 728 pg/mL, P = .005).

Conclusions:

  • Brain natriuretic peptide (BNP) demonstrates reduced clinical utility for differentiating constrictive pericarditis from restrictive cardiomyopathy in the setting of renal insufficiency.
  • Renal function significantly influences BNP levels, potentially confounding diagnostic interpretation.
Abstract

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