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Coronary flow reserve in idiopathic dilated cardiomyopathy: relation with left ventricular wall stress, natriuretic

Frank Lloyd Dini1, Lorenzo Ghiadoni, Umberto Conti

  • 1Unità Malattie Cardiovascolari 2, Santa Chiara Hospital, Pisa, Italy. f.dini@ao-pisa.toscana.it

Journal of the American Society of Echocardiography : Official Publication of the American Society of Echocardiography
|March 10, 2009
PubMed

Insights

Idiopathic dilated cardiomyopathy (IDCM) impairs coronary blood flow reserve (CBFR). Left ventricular wall stress and N-terminal pro-brain natriuretic peptide levels predict CBFR reduction in heart failure patients.

Area of Science:

  • Cardiology
  • Cardiovascular Physiology

Background:

  • Impaired coronary blood flow reserve (CBFR) is documented in idiopathic dilated cardiomyopathy (IDCM).
  • Understanding the mechanisms behind CBFR reduction in IDCM is crucial for patient management.

Purpose of the Study:

  • To investigate the underlying mechanisms of reduced CBFR in IDCM patients using Doppler ultrasound.
  • To identify predictors of CBFR reduction in heart failure secondary to IDCM.

Main Methods:

  • Evaluated 48 stable IDCM patients (NYHA classes 1-3) using echocardiography and Doppler techniques.
  • Assessed CBFR via the ratio of hyperemic to resting coronary diastolic peak velocities (using dipyridamole).
  • Measured N-terminal pro-brain natriuretic peptide (Nt-pro-BNP) and brachial artery flow-mediated dilation (FMD).

Main Results:

  • Left ventricular (LV) wall thickness-to-cavity radius showed the strongest correlation with CBFR (r = 0.77, P < .0001).
  • Log-transformed Nt-pro-BNP levels strongly correlated with CBFR (r = -0.64, P < .0001).
  • LV wall thickness-to-cavity radius, NYHA class, and Nt-pro-BNP were independent predictors of CBFR (cumulative R² = 0.82, P < .0001). FMD did not correlate significantly with CBFR.

Conclusions:

  • LV end-diastolic wall stress, assessed by LV wall thickness-to-cavity radius, is a key determinant of CBFR in IDCM.
  • Plasma Nt-pro-BNP levels provide valuable information regarding CBFR in heart failure patients with IDCM.
  • These non-invasive measures can help assess CBFR in IDCM, guiding clinical decisions.

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