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Prognostic value of left-ventricular and peripheral vascular performance in patients with dilated cardiomyopathy

Tonino Bombardini1, Edoardo Nevola, Assuero Giorgetti

  • 1Consiglio Nazionale Ricerche (CNR), Institute of Clinical Physiology, Pisa, Italy.

Journal of Nuclear Cardiology : Official Publication of the American Society of Nuclear Cardiology
|June 3, 2008
PubMed

Insights

In patients with idiopathic left-ventricular (LV) dysfunction, stress-induced increases in end-diastolic volume (EDV) and stroke volume indicate preserved pumping reserve. This finding offers powerful long-term death-risk stratification.

Area of Science:

  • Cardiology
  • Exercise Physiology
  • Heart Failure Research

Background:

  • The heart's primary role during exercise is to augment cardiac output to meet tissue metabolic demands.
  • Idiopathic left-ventricular (LV) dysfunction presents a challenge in maintaining adequate cardiac output.
  • Assessing the interplay of systolic and diastolic function is crucial for understanding cardiac output modulation in LV dysfunction.

Purpose of the Study:

  • To determine the relative contributions of systolic versus diastolic dysfunction in modulating cardiac output.
  • To investigate the mechanisms underlying cardiac output changes during exercise in patients with LV dysfunction.
  • To evaluate the prognostic significance of preserved LV functional reserve.

Main Methods:

  • 51 patients with idiopathic LV dysfunction (ejection fraction 36% ± 9%) and 24 controls were studied.
  • Exercise radionuclide angiography was used to assess LV functional reserve.
  • Patients were followed for a median of 129 months for clinical outcomes.

Main Results:

  • In controls, stroke volume increased via decreased end-systolic volume; in patients, it increased via end-diastolic volume (EDV) changes.
  • Patients with preserved stroke volume increase during stress (Group I) showed improved ventricular-arterial coupling and cardiac efficiency.
  • Group I had significantly better event-free survival (88%) compared to Group II (61%) (P = .03).

Conclusions:

  • Preserved LV pumping reserve in idiopathic LV dysfunction can be identified by stress-induced EDV and stroke volume variations.
  • These variations provide a powerful tool for long-term death-risk stratification in patients with LV dysfunction.
  • Understanding these mechanisms aids in managing heart failure and predicting patient outcomes.
Abstract

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