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Relation of lower hematocrit to progression from asymptomatic left ventricular dysfunction to symptomatic heart

Sandeep R Das1, Daniel L Dries, Mark H Drazner

  • 1Donald W. Reynolds Cardiovascular Clinical Research Center, Dallas, Texas, USA. sandeep.das@utsouthwestern.edu

The American Journal of Cardiology
|September 20, 2005
PubMed

Insights

Low hematocrit levels (< or = 40%) are linked to a higher risk of developing heart failure (HF) symptoms and hospitalization. This finding highlights hematocrit as a potential indicator for HF progression in patients with left ventricular systolic dysfunction.

Area of Science:

  • Cardiology
  • Hematology

Background:

  • Left ventricular (LV) systolic dysfunction is a precursor to symptomatic heart failure (HF).
  • The role of hematocrit in the progression of asymptomatic LV dysfunction to symptomatic HF requires further elucidation.

Purpose of the Study:

  • To investigate the association between hematocrit levels and the risk of developing symptomatic heart failure (HF).
  • To examine the relationship between hematocrit and adverse cardiovascular outcomes in patients with LV systolic dysfunction.

Main Methods:

  • Analysis of data from 2,821 patients enrolled in the Studies of Left Ventricular Dysfunction Prevention trial.
  • Stratification of patients into quartiles based on hematocrit levels.
  • Utilizing survival analysis to determine hazard ratios (HR) and 95% confidence intervals (CI) for HF development and related events.

Main Results:

  • Patients in the lowest hematocrit quartile (hematocrit <= 40%) demonstrated a significantly increased risk of developing HF symptoms (HR 1.79, 95% CI 1.37 to 2.34).
  • Lower hematocrit was also associated with a higher risk of first HF hospitalization (HR 2.35, 95% CI 1.52 to 3.62).
  • The risk of death or HF symptom development was elevated in the lowest hematocrit quartile (HR 1.60, 95% CI 1.28 to 1.99) compared to the highest quartile (hematocrit > 46%).

Conclusions:

  • Hematocrit levels may serve as a prognostic marker for HF progression in patients with asymptomatic LV systolic dysfunction.
  • Lower hematocrit is associated with an increased risk of adverse outcomes, including symptomatic HF and hospitalization.
  • Further research is warranted to explore the underlying mechanisms and clinical implications of this association.

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