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High Output Cardiac Failure.

Inder S. Anand1, Viorel G. Florea

  • 1Department of Cardiology, Veterans Administration Medical Center, One Veterans Drive 111-C, Minneapolis, MN 55417, USA. anand001@tc.umn.edu

Current Treatment Options in Cardiovascular Medicine
|March 10, 2001
PubMed
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High output heart failure, often misnamed, occurs when the heart functions normally but faces decreased systemic vascular resistance. Understanding its mechanisms and curable causes is key to effective treatment, avoiding therapies that worsen congestion.

Area of Science:

  • Cardiology
  • Internal Medicine

Background:

  • Congestive heart failure (CHF) typically presents with low cardiac output.
  • High output states, characterized by normal or elevated cardiac output, can also precipitate CHF.
  • Conditions like severe anemia, arteriovenous fistulas, and septic shock exemplify high output states.

Purpose of the Study:

  • To review the mechanisms and treatment of high output heart failure (HOFH).
  • To clarify the pathophysiology of HOFH, distinguishing it from traditional CHF.
  • To highlight curable causes and potential therapeutic pitfalls in HOFH management.

Main Methods:

  • Literature review of high output cardiac failure.
  • Emphasis on underlying pathophysiological mechanisms.
  • Analysis of current treatment strategies and their implications.

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Main Results:

  • HOFH is characterized by decreased systemic vascular resistance, not cardiac dysfunction.
  • Neurohormonal activation leads to salt and water retention.
  • Vasodilator therapy may exacerbate congestion in HOFH due to reduced vascular resistance.

Conclusions:

  • High output heart failure is a distinct syndrome requiring specific diagnostic and therapeutic approaches.
  • Identifying and treating the underlying curable cause is paramount.
  • Careful consideration of vasodilator use is necessary to avoid worsening patient condition.