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The clinical course of idiopathic dilated cardiomyopathy. A population-based study

D D Sugrue1, R J Rodeheffer, M B Codd

  • 1Mayo Clinic, Rochester, Minnesota.

Annals of Internal Medicine
|July 15, 1992
PubMed

Insights

Idiopathic dilated cardiomyopathy has a more favorable prognosis in the general population than previously thought, based on referral center studies. This population-based study shows improved survival rates for this heart condition.

Area of Science:

  • Cardiology
  • Epidemiology
  • Public Health

Background:

  • Idiopathic dilated cardiomyopathy (IDCM) is a significant cause of heart failure.
  • Previous prognostic data for IDCM primarily derived from referral center case series, potentially overestimating disease severity.
  • Population-based studies are crucial for understanding the true clinical course of chronic diseases.

Purpose of the Study:

  • To determine the prognosis of individuals diagnosed with IDCM within a defined population.
  • To compare the survival outcomes of this population-based cohort with a historical referral center case series of IDCM.

Main Methods:

  • A cohort study design was employed.
  • Utilized a population-based sample from Olmsted County, Minnesota, identifying 40 residents diagnosed with IDCM between 1975 and 1984.
  • Follow-up extended through July 1, 1989, with survival data compared to 104 patients from a 1960-1973 Mayo Clinic referral series.

Main Results:

  • One-year survival was significantly higher in the population-based cohort (95%) compared to the referral series (69%).
  • Five-year survival also showed a marked difference: 80% for the population cohort versus 36% for the referral series (P < 0.001).
  • Despite better outcomes than referral cases, the population cohort had impaired long-term survival compared to age- and sex-matched controls, with older age and lower ejection fraction predicting poorer outcomes.

Conclusions:

  • Population-based data suggest that the clinical course of IDCM may be more favorable than commonly perceived from referral center studies.
  • These findings challenge existing clinical perceptions of IDCM prognosis.
  • Further research into community-based IDCM management and outcomes is warranted.
Abstract

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