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Cardiac dysfunction in the euglycemic diabetic-prone BB Wor rat.

Tom L Broderick1, Andrea K Hutchison

  • 1Department of Physiology, Midwestern University, Glendale, AZ 85308, USA.

Metabolism: Clinical and Experimental
|November 13, 2004
PubMed
Summary

Diabetic-prone rats show impaired heart contractility and relaxation even before diabetes onset. Their cardiac function declines further with high afterload, especially when palmitate is present, highlighting a prediabetic cardiac abnormality.

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Area of Science:

  • Cardiology
  • Endocrinology
  • Metabolic research

Background:

  • Prediabetes is a growing concern, often preceding type 1 diabetes.
  • Cardiac dysfunction can occur in prediabetic states.
  • The BB Wor rat is a model for studying type 1 diabetes development.

Purpose of the Study:

  • To investigate cardiac function in prediabetic BB Wor rats.
  • To assess cardiac performance under varying physiological conditions.
  • To determine if early cardiac abnormalities exist before overt diabetes.

Main Methods:

  • Isolated heart perfusion technique was used.
  • Cardiac function was measured under increased filling pressures.
  • Hearts were subjected to increased afterload with glucose and palmitate perfusion.

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Main Results:

  • Diabetic-prone rats exhibited reduced contractility and relaxation at high filling pressures.
  • Cardiac output was depressed in diabetic-prone rats under high afterload, specifically with palmitate.
  • Control rats showed no significant cardiac dysfunction.

Conclusions:

  • Hearts from prediabetic BB Wor rats display impaired contractile performance.
  • This model is valuable for studying cardiac function during the prediabetic state.
  • Early cardiac abnormalities may be exacerbated by metabolic factors like palmitate.