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Relative bradycardia in infectious diseases

L Ostergaard1, B Huniche, P L Andersen

  • 1Department of Infectious Diseases, Marselisborg Hospital, Aarhus, Denmark.

The Journal of Infection
|November 1, 1996
PubMed
Summary

Relative bradycardia in infectious diseases lacks a clear definition and predictive value for individual patients. However, it is a characteristic feature of specific diseases like typhoid fever and Legionnaire's disease.

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Area of Science:

  • Infectious Diseases
  • Clinical Medicine
  • Internal Medicine

Background:

  • Relative bradycardia is an inconsistently defined clinical sign in infectious diseases.
  • Its underlying mechanisms and diagnostic utility remain unclear.
  • The term is frequently used in literature and clinical practice.

Purpose of the Study:

  • To establish definitions for relative bradycardia as both a clinical sign and a disease characteristic.
  • To evaluate the diagnostic predictive value of relative bradycardia in infectious diseases.

Main Methods:

  • A reference population of 673 patients with diverse infectious diseases was analyzed.
  • Relative bradycardia was assessed as a clinical sign in individual patients.
  • Relative bradycardia was evaluated as a characteristic feature of specific infectious diseases.

Main Results:

  • Relative bradycardia as a clinical sign showed no predictive value for infection type.
  • Relative bradycardia was a significant feature of typhoid fever, Legionnaire's disease, and Chlamydia sp. pneumonia.
  • It was not associated with Mycoplasma pneumoniae, other Salmonella infections, or viral infections.

Conclusions:

  • Relative bradycardia as a clinical sign has limited diagnostic utility.
  • Relative bradycardia as a disease feature is specific to certain infections, notably typhoid fever, Legionnaire's disease, and Chlamydia sp. pneumonia.
  • This feature appears linked to infections caused by Gram-negative, intracellular organisms.

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