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[Idiopathic inflammatory myopathies complicated with pneumonias: clinical characteristics and pathogen analysis]

Yan Liang1, Rong Deng, Xin Guo

  • 1Department of Rheumatology and Immunology, West China Hospital, Sichuan University, Chengdu 610041, China.

Sichuan Da Xue Xue Bao. Yi Xue Ban = Journal of Sichuan University. Medical Science Edition
|December 12, 2013
PubMed
Abstract

Insights

Older idiopathic inflammatory myopathies (IIM) patients with interstitial lung disease are at higher risk for pneumonia, often caused by gram-negative bacteria. Prompt antibiotic treatment is crucial for managing these infections.

Area of Science:

  • Rheumatology
  • Infectious Diseases
  • Pulmonology

Background:

  • Idiopathic inflammatory myopathies (IIM) are a group of rare autoimmune diseases affecting muscles.
  • Pneumonia is a serious complication in IIM patients, potentially increasing morbidity and mortality.
  • Understanding risk factors and causative pathogens is vital for effective management.

Purpose of the Study:

  • To identify clinical characteristics and risk factors for pneumonia in IIM patients.
  • To analyze the types of pathogens causing pneumonia in IIM patients.
  • To assess the antibiotic susceptibility of these pathogens.

Main Methods:

  • Retrospective analysis of clinical data from 93 IIM patients with pneumonia.
  • Comparison with 52 IIM patients without pneumonia (control group).
  • Review of pathogen test results and antibiotic sensitivity data.

Main Results:

  • Advanced age at onset and interstitial lung disease were significant risk factors for pneumonia in IIM.
  • Gram-negative bacteria, particularly Klebsiella pneumoniae, were the most frequent bacterial pathogens.
  • Candida albicans was the most common fungal pathogen; infections showed sensitivity to third- and fourth-generation antibiotics.

Conclusions:

  • Older IIM patients, especially those with interstitial lung disease, face an elevated risk of pneumonia.
  • Gram-negative bacteria and atypical pathogens are common causes of pneumonia in this population.
  • Appropriate and timely anti-infective therapy is critical for improving outcomes in IIM patients with pneumonia.

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