Sunday 16 September 2012

Tuberculosis

Tuberculosis

  • Caseating granulomatous infection due to mycobacterium tuberculosis in the lung
  • TB is a notifiable disease and contact tracing is important

Patients at risk
  • Those from developing countries (including contacts)
  • Immunosuppressed patients
  • HIV, steroids, malignancy
  • Alcoholics/homeless people/people living in overcrowded conditions

Clinical features
  • May be none
  • Malaise and lethargy
  • Anorexia/weight loss
  • Fever
  • Cough
  • Haemoptysis

Signs of
  • Pleural effusion
  • Pneumonia
  • Fibrosis

Investigations
  • Chest X-ray
  • Affects upper zones particularly
  • +/- calcification
  • +/- cavitation
  • Sputum microscopy (Ziehl-Nielsen stain) and culture
  • Lung tissue microscopy and culture: bronchoscopy and washings for lung/pleural biopsies

Management
  • 6 months of combination of antibiotics, usually
  • - Rifampicin and isoniazid
  • - + Pyrazinamide for first 2 months +
  • Add ethambutol if risk of drug resistance is increased
  • Compliance is vital
  • Multi-resistant TB does occur, particularly in HIV, and may require more antibiotics (according to sensitivities) over a longer period

Side-effects of anti-TB drugs
  • Rifampicin
    • Liver dysfunction
    • Discolouration of body fluids
    • Reduced effectiveness of oral contraceptives and other drugs
  • Isoniazid
    • High doses cause polyneuropathy
    • Pyridoxine is added to prevent this
  • Pyrazinamide
    • Liver dysfunction
  • Ethambutol
    • Retrobulbar neuritis (patients need ophthalmology monitoring)
  • Streptomycin
    • Vestibular nerve damage

Other mycobacteria
  • Mycobacterium kansasii
    • Less severe than Mycobacterium tuberculosis (normally)
    • Particularly middle-aged men
    • COPD and working in dusty conditions (e.g. miners)
  • Mycobacterium avium intracellulare (MAI)
    • Immunosuppressed patients (e.g. HIV)

1 comment:

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