Upper Lobe Koch's Infection: Symptoms, Causes & Treatment

Upper lobe Koch's infection refers to reactivation pulmonary tuberculosis (TB) with characteristic apical/posterior upper lobe predominance. "Koch's" honors Robert Koch (discovered M. tuberculosis 1882).

Pathogenesis

Primary infection (often childhood) → hematogenous seeding to apices (high O₂) → latent containment (Ghon complex). Reactivation (immune waning, HIV, TNF-α inhibitors, diabetes, aging) → caseating granulomas, cavitation in upper lobes.

Symptoms

• Cough >2 weeks (productive, may be blood-tinged).
• Fever (low-grade, evening), night sweats.
• Weight loss, anorexia, fatigue.
• Chest pain (pleuritic if pleural involvement).
• Dyspnea (advanced).

Diagnosis

• CXR: Upper lobe infiltrates, cavities, volume loss.
• Sputum: AFB smear ×3 (early AM), GeneXpert MTB/RIF Ultra (rapid, detects rifampin resistance), culture + DST (gold standard).
• IGRA/TST: Supportive, not diagnostic of active disease.
• Bronchoscopy: If sputum scarce/negative.

Treatment (Standard 6-Month Regimen)

• Intensive phase (2 mo): INH + RIF + PZA + EMB daily.
• Continuation phase (4 mo): INH + RIF daily.
• Directly Observed Therapy (DOT) standard.
• Pyridoxine 25–50 mg/day with INH (prevent neuropathy).
• Monitoring: LFTs monthly, sputum conversion at 2 mo, visual acuity if EMB.

Drug Resistance

• MDR-TB: Resistant to INH + RIF → longer, injectable-containing regimens.
• XDR-TB: MDR + resistant to fluoroquinolone + bedaquiline/linezolid.

Public health reporting mandatory. Contact investigation essential.