Dyspnea Assistant

Cardiac vs pulmonary vs metabolic

Red flags
  • SpO₂ <90% on room air
  • RR >30 or silent chest
  • Altered sensation, cyanosis, accessory muscle use

First steps

  • Sit upright, high-flow O₂ to SpO₂ ≥94%
  • IV access, monitor, ABG

Key investigations

  • ABG, CBC, BNP, troponin
  • CXR, ECG
  • POCUS lung + cardiac

Differentials

  • Acute pulmonary oedema
  • COPD/asthma exacerbation
  • Pneumonia
  • PE
  • Pneumothorax
  • Metabolic acidosis

Initial management

  • Bronchodilator nebs if wheeze (salbutamol 2.5–5 mg + ipratropium)
  • Furosemide 40–80 mg IV + GTN if APO
  • Empirical antibiotics if pneumonia suspected
  • NIV (BiPAP) for COPD/APO if no contraindication

Referral

  • ICU if hypercapnia/refractory hypoxia
  • Pulmonology / Cardiology

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