Ards

About Ards

Acute Respiratory Distress Syndrome (ARDS) is a severe, life-threatening condition characterized by rapid onset of widespread inflammation in the lungs, leading to fluid accumulation in alveoli and severe impairment of gas exchange. It typically develops within hours to days following a precipitating injury such as sepsis, pneumonia, trauma, or aspiration, and carries a high mortality rate despite advances in supportive care.

Pathophysiology

ARDS results from damage to the alveolar-capillary barrier, causing increased permeability and allowing protein-rich fluid to leak into the alveolar spaces. This inflammatory cascade involves neutrophil activation, cytokine release, and surfactant dysfunction, leading to ventilation-perfusion mismatch, decreased lung compliance, and refractory hypoxemia that doesn't respond adequately to supplemental oxygen.

Clinical Reasoning

Diagnosis is based on the Berlin Definition criteria including acute onset within one week of known risk factor, bilateral opacities on chest imaging, respiratory failure not fully explained by heart failure, and specific PaO2/FiO2 ratios that classify severity as mild, moderate, or severe. Management focuses on lung-protective ventilation strategies with low tidal volumes, appropriate PEEP levels, and addressing the underlying cause while providing supportive care to prevent complications.