Hoover Sign in Pulmonology: Clinical Significance and Management

Definition and Clinical Significance

• The European Respiratory Society suggests that the presence of Hoover sign is associated with body mass index, severity of dyspnea, and frequency of exacerbations in patients with COPD 1, 2, 3

Prognostic Implications

• The European Respiratory Society indicates that the presence of Hoover sign suggests severe diaphragmatic flattening with decreased mobility and efficiency, and is associated with respiratory muscle dysfunction or fatigue during COPD exacerbations 1, 2, 3

Management Considerations

• The European Respiratory Society recommends that when Hoover sign is present during an exacerbation, the severity should be assessed in hospital with objective measurements, including evaluation for tachypnea, tachycardia, accessory muscle use, cyanosis, and uncoordinated ribcage motion 1, 2, 3
• The British Thoracic Society suggests that arterial blood gas measurement is necessary to identify hypoxemia and hypercapnia in patients with Hoover sign 4
• The European Respiratory Society recommends that bronchodilator therapy should be optimized, using short-acting β₂-agonists or anticholinergics initially, with consideration for combination therapy in moderate-to-severe disease 4
• The British Thoracic Society suggests that a corticosteroid trial (30 mg prednisolone daily for two weeks with pre- and post-spirometry) should be considered in moderate-to-severe COPD 4

Clinical Pitfalls

• The European Respiratory Society notes that physical examination sensitivity for detecting COPD is poor, and Hoover sign may be missed on cursory examination, emphasizing the need for objective spirometric confirmation 1, 5
• The European Respiratory Society warns that classic signs of hypercapnia are inconsistent and unreliable; do not rely on physical examination alone to assess gas exchange 1, 2