7A42.0 Obesity hypoventilation syndrome

International Classification of Diseases for Mortality and Morbidity Statistics, 11th Revision, v2025-01

Obesity hypoventilation syndrome is characterised by obesity (in adults, Body-Mass-Index > 30 kg/m²) and daytime hypercapnia indicated by arterial partial pressure of carbon dioxide (PaCO2) > 45 mm Hg that cannot be fully attributed to an underlying cardiopulmonary or neurologic disease. Hypercapnia worsens during sleep and is often associated with severe arterial oxygen desaturation. Obstructive sleep apnoea is also present in the majority of cases and should be diagnosed in addition to obesity hypoventilation. Note: A definitive diagnosis requires demonstration of daytime hypercapnia and objective evidence based on polysomnography, with carbon dioxide (CO2) monitoring (by arterial, end-tidal or transcutaneous measures).

inclusions

• Pickwickian syndrome

postcoordination

synonyms

• Obesity hypoventilation syndrome
• Pickwickian syndrome
• cardiopulmonary obesity syndrome
• alveolar hypoventilation syndrome
• alveolus hypoventilation syndrome
• OHS - [obesity hypoventilation syndrome]
• Obesity hypoventilation syndrome with BMI 30.00-34.99 kg/m²
• Obesity with alveolar hypoventilation with Body-Mass-Index of 30 kg/m² but less than 35 kg/m²
• Obesity with alveolar hypoventilation with Body-Mass-Index of 30 but less than 35
• Obesity hypoventilation syndrome with BMI 35.00-39.99 kg/m²
• Obesity with alveolar hypoventilation with Body-Mass-Index of 35 but less than 40
• Obesity with alveolar hypoventilation with Body-Mass-Index of 35 kg/m² but less than 40 kg/m²
• Obesity hypoventilation syndrome with BMI greater than or equal to 40.00 kg/m²
• Extreme obesity with alveolar hypoventilation with Body-Mass-Index of 40 and more
• Extreme obesity with alveolar hypoventilation with Body-Mass-Index of 40 kg/m² and more
• Extreme obesity with alveolar hypoventilation with BMI unspecified
• Extreme obesity with alveolar hypoventilation with Body-Mass-Index unspecified

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