Obesity Hypoventilation Syndrome
ICD-10 E66.2 · ICD-11 7A42.0

Treatment of Obesity Hypoventilation Syndrome with Acute-on-Chronic Hypercapnic Respiratory Failure When Noninvasive Ventilation Fails

This protocol addresses the clinical situation in which a patient with obesity (BMI ≥30 kg/m²) and acute-on-chronic hypercapnic respiratory failure has not met the required response targets during the initial noninvasive ventilation (NIV) strategy.

Clinical Scenario
Acute decompensated obesity-related respiratory failure in a patient with obesity (BMI ≥30 kg/m²). Noninvasive ventilation is the established first response for this presentation, and acute-on-chronic hypercapnic respiratory failure is habitually treated with NIV.
When the Previous Step Did Not Work
This protocol is entered when the preceding line — noninvasive ventilation with progressive pressure titration, supplemental oxygen, and concurrent management of the precipitating cause — failed within the first 24 hours to achieve its targets: resolution of respiratory acidosis (arterial pH >7.3), arterial oxygen saturation >88% (arterial oxygen tension >8 kPa), and correction of hypercapnia.
Next-Step Approach
When NIV proves insufficient, the protocol specifies a form of invasive ventilatory support in an appropriate care environment — full patient-selection criteria, setting requirements, and the complete guidance are available in the structured protocol.
Instant Access to Structured Evidence-Based Regimens

References

DOI: 10.1183/16000617.0097-2018

Acute-on-chronic hypercapnic respiratory failure is habitually treated with NIV.

Access to NIV should be available within 1 h of presentation to the emergency department for patients with acutely decompensated obesity-related hypercapnic respiratory failure with NIV delivered by specifically trained operators skilled in its application, including interface selection and fitting, along with a strategy to titrate ventilator settings in order to achieve adequate tidal volumes using supplementary oxygen as required.

Patients with poor domiciliary PAP compliance, super obesity (BMI >50 kg·m−²) or multi-organ failure should be trialled on NIV in an environment with rapid access to endotracheal intubation due to higher rates of NIV failure, unless NIV is being utilised as the ceiling of care.

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