What are the optional Strategies for Successful Extubation in Morbidly Obese, Congestive Heart Failure and Pneumonia ICU Patient?

Abstract

ABSTRACT

Background : Successful extubation strategies from mechanical ventilation in morbidly obese patients is challenging. Reduced functional residual capacity, decreased thoracic compliance, and increased intra-abdominal pressure predispose to atelectasis and impaired gas exchange. Elevated airway resistance raises work of breathing, while blunted ventilatory responses to hypercapnia and hypoxia worsen ventilatory load. Higher oxygen consumption and carbon dioxide production further increase demands. Comorbidities such as congestive heart failure (CHF) and pneumonia aggravate this condition by worsening pulmonary congestion, limiting cardiac reserve, and increasing ventilation-perfusion mismatch, thus heightening the risk of extubation failure in ICU patients.

Case Illustration : A 29-year-old female (BMI 57.7 kg/m²) with severe TR/MR-related CHF, AKI, hyperkalemia, and pneumonia underwent prolonged ventilation with gradual weaning. Echocardiography revealed RA/RV dilatation, severe TR, RV dysfunction (TAPSE 13 mm), pulmonary hypertension probability, and preserved LV function. A follow-up confirmed grade I diastolic dysfunction and mild pericardial effusion. This patient had persistent hypercapnia (pCO₂ 65–80 mmHg) from admission. During mechanical ventilation (Days 1–7), oxygenation (pO₂) was maintained with high FiO₂. Prior to weaning (Days 10–13), pCO₂ rose above 100 mmHg, indicating increased respiratory load. Serial chest X-rays showed gradual improvement of pulmonary infiltrates throughout ICU care. The serial pH also remains stable. After extubation with HFNC on Day 14, pCO₂ gradually decreased to 65–70 mmHg while pO₂ stabilized within 90–100 mmHg. Even after transition to NRM (Days 17–20), oxygenation remained adequate without reintubation.

Conclusion : Although NIV is effective in reducing reintubation, HFNC was successfully used in this morbidly obese patient with CHF and pneumonia, maintaining stable oxygenation and controlled hypercapnia throughout the ICU stay. The therapy provided adequate gas exchange, improved comfort, and reduced the work of breathing, all of which supported gradual recovery without respiratory distress. The patient was later transitioned to a non-rebreather mask and continued to improve without the need for reintubation.