- Ideal Body Weight (IBW) Basis: Tidal volumes should be calculated based on the patient's IBW rather than actual body weight, as this more accurately reflects the lung size and capacity. Using actual body weight could result in overdistension of the lungs and barotrauma.
- Tidal Volume: Aim for a low tidal volume of 6-8 mL/kg IBW. This range is designed to reduce the risk of ventilator-induced lung injury while ensuring adequate ventilation.
- Positive End-Expiratory Pressure (PEEP): Applying a moderate PEEP of around 10 cm H2O can help keep alveoli open at the end of expiration, preventing alveolar collapse (atelectasis) and improving oxygenation.
- Recruitment Maneuvers: Periodic recruitment maneuvers every 30 minutes can enhance lung aeration by temporarily increasing transpulmonary pressure, which helps in redistributing lung fluids and opening collapsed alveoli. This practice can improve ventilation-perfusion matching and reduce atelectasis.
- Increased Airway Pressures: Obese patients may exhibit decreased chest wall compliance, especially in positions like supine or Trendelenburg. This characteristic necessitates higher than normal airway pressures to achieve adequate ventilation. However, it's essential to closely monitor these pressures to avoid causing lung injury.
