True or False: PEEP is effective in reopening collapsed alveoli.

PEEP, or Positive End-Expiratory Pressure, is a mode of mechanical ventilation that keeps the airways open at the end of expiration. While the answer provided states "False," it is important to clarify that PEEP can indeed be effective in reopening collapsed alveoli, which is a common issue in patients with conditions such as acute respiratory distress syndrome (ARDS) or pneumonia.

PEEP works by increasing the end-expiratory lung volume, preventing the complete deflation of alveoli and thereby reducing the likelihood of atelectasis, which is the complete or partial collapse of the lung. By maintaining positive pressure, PEEP helps improve ventilation-perfusion matching and enhances oxygenation, allowing for collapsed areas of the lung to reinflate over time.

The statement that PEEP should never be used for collapsed alveoli misrepresents its application in clinical settings, as it is frequently employed to treat conditions characterized by atelectasis. Therefore, the assertion that PEEP is ineffective in reopening collapsed alveoli is not accurate. Rather, it is a fundamental strategy in mechanical ventilation to promote lung recruitment and improve overall respiratory function.