What can be a consequence of using PEEP in patients with poor cardiac function?

The application of Positive End-Expiratory Pressure (PEEP) in patients with poor cardiac function can lead to decreased cardiac output. PEEP helps maintain alveolar recruitment and improve oxygenation; however, it can also increase intrathoracic pressure. This elevated pressure can impede venous return to the heart, subsequently reducing stroke volume and overall cardiac output.

In patients with compromised cardiac function, the heart may already be struggling to pump effectively. When PEEP is applied, the additional pressure can exacerbate this issue, resulting in diminished filling of the heart and decreased ability to pump blood adequately throughout the body. This relationship between increased intrathoracic pressure from PEEP and decreased venous return is critical to understanding the potential hemodynamic impacts of ventilatory support practices in patients with underlying cardiac issues.