**Evaluation of the Diaphragm Performance During Weaning From Mechanical Ventilation** This study focuses on patients in the ICU who have been on a machine helping them breathe, called **mechanical ventilation**, for at least 48 hours. The study observes how well patients' **diaphragms** (a muscle that helps with breathing) perform when they are being taken off this machine. During this time, a **diaphragm ultrasound** is used to take pictures of the diaphragm to assess its movement and strength. Patients will be divided into two groups based on how they do without the machine's help. The study hopes to better understand if certain patterns in the diaphragm's performance can predict if a patient will successfully breathe on their own. **Key Points:** - **Participation involves**: An ultrasound of the diaphragm during the weaning process. - **Eligibility**: Must be on mechanical ventilation for at least 48 hours and not have chronic respiratory failure. - **No extra procedures**: It's purely observational during routine care. **Note**: This study does not involve any new treatment, and there are no direct risks as it uses standard monitoring procedures.