What should be the overall characteristic of the device after passing the seal test?

The overall characteristic of the device after passing the seal test being that it should cover all lobes of the left atrial appendage (LAA) without any gaps is crucial for ensuring its effectiveness in preventing thrombus formation. The primary purpose of a left atrial appendage occlusion device is to create a complete seal that prevents blood from flowing into the appendage where clots can form. If there are any gaps or areas not adequately covered, these could serve as potential sites for thrombus development, thereby undermining the purpose of the procedure. A complete seal is essential not only for the immediate effectiveness of the device but also for minimizing the risk of long-term complications, including stroke. Therefore, ensuring the device can adequately cover all lobes of the LAA is paramount for the successful implementation of LAAO interventions.