What characterizes a single transseptal puncture (TSP)?

A single transseptal puncture (TSP) is a procedure that allows access to the left atrium through the interatrial septum. The characteristic that defines this type of approach is that it creates a larger atrial septal defect, which facilitates the delivery of devices or tools needed for interventions such as left atrial appendage occlusion.

In the context of LAAO, a larger atrial septal defect can enhance the maneuverability of the devices being employed, allowing for better navigation within the left atrium to accurately place occlusion devices. This is particularly important because effective LAAO requires precise positioning to ensure the appendage is adequately occluded. Creating a larger defect through a single TSP can simplify the process of achieving optimal access and deployment.

The other aspects mentioned, like a more stable delivery system, better visual acuity of the left atrium, and less risk of complications, may not inherently relate to the characteristic of a single TSP. Stability and visual acuity often depend on other variables including the specific devices used and the operator's skill, while the risk of complications is influenced by multiple factors during the entire procedure, rather than the technique of puncturing the septum alone.