Which of the following would be considered a niche application in healthcare IT?

A surgical information system (SIS) qualifies as a niche application in healthcare IT because it is specifically designed to support surgical departments and enhance the efficiency and effectiveness of surgical workflows. These systems focus on aspects unique to the surgical process, such as scheduling surgeries, tracking surgical instruments, and managing surgical protocols, which differentiates them from broader healthcare IT applications.

In contrast, the other options tend to have wider applications across various departments in healthcare settings. A patient management system is used across different areas to manage patient interactions and data. Health information exchange facilitates the sharing of health information across different healthcare organizations, making it a more generalized application in healthcare IT. Revenue cycle management software is crucial for the financial operations of healthcare organizations but addresses broader financial management rather than a specific clinical workflow. Thus, the specialized nature of a surgical information system makes it a niche application within the realm of healthcare IT.