What type of communication is mainly utilized to communicate changes from management to staff?

Downward communication is the correct choice as it specifically refers to the flow of information from higher levels of management to lower levels, such as staff members. This type of communication is essential in organizational settings, especially when it comes to conveying changes in policies, procedures, or any other significant updates that require staff awareness and responsiveness.

In a healthcare environment, management might need to inform nurses and other staff about changes in protocols, safety measures, or organizational goals. Downward communication ensures that messages are clear, concise, and directed towards staff who need to implement or adhere to these changes.

Other forms of communication, while valuable in their own right, serve different purposes. Upward communication typically involves feedback or information communicated from employees to management, which is important in fostering an open dialogue but does not address the primary goal of disseminating information from the top down. Horizontal communication pertains to interactions between peers at the same level in an organization, while diagonal communication involves interactions across different levels and departments but doesn't focus exclusively on changes being communicated from management to staff.