A massive IT outage is affecting hospitals across the Waikato region.Health NZ spokesperson Stephanie Doe said a "network connectivity issue" had cut access to a number of applications used in Waikato hospitals.This included Waikato, Thames, Te Kūiti, Tokoroa and Taumaranui."Where clinical systems are impacted, hospitals are reverting to manual processes to support continuity of care."She said hospitals were prioritising urgent care and impacted patients would be contacted directly. Patients who have not been contacted should attend their appointments as normal.She said the health agency was working to resolve the issue as quickly as possible.But an email to staff said a timeline to resolve the issue was unknown.It said theatres would continue for urgent and prioritised care.Outpatient clinics have been postponed and the laboratory would be prioritising critical tests.Radiology was to use a paper-based request system and could review images, but not send results.The email said impacts were varied across services "depending on whether applications are hosted on local servers or not".