Sample size
death, thirty-four, syncope
RECURRENCE
Two thousand two hundred and thirty-four participants (1117 standard and 1117 intervention) presenting acutely with syncope whose syncope remains unexplained after initial ED/AMU assessment will be recruited. Using an estimated mean 1-year recurrence rate in untreated patients of 42.5%The study will recruit an extra 5% in each arm (ie, 1117 participants per arm; 2234 in total) to allow for drop-out/loss to follow-up although we expect this to be low (<1% in pilot) and drop out due to death (<1% in pilot). It is expected that most people will respond to some text/email follow-ups, but few will respond to all. We will therefore call any participant who has not responded for 3 consecutive months to ensure no syncope episodes have occurred and to encourage continued future engagement. Participants will be defined as lost to follow-up only if both 1-year electronic patient health record data and 1-year self-reported data are unavailable.