Syncope Trial to Understand Tilt Testing Early or Recorders Study

"Participant randomized to open-label diagnostic strategy. Results and all follow-up care to be in the hands of treating cardiologist as this is a pragmatic study.~the early HUT \[protocol: supine pre-tilt phase 5 min, un-medicated HUT to 70 degrees for 20 minutes; if response negative then 400 μg of sublingual nitroglycerin and continued 70 degree tilt for 20 minutes\]"

ILR is a small subcutaneously implanted device, lasting up to 3 years, that records heart rhythms, and which may be either auto-triggered or patientactivated.