The ZIO®XT Patch is well tolerated for prolonged monitoring and compliance is excellent with studies demonstrating a mean monitoring wear time of 10.8 days (range 4-14 days) and 10.9 days (median 13.0 days). Barrett et al showed that 80% of patients who had worn a Holter monitor for 24 hours, and a ZIO®XT Patch for up to 14 days, preferred the ZIO Patch. Single channel ECG data quality is also excellent with one study showing more than 98% of the total recording time was analysable, and a second study showing a median analysable time of 99% of the total wear time. Compliance with returning the device is also good. In a study of 174 ED with indications for monitoring (syncope, dizziness and palpitations), all patients mailed back their devices.