A randomized study of an insertable cardiac monitor versus conventional follow- up in patients with cryptogenic stroke found that by 6 months AF had been detected in 8.9% of patients in the insertable cardiac monitor group versus 1.4% of patients in the control group (95% CI, 1.9 21.7; A randomized study of patients 55 years of age who had had a cryptogenic ischemic stroke or TIA within the previous 6 months found AF lasting 30 seconds in 16.1% in the interven- tion group monitored with a 30-day event triggered recorder compared with 3.2% in the control group who had standard monitoring, including 24-hour Repeated Holter electrocardiographic monitoring in patients 60 years of age with recent stroke signifi- cantly increases the likelihood of AF detection over Improvement in patient outcomes with long-term rhythm monitoring has not been established. 8. A systematic review in 2012 found no evidence that multimodal MRI when used purely for diagnostic purposes improves outcomes, although there was limited evidence that it can change management.61 The use of MRI for in-hospital stroke evaluation grew dramatically from 1999 to 2008, varying widely The growth was likely related to wide- spread appreciation of the diagnostic yield of follow- up brain imaging with MRI within 1 to 2 days. 