Background and Significance Arrhythmia monitoring in patients undergoing atrial fibrillation ablation is challenging. Trans-telephonic monitors (TTMs) are cumbersome to use and provide limited, temporal assessment. Implantable loop recorders may overcome these limitations. The ABACUS study sought to evaluate the utility of implantable loop recorders (ILRs) versus conventional monitoring (CM) in patients undergoing AF ablation. In AF ablation patients, ILR detected more arrhythmias than CM. However, false detection remained a challenge including the inability to the ILR to detect atrial fibrillation less than 2 minutes in duration. The investigators concluded that with adequate oversight, ILRs may be useful in monitoring these patients after ablation. [13] ILR's have been convenient to patients due to the fact that they do not require electrodes or patches. In addition there is no external monitor that must be accompanied with the electrode adhesive pair.