Methods: 191 IS/TIA patients without AF history. Implantable loop recorders (ILRs) can provide an enhanced possibility to detect atrial fibrillation (AF), but the accuracy, especially the positive predictive value (PPV), is controversial. The King of Hearts monitor is a type of event monitor that is worn for 30 days. implantable loop recorder (ilr) the ilr is a continuous loop recorder that is implanted in the body under the skin. Continuous loop records (aka presymptom memory loop recorders) are also worn on the body and are continuously recording and erasing data every few minutes. External patient and, when performed, auto activated electrocardiographic rhythm derived event recording with symptom-related memory loop with remote download capability up to 30 days, 2 4-hour attended monitoring; includes transmission, review and interpretation by a physician or other qualified health care professional Interpretations of external loop recorder and implantable loop recorder findings. The most common of all event monitors is the loop recorders. Am Heart J. Thirteen patients who underwent AF ablation were enrolled. 2005 Nov. 150(5):1065. . Aim: To compare the diagnostic value of seven-day external loop recording (ELR) and two-day Holter recording for detecting AF after IS/TIA. Gibson TC, Heitzman MR. A loop monitor uses a loop recording methodology where it is constantly capturing data but only permanently stores data when the patient presses the ‘event’ button. Of the 49 patients assigned randomly to an external loop recorder first, 31 (63%) had an arrhythmia identified or excluded, versus 12 (24%) of 51 patients assigned to a Holter monitor initially (P <0.0001). These patients are often referred for 24-hour Holter ECG, although the sensitivity for detecting relevant arrhythmias is comparatively low. Atrial fibrillation (AF) is the most common cardiac cause of ischemic stroke and transient ischemic attack (IS/TIA). There are standard loop recorders, auto detect recorders, wireless event monitors and post event monitors. In 1 trial, the overall probability of obtaining a symptom-rhythm correlation was 56% (44 of 78) for loop recorders worn for 1 month versus 22% (12 of 55) for 48-hour Holter monitors. Endpoint was AF >30s. like a continuous loop recorder applied to the body surface, the ilr is useful for diagnosing infrequent rhythm problems associated with incapacitating symptoms, such as syncope. Intermittent short ECG recording over a longer time period might be a convenient and more sensitive alternative. Many patients report symptoms of palpitations or dizziness/presyncope. External loop recorder. A cardiac event monitor, such as a ZIO patch, can be worn for up to 2 weeks to giving a much more complete picture of one’s heart rhythm than a holter monitor and helps determine if there is something to treat or not and whether symptoms are likely to recur. Arrhythmia was identified as a cause of syncope in 1 patient with a loop recorder, compared with no patients with a Holter monitor (P = 0.31). A cost-effectiveness analysis of a randomized trial of external loop recorders versus Holter monitoring. As for syncope, the gold standard for loop recorder use is the correlation between ECG recordings and symptoms. They are relatively small and worn like a Holter, with sensor pads on the chest. This study aimed to evaluate the accuracy of ILRs for detecting AF through a comparison with Holter. There are a few studies using ELR for patients with unknown syncope. The diagnostic yield of ELR was higher than standard 24h-Holter monitoring , and it was similar to the diagnostic yield of ILR in the same timeframe , , . The specificity of the technique is high when an arrhythmia is documented during symptoms. 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