A new prospective study finds that the use of iRhythm's (San Francisco) ZIO Service significantly increased detection of cardiac arrhythmias, compared to the use of the traditional Holter monitor. The findings, published and made publicly accessible online in the January issue of the American Journal of Medicine, give the company ammunition in its bid to have the ZIO Service, comprised of the ZIO Patch, proprietary algorithms and ZIO Report, become the new standard for ambulatory monitoring of patients with suspected arrhythmia.