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In an in home usage outpatient setting, patient compliance is a key factor in determining the adoption and efficacy of treatment for any illness and is paramount for patient dependent medical technologies such as mobile patient monitoring systems. As a leader in the development of these technologies, Corventis has deployed its NUVANT™ Mobile Cardiac Telemetry System to thousands of patients around the world. The NUVANT system includes an externally worn adherent sensing device, the PiiX, whose proper application is critical to the on-patient longevity and thus performance of the NUVANT system. Patient compliance in this context is a universal challenge for such patient-applied adherent devices. Understanding and tracking a problem is key to solving it and the integrated suite of vital sign sensors in the Corventis PiiX offers a unique opportunity for extracting patient application compliance information from the incoming health data. Analysis of data from 5000 randomly selected patients has shown that improper application of the PiiX is a factor in 2.3% of patients. However, no reduction in adherent device longevity or performance was observed. Such information is a valuable feedback metric for product design, instructions for use, packaging of medical technologies, level of customer support and replacement costs.