According to commentary, some key issues holding back deployment of home telemonitoring are the failure to develop sustainable business models, poor integration into existing health services, scepticism of health-care professionals who have no experience of home telemonitoring, the failure of guidelines to consider the totality of evidence, and the absence of a large, robust trial with a control group that truly reflects usual clinical care. It notes that such systems will continue to evolve, in terms of sensors, access, computing power, artificial intelligence, and new therapies, so further trials are required.