Home telemonitoring is of great interest in respiratory medicine where a large number of people have long term conditions. We developed a telemedicine instrument for home monitoring of subjects with chronic respiratory diseases. The instrument measures respiratory impedance and connects to the Internet through a notebook. The development of the hardware and software used in the instrument is described, as well as initial in vivo results obtained in a normal and an asthmatic subject. These

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... s were in close agreement with the physiology, confirming the high scientific and clinical potential of this system. Internet transmission tests showed adequate results. We concluded that the developed system could be a useful tool for the implementation of telemedicine services, contributing to reduce the costs of the assistance offered to patients with chronic respiratory diseases.