Abstract: Portable ECG monitoring apparatus comprises a sensor device 1 detachable from a monitoring device 2. The sensor device includes ECG sensors attached via cabling 5 to a connector 4. The sensor device 1 and monitoring device 2 are connected by attaching the connector 4 to the monitoring device 2, which provides a watertight seal for the apparatus and prevents access to any internal components in the monitoring device 2.

Abstract: ECG recording apparatus 1 includes a port 2 for connection to ECG electrodes and a microphone 3 for detecting vocal signals, Processing electronics store a recording of the vocal signals and the physiological data on the storage medium 4.

Abstract: A method for analyzing a cardiac signal, e.g. an electrocardiogram signal, comprises continuously generating values RR(t) and QT(t), representing the RR and QT intervals respectively as functions of time, and operating on one or both values to compensate for the naturally occurring delay between the change in the RR interval and the resulting change in the QT interval. A delay may be introduced into the RR(t) value by a resistor-capacitor network having two time constants T1 and T2. After compensating for the delay, S(t), the slope of the graph of the QT interval against the RR interval may be found and used to generate Qtc(t), the corrected QT interval at a standard RR interval. Alternatively, an advance may be introduced into the value QT(t). Apparatus for generating Qtc(t) may include a hybrid digital/analog circuit applying an “xth root law.