Abstract: A system for monitoring a cardiac health of a subject by measuring an indicator of the cardiac health of a subject is disclosed. In some embodiments, the system comprises a wearable device configured for being detachably attached to a thoracic region of the subject, the subject being ambulatory or at rest, a communication device and a network server. In one embodiment, the wearable device is configured for sensing and communicating at least one of the electrocardiogram signals and sensor data representing the one or more clinically relevant health parameters of the subject to the communication device. Further, the communication device is configured for communicating at least the electrocardiogram signal and the sensor data representing the one or more clinically relevant health parameters of the subject to the network server using a first communication channel and a second communication channel.