Event recording devices can be divided into loop and post-event recorders. The second type of ECG monitoring applications is the event monitoring. In these cases, event monitor could be used. Additionally, there is no real-time analysis of the recoded signals. The main limitation of Holter monitoring is the detection of intermittent arrhythmias, because symptoms happen infrequently. Patients keep a diary of their symptoms and function normally with their daily activities, with the exceptions of activities such as taking a shower, swimming, or any activity causing an excessive amount of sweating, that cause the electrodes to become loose or detached during recording. Holter signal is an ECG recording done over a period of 1–7 days, wherein three electrodes, at least, are attached to the patient’s chest and connected to a small portable ECG recorder, generally by lead wires. Generally, personal ECG devices could be divided into holter devices, and event recorders. Different designs of ECG devices were proposed to operate in telemedicine system in order to make the procedure of signal recording easy and smooth for users. Patients with cardiac issues, as well as healthy people, can now record ECG signals and send them to physicians or health centers using developing communication technology, which helps to enable ECG recording regardless of place and time. Over the last few years, many ECG measuring applications emerged taking advantage of the widespread use of smart phones. Post-event short-term ECG recording using the proposed design provide physicians reliable three ECG leads with direct symptom-rhythm correlation. The proposed device was designed to allow patients to manage the technical requirements of both working modes. The proposed multi-purpose ECG device allows physicians to choose the working mode of the same device according to the patient status. Additionally, we compared and presented the correlation coefficient and the automatic QRS delineation results of both short-term post-event recorder and 12-leads golden standard ECG recorder. In the validation phase, a sample of validation signals followed peer review process wherein two experts annotated the signals in terms of signal acceptability for diagnosis.We found that 96% of signals allow detecting arrhythmia and other signal’s abnormal changes. Recording of an ECG signal was performed for 391 patients using a standard 12-leads golden standard ECG and the proposed patient-activated short-term post-event recorder. We present the evaluation of the novel short-term recorder design. In order to overcome the problem of signal quality fluctuation due to using different electrodes types and different placements on subject’s chest, customized ECG signal processing and interpretation pipeline is presented for each working mode. Moreover, patients can use the device to record long-term signals in loop and holter modes, using wet electrodes. The proposed ECG device’s mechanical design allows laypersons to easily record post-event short-term ECG signals, using dry electrodes without any preparation. The system consists of an ECG device, a cloud-based analysis pipeline, and accompanied mobile applications for physicians and patients. In this paper, we introduce design, implementation, and validation of a multi-purpose telemetry system for recording, transmission, and interpretation of ECG signals in different recording modes. Choosing the right device with the desired working mode, signal quality, and the device cost are still the main obstacles to massive usage of these devices. Telemetry ECG devices allow easy and fast ECG monitoring of patients with suspected cardiac issues. Taking advantage of the developed telecommunication infrastructure, several approaches that address the development of telemetry cardiac devices were introduced recently. The Electrocardiogram ECG is one of the most important non-invasive tools for cardiac diseases diagnosis.
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