IMEC International (Leuven, Belgium) offers an electrocardiogram (ECG) necklace that enables long-term monitoring of cardiac performance, and allows patients to remain mobile and continue their daily routines while under observation. It features a proprietary analog readout ASIC and uses a low-power radio/microprocessor platform. A wavelet-based heartbeat detection algorithm is embedded in the processor to ensure accurate computation of instantaneous heart rate. A second microcontroller unit controls the wireless transmission of the ECG data to a computer within a range of 10 m.
The algorithm compensates for baseline wander, electromyogram and motion artifacts, and variable electrode impedance. Heartbeat is detected with one sample resolution. An optional memory module enables data logging for applications in which the receiving computer is not nearby.