The ECG file extension is used for ECG Electrocardiography files by some medical devices. ECG stands for Electrocardiography, a transthoracic interpretation of the electrical activity of the heart over time captured and externally recorded by skin electrodes. It is a noninvasive recording produced by an electrocardiographic device. Most manufactures of such devices, also develop a software, which does log or export the recordings to a computer file. One of such format is the ecg file type.
ECG file type is probably old or no longer supported file format. This entry was verified by File-Extensions.org team. In the time of research, there was not any internet source available, to help us find out what kind of file type it is.