In this release, `CardiacSeries`, the main neurodata-type in this extension, in fact extends the base type of NWB TimeSeries and can be stored into three specific data interfaces of `ECG`, `HeartRate` and `AuxiliaryAnalysis`. Also, the `ECGRecordingGroup` is another neurodata-type in this module which extends `LabMetaData` which itself extends the NWBContainer and stores descriptive meta-data recording channels information along with the electrodes implementation (`ECGChannels` and `ECGElectrodes` respectively as extensions of DynamicTable) and a link to another extended neurodata-type -`ECGRecDevice`- which extends the type Device.