The value of the Number of Waveform Channels (003A,0005) in each Waveform Sequence Item shall be between 1 and 13, inclusive. The total number of channels encoded across all Items shall not exceed 13.
Note: This specialization provides for up to five Waveform Sequence Items (multiplex groups), with a total of 13 channels. This allows, for instance, encoding of four sets of three simultaneously recorded channels, the sets being acquired sequentially, plus one continuous channel for the duration of the other sets. This can be used to emulate the behavior of classical 12-lead ECG strip chart recorders with 4x3 presentation, plus a continuous lead II recording (see figure).
Multiplex Group 1 - leads I, II, III; time offset 0; duration 2.5 sMultiplex Group 2 - leads aVR, aVL, aVF; time offset 2.5 s; duration 2.5 sMultiplex Group 3 - leads V1, V2, V3; time offset 5.0 s; duration 2.5 sMultiplex Group 4 - leads V4, V5, V6; time offset 7.5 s; duration 2.5 sMultiplex Group 5 - lead II; time offset 0; duration 9.84 s
FIGURE A.34.3-1 12-Lead ECG Example (Informative)