Figure 3
Excerpt of a record s20274 from the LTST DB. Time trends of the second lead of the 2-lead record s20274 from the LTST DB (6 hour excerpt from 24 hour record is shown, starting at 6 hours after the start of the recording), where deflection of lead was determined as negative instead of mixed or no episodes. Legend: (a) heart rate ([bpm]); (b) ST segment level function, s A(1, j), as derived by the human expert annotators of the LTST DB ([μ V]); (c) ST segment deviation function, d A(1, j), as derived by the human expert annotators ([μ V]); (d) ST segment level function, s(1, k), as derived by the algorithm ([μ V]); (e) ST segment reference function, r 2(1, k), as derived by the algorithm ([μ V]); (f) ST segment deviation function, d(1, k), as derived by the algorithm ([μ V]); (g) Above the line: one axis shift (vertical tic, time 10 h 8 min) as detected by the algorithm and only one elevated transient ischemic ST segment episode (thin rectangle) as annotated by the human expert annotators (see the arrow). Below the line: one axis shift (vertical tic, time 10 h 8 min) and 15 depressed ischemic episodes (thin rectangles) as annotated by the human expert annotators according to the protocol B of the database.