Please click here to obtain permission to reproduce this image.
Click on image to view larger version.
Figure 4 Continued (B) Positive TWA (from commercial system) shows (i) Valt  1.9 µV in two precordial or one vector lead (here Valt 4 to 6 µV in V3 to V6) with (ii) k-score 3 (gray shading) for >1 min (here 5 min), at (iii) onset rate <110 beats/min (here 100 beats/min), with (iv) <10% bad beats and <2 µV noise, without (v)artifactual alternans (see text). Black horizontal bars indicate periods when conditions for positive TWA are met.
|
