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![QRS transitional zone in chest leads](http://d3e1m60ptf1oym.cloudfront.net/daa5cde3-aa40-4854-824e-0f8e348e5a7e/ecg_transitional_zone_large.jpg)
![Wandering atrial pacemaker (WAP)](http://d3e1m60ptf1oym.cloudfront.net/1e661832-05da-42a6-acac-58323d1631e6/ecg_WAP_large.jpg)
Wandering atrial pacemaker (WAP)
Wandering atrial pacemaker
© Alila Medical Media
Image size: 39.1 Mpixels (112 MB uncompressed) - 6251x6251 pixels (20.8x20.8 in / 52.9x52.9 cm at 300 ppi)
![ECG cycle explained.](http://d3e1m60ptf1oym.cloudfront.net/c1bcab84-0855-11e3-873a-31350ca1fda3/ecg_large.jpg)
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