1st Degree
PQ interval bigger than 5 little boxes = .1 s. One little box = 0.02 s
2nd Degree
Type 1 = Winkebach: PR interval gets longer and longer until a QRS drops, then restarts the cycle.
Type 2: QRS randomly drops, otherwie constant PR intervals.
3rd Degree
Totally dissociated Ps and QRSs
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