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. 2019 Apr 17;6(2):48–52. doi: 10.1049/htl.2018.5043

Table 1.

Abnormal criteria of the ECG wave pattern

Waveform segment Very high High Low Very low Normal
PR, ms >250 >200 <120 <60 200–60
QRS, ms >350 >300 <200 <120 350–120
QT, ms >450 >310 <250 <100 310–60
ST, s >1.2 >1 <0.4 <0.2 l.2–0.6
RR, ms >550 >200 <120 <60 200–60