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  Calibration ã 25mm/s ã 10mm/mV  PR Interval: From the start of the P wave to the start of the QRS complexPR Segment: From the end of the P wave to the start of the QRS complexJ Point: The junction between the QRS complex and the ST segmentQT Interval: From the start of the QRS complex to the end of the T waveQRS Interval: From the start to the end of the QRS complexST Segment: From the end of the QRS complex (J point) to the start of the T wave  Normal Value ã Heart rate60 -100 bpm ã PR interval0.12 -0.20 s ã QRS interval ≤ 0.12 s ã QT interval< half RR interval (males < 0.40 s; females < 0.44 s) ã P wave amplitude (in lead II) ≤ 3 mV (mm) ã P wave terminal negative deflection (in lead V1) ≤ 1 mV (mm) ã Q wave< 0.04 s (1 mm) and < 1/3 of R wave amplitude in the same lead
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