TitleWith regard to the ECG: a. 1 large square = 0.5 s b. the normal PR interval is 0.12 to 0.20 s c. theDescription

With regard to the ECG:

a. 1 large square = 0.5 s

b. the normal PR interval is 0.12 to 0.20 s

c. the normal QRS duration is

d. the normal QT interval (corrected for heart rate;QTc) is QT/v

RR (where RR is the interval fromthe onset of one QRS complex to the onset of thenext, measured in seconds)

e. the normal QTc interval is 0.42 s.