Sinus Bradycardia
HR <60
Regular rhythm
Sinus Tachycardia
HR >100
Normal rhythm
Brainpower
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1st Degree Heart Block
HR normal/slow
Regular rhythm
PR Interval: prolonged
, 2nd Degree Heart Block
Type I
HR slow
Regular rhythm
PR Interval: progressively lengthening
QRS: 1 blocked QRS
2nd Degree Heart Block Type II
HR slow
Regular rhythm
PR Interval: normal/prolonged
QRS: multiple blocked QRS
3rd Degree Heart Block
HR slow