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Normal sinus rhythm
Regular R to R
• 60-100 beats per minute
• Uniform P wave proceeds every QRS
• PR interval between .12-.20 seconds (<5 squares, if more 1st degree)
• QRS measures less than .12 seconds
Normal Sinus rythym

Sinus Tachycardia
Regular R to R
• 100-150 beats per minute
• Uniform P wave proceeds every QRS
• PR interval between .12-.20 seconds
• QRS measures less than .12 seconds
Sinus tachycardia

Sinus bradycardia
Regular R to R
• Less than 60 beats per minute
• Uniform P wave proceeds every QRS
• PR interval between .12-.20 seconds
• QRS measures less than .12 seconds
Sinus bradycardia
