Interpret the following rhythm:
A) Sinus rhythm with PACs
B) Normal sinus rhythm
C) Sinus tachycardia
D) Sinus bradycardia

Question

Interpret the following rhythm: 
A) Sinus rhythm with PACs 
B) Normal sinus rhythm 
C) Sinus tachycardia 
D) Sinus bradycardia

Quizplus · Accepted Answer

The underlying rhythm is identified first.Following this step,the dysrhythmia that is occurring to disrupt the underlying rhythm is then determined.A premature atrial contraction (PAC)is a single ectopic beat arising from atrial tissue,not the sinus node.The PAC occurs earlier than the next normal beat and interrupts the regularity of the underlying rhythm.The P wave of the PAC has a different shape than the sinus P wave because it arises from a different area in the atria; it may follow or be in the T wave of the preceding normal beat.If the early P wave is in the T wave,this T wave will look different from the T wave of a normal beat.Normal sinus rhythm (NSR)reflects normal conduction of the sinus impulse through the atria and ventricles.Atrial and ventricular rates are the same and range from 60 to 100 beats per minute.Rhythm is regular or essentially regular.PR interval is 0.12 to 0.20 seconds.QRS interval is 0.06 to 0.10 seconds.P and QRS waves are consistent in shape.Sinus tachycardia results when the SA node fires faster than 100 beats per minute.Bradycardia is defined as a heart rate less than 60 beats per minute.

Interpret the Following Rhythm