Interpret the following rhythm:

A) Normal pacemaker function
B) Failure to capture
C) Failure to pace
D) Failure to sense

Question

Interpret the following rhythm:

A) Normal pacemaker function 
B) Failure to capture 
C) Failure to pace 
D) Failure to sense

Quizplus · Accepted Answer

Failure to pace or fire occurs when the pacemaker fails to initiate an electrical stimulus when it should fire.The problem is noted by absence of pacer spikes on the rhythm strip.Note that after the 3-second mark,the pacemaker failed to fire.When the pacemaker generates an electrical impulse (pacer spike)and no depolarization is noted,it is described as a failure to capture.On the ECG,a pacer spike is noted,but it is not followed by a P wave (atrial pacemaker)or a QRS complex (ventricular pacemaker)within the appropriate time frame.When the pacemaker does not sense the patient's own cardiac rhythm and initiates an electrical impulse,it is called failure to sense.Failure to sense manifests as pacer spikes that fall too closely to the patient's own rhythm,earlier than the programmed rate.This is not normal pacemaker function.

Interpret the Following Rhythm