How would you differentiate a junctional escape rhythm at 40 beats/min from a ventricular escape rhythm at the same rate?
a. It is impossible to differentiate a junctional escape rhythm from a ventricular escape rhythm.
b. The junctional escape rhythm will have a narrow QRS complex; the ventricular escape rhythm will have a wide QRS complex.
c. The rate (40 beats/min) would indicate a junctional escape rhythm, not a ventricular escape rhythm.
d. The junctional escape rhythm will have a wide QRS complex; the ventricular escape rhythm will have a narrow QRS complex.
B
Although junctional and ventricular rhythms are ectopic pacemaker sites, their rhythms can generally be differentiated by the width of their QRS complexes. The junctional escape rhythm will have a narrow QRS complex; the ventricular escape rhythm will have a wide QRS complex.
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