Question

identify this rhythm

sinus bradycardia with pjc
sinus rhythm with pvc
sinus rhythm with pac
junctional tachycardia
sinus tachycardia

Explanation:

Analyze the underlying rhythm

• Heart rate: There are 6 QRS complexes over a 6-second strip, which corresponds to a heart rate of approximately \(60\text{ bpm}\) (or slightly less, with R-R intervals of the sinus beats being about 30 small boxes, corresponding to \(50\text{ bpm}\)).
• P waves: Upright, uniform P waves precede most QRS complexes with a constant PR interval, indicating a sinus origin.
• Diagnosis of underlying rhythm: Sinus Bradycardia.

Identify the premature beat

• The third QRS complex occurs prematurely.
• This premature complex has a narrow QRS configuration identical to the sinus beats, indicating it originates above the ventricles (supraventricular).
• There is no preceding P wave (or it is inverted/buried), which is characteristic of a junctional origin rather than atrial (PAC).
• Diagnosis of the ectopic beat: Premature Junctional Contraction (PJC).

Match with the options

• Combining the underlying rhythm and the premature beat yields: Sinus Bradycardia with PJC.

Answer:

• (A) Sinus Bradycardia with PJC (Correct answer)
• (B) Sinus Rhythm with PVC
• (C) Sinus Rhythm with PAC
• (D) Junctional Tachycardia
• (E) Sinus Tachycardia