Question

question 2 of 25
identify this rhythm
sinus rhythm with 1st degree heart block
accelerated junctional rhythm
sinus bradycardia
idioventricular rhythm
junctional escape rhythm

Explanation:

Analyze the ECG strip characteristics

• P waves: Present, upright, and preceding every QRS complex.
• PR interval: Consistently prolonged, measuring approximately 8 small boxes (\(0.32\text{ s}\)), which is significantly greater than the normal upper limit of \(0.20\text{ s}\) (5 small boxes).
• QRS complexes: Narrow and regular.
• Heart rate: Approximately 50–55 bpm (bradycardic but regular sinus-driven rhythm with delayed conduction).

Correlate findings with diagnostic criteria

• The presence of a 1:1 P-to-QRS ratio with a constant, prolonged PR interval (\(>0.20\text{ s}\)) is the defining hallmark of a first-degree atrioventricular (AV) block.
• This matches the option "Sinus Rhythm with 1st degree Heart Block".

Answer:

• (A) Sinus Rhythm with 1st degree Heart Block (Correct answer)
• (B) Accelerated Junctional Rhythm
• (C) Sinus Bradycardia
• (D) Idioventricular Rhythm
• (E) Junctional Escape Rhythm