Question

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 greater than the normal upper limit of \(0.20\text{ s}\) (5 small boxes).
• QRS complexes: Narrow (under \(0.12\text{ s}\)) and regular.
• Heart rate: Approximately 60 beats per minute (regular R-R intervals of about 25 small boxes).

Evaluate the diagnostic criteria

• Regular rhythm with upright P waves indicates a sinus origin.
• A constant, prolonged PR interval (\(>0.20\text{ s}\)) with a 1:1 P-to-QRS conduction ratio is the defining hallmark of a first-degree atrioventricular (AV) block.

Match with the given options

• The combination of a normal sinus rhythm with a prolonged PR interval corresponds to "Sinus Rhythm with 1st degree Heart Block".

Answer:

• Sinus Rhythm with 1st degree Heart Block (Correct answer)
• Accelerated Junctional Rhythm
• Sinus Bradycardia
• Idioventricular Rhythm
• Junctional Escape Rhythm