Question

identify this rhythm

2nd degree type ii heart block
sinus bradycardia
sinus tachycardia
normal sinus rhythm
supraventricular tachycardia

Explanation:

Analyze the heart rate and rhythm regularity

The R-R intervals are regular. There are 6-second markers (black tick marks at the top) showing a total of 8 QRS complexes across approximately 10 seconds, or more precisely, the R-R interval is about 37 small boxes (7.4 large boxes).

$$ \text{Heart Rate} = \frac{300}{7.4} \approx 40.5\text{ bpm} $$

Evaluate P waves and PR interval

Each QRS complex is preceded by a normal, upright P wave with a constant PR interval (about 4 small boxes, or 0.16 seconds). This indicates a sinus origin.

Determine the rhythm classification

A regular sinus rhythm with a heart rate below 60 bpm (specifically \(\approx 41\text{ bpm}\)) is classified as Sinus Bradycardia.

Answer:

• 2nd Degree Type II Heart Block
• Sinus Bradycardia (Correct answer)
• Sinus Tachycardia
• Normal Sinus Rhythm
• Supraventricular Tachycardia