Question

identify this rhythm

supraventricular tachycardia
junctional tachycardia
normal sinus rhythm
sinus tachycardia
sinus bradycardia

Explanation:

Analyze the heart rate and rhythm regularity

The R-R intervals are regular. There are 3 large boxes between consecutive R waves, which corresponds to a heart rate of:

$$ \text{Heart Rate} = \frac{300}{3} = 100\text{ bpm} $$

Examine P-wave morphology and PR interval

Each QRS complex is preceded by a normal, upright P wave in this lead. The PR interval is constant and within normal limits (approximately 0.16 seconds or 4 small boxes).

Determine the rhythm classification

A regular rhythm at a rate of approximately 100 bpm (or slightly above) with normal upright P waves and normal PR intervals is classified as Sinus Tachycardia.

Answer:

• Supraventricular Tachycardia
• Junctional Tachycardia
• Normal Sinus Rhythm
• Sinus Tachycardia (Correct answer)
• Sinus Bradycardia