• Supraventricular tachycardia has such a fast rate that the P waves may not be seen. They are frequently buried in the T waves.

Rate: 150–250 bpm

Rhythm: Regular

P Waves: Frequently buried in preceding T waves and difficult to see

PR Interval: Usually not possible to measure

QRS: Normal (0.06–0.10 sec) but may be wide if abnormally conducted through the ventricles

Clinical Tip: SVT may be related to caffeine intake, nicotine, stress, or anxiety in healthy adults.

Clinical Tip: Some patients may experience angina, hypotension, lightheadedness, palpitations, and intense anxiety.