On inspection of an electrocardiographic rhythm strip, you note the following occurring in sus-tained "bursts" over 2 to 3 min: a rate of 195;
regular rhythm; P waves and PR intervals not easily discernible; normal QRS complexes (a few are widened). What is most likely the problem?
a. Ventricular tachycardia
b. Premature ventricular contractions
c. Atrial fibrillation
d. Supraventricular tachycardia (SVT)
ANS: D
Typically, this form of SVT results in heart rates between 160 and 220 beats/min. The rhythm is regular, which distinguishes it from rapid atrial fibrillation. However, because of its rapid rate, P waves may not be seen. If identifiable, the P waves appear abnormal. In addition to the rate and regular rhythm, SVT is characterized by a normal QRS complex.
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