Advanced Dysrhythmias Practice Exam

Supraventricular tachycardia (SVT) is characterized by an elevated heart rate that originates above the ventricles, usually due to a reentrant circuit or increased automaticity in the atria or atrioventricular (AV) node. The typical heart rate range of SVT is generally between 150 to 250 beats per minute, which is defined by this rapid, often regular rhythm. This high rate is attributed to the mechanisms that lead to SVT, where there is a disruption in the normal conduction pathways, allowing for the heart to beat more quickly than usual.

In contrast, the ranges provided in the other choices do not align with the expected heart rate for SVT. A heart rate of 60 to 100 beats per minute aligns with normal sinus rhythm rather than any form of tachycardia. A range of 100 to 150 beats per minute approaches the lower end of tachycardia but still falls short of defining SVT, which indicates a more rapid heart rate. Lastly, a rate of 250 to 300 beats per minute is typically associated with other conditions, such as atrial flutter with a rapid ventricular response, rather than the classic definition of SVT. Therefore, the correct heart