A rapid contraction of the atria yielding a heart rate of 250 to 350 beats per minute and displaying a sawtooth pattern on an ECG is called:
a. ventricular flutter c. atrial fibrillation
b. tachycardia d. atrial flutter
D
Atrial flutter, a rapid contraction of the atria, yields a HR of 250 to 350 beats per minute. The ECG displays a sawtooth wave pattern. The AV node attempts to block some of the atrial impulses, but usually the ventricles are also contracting at a rate of 300 beats per minute. This causes a decreased blood supply to the body because the atria and ventricles are unable to fill with blood when they are contracting at such a fast rate. This requires immediate intervention.
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