EKG第 78 / 100 题
A tracing shows a uniform, thick, fuzzy line with small regular spikes about 60 times per second. This artifact is most consistent with:
a.Somatic tremor
b.Sixty-cycle (AC) electrical interference
c.Wandering baseline
d.Normal sinus rhythm
解析
Sixty-cycle interference (AC interference) produces a uniform series of small, regular spikes from nearby electrical equipment or improper grounding. Unplugging non-essential electrical devices and checking cables and grounding can reduce it. It is distinguished from muscle tremor, which is irregular.
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