Rhythm Interpretation第 8 / 100 题
Which set of findings meets the criteria for normal sinus rhythm?
a.Rate 110, regular, one upright P wave per QRS, PR 0.16 second
b.Rate 80, irregular, P waves absent, QRS 0.08 second
c.Rate 50, regular, inverted P waves, PR 0.10 second
d.Rate 80, regular, one upright P wave before every QRS, PR 0.16 second, QRS 0.08 second
解析
Normal sinus rhythm requires a rate of 60 to 100, a regular rhythm, one upright P wave in front of every QRS, a PR interval of 0.12 to 0.20 second, and a QRS under 0.12 second. A rate of 110 is sinus tachycardia, absent P waves with an irregular rhythm suggests atrial fibrillation, and a rate of 50 with inverted P waves and a short PR points to a junctional rhythm.
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