Rhythm Interpretation第 13 / 100 题
A monitor strip shows a sawtooth baseline with regular atrial waves at about 300 per minute and a QRS after every fourth sawtooth wave. What is this rhythm?
a.Atrial fibrillation
b.Sinus tachycardia with artifact
c.Atrial flutter with 4:1 conduction
d.Third-degree AV block
解析
Atrial flutter produces uniform sawtooth flutter waves, classically at 250 to 350 per minute, and the AV node blocks most of them so that only every second, third, or fourth impulse reaches the ventricles. Atrial fibrillation has a chaotic rather than uniform baseline. Sinus tachycardia has discrete P waves, and third-degree block shows normal P waves that are completely unrelated to the QRS complexes.
免费刷完整 100 道题库 — 无需注册。
同考点相关题目
- A patient with a fever of 103 degrees Fahrenheit has a regular rhythm at 124 beats per minute with an upright P wave before every narrow QRS. What is this rhythm?
- A pediatric strip shows upright P waves before every narrow QRS, a PR interval of 0.14 second, and R-R intervals that shorten with inhalation and lengthen with exhalation. What is this rhythm?
- A strip shows no identifiable P waves, a wavy chaotic baseline, narrow QRS complexes, and R-R intervals that vary from beat to beat with no pattern. What is this rhythm?
- An otherwise regular sinus strip contains one early beat with a P wave shaped differently from the others, followed by a normal narrow QRS and then a pause. What is the early beat?
- A patient reports sudden palpitations. The strip shows a perfectly regular narrow-complex rhythm at 180 beats per minute with P waves that cannot be identified. What is the most likely rhythm?
- A strip shows a regular rhythm at 45 beats per minute with narrow QRS complexes and inverted P waves appearing immediately after each QRS. What is this rhythm?