Rhythm InterpretationCâu 33 / 100
An otherwise normal sinus strip contains one early narrow beat with an inverted P wave right in front of it and a PR interval of 0.08 second. What is this beat?
a.Premature atrial contraction
b.Premature ventricular contraction
c.Premature junctional contraction
d.Sinus escape beat
Giải thích
A premature junctional contraction comes from the AV junction, so the atria depolarize retrograde and produce an inverted P wave with a short PR of less than 0.12 second, while the QRS stays narrow. A premature atrial contraction has an upright though differently shaped P wave with a normal PR. A PVC is wide with no P wave, and an escape beat comes late, not early.
Luyện miễn phí toàn bộ 100 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- Which group of rhythms is considered immediately life-threatening and requires the technician to summon help right away?
- What does the QT interval measure on an EKG tracing?
- A strip shows a normal sinus beat followed by a wide bizarre beat, then another sinus beat followed by another wide bizarre beat, repeating throughout the strip. What is this pattern called?
- Which premature ventricular contraction pattern is considered most dangerous because it can trigger ventricular tachycardia or fibrillation?
- What is the correct way to determine whether a ventricular rhythm is regular?
- On standard EKG paper running at 25 mm/sec, how far apart are the vertical time markers printed at the top of the strip used for the six-second method?
Cập nhật gần nhất: · quy trình kiểm tra
Đội Ngũ Biên Tập PrepPass · Đối chiếu với NHA Certified EKG Technician (CET) Exam · Quy trình kiểm tra