Các tiêu chuẩn ECG cho VH có độ nhạy và độ đặc hiệu của ít nhất 95%. E. Không có những điều trên. Trả lời: Một Khoảng một nửa của tất cả các bệnh nhân bị phì đại tâm thất sẽ không đáp ứng các tiêu chuẩn ECG và có thể đi không được công nhận. | Chapter IV I Chamber Enlargement Q1 When using the ECG criteria for diagnosing ventricular hypertrophy VH which of the following is correct A. The patient most likely has VH if the ECG criteria are met. B. The patient is free from VH if the ECG does not meet the criteria. C. The Cornell Voltage Criteria should be used because of their excellent sensitivity. D. The ECG criteria for VH have a sensitivity and specificity of at least 95 . E. None of the above. Answer A About half of all patients with ventricular hypertrophy will not meet the ECG criteria and may go unrecognized. This is because of the relatively low sensitivity 50 . Q2 In Left Atrial Enlargement the P wave A. increases in amplitude. B. increases in duration. C. increases in both amplitude and duration. D. shows terminal P negativity in lead I. E. all of the above. Answer B LAE causes a P wave duration in the frontal plane. The P wave is also notched. Also in LAE Lead V1 shows terminal P negativity. Q3 When interpreting an ECG right ventricular hypertrophy RVH can mimic which of the following conditions A. LBBB B. AV block C. True posterior MI D. LAfB E. LPFB Answer C The prominent anterior forces seen in RVH are also seen in a number of other conditions including a true posterior MI. Thus RVH is sometimes referred to as a pseudoinfarct. RBBB and WPW could also result in prominent anterior forces but they may be distinguished in other ways. rSR morphology in V1 delta waves and short PR. 21 Q4 What is the correct diagnosis of this ECG A. LVH B. RVH C. LAE D. RAE E. Bi-atrial enlargement Answer C LAE is best seen in V1 with a prominent negative posterior component measuring 1mm wide and 1mm deep. Q5 What is the correct diagnosis of this ECG A. LAE B. LVH C. Bi-atrial enlargement D. LAE and LVH E. RAE and RVH 22 Answer E RAE is recognized by the tall P waves in leads II III aVF. RVH is likely because of right axis deviation 100 degrees and the Qr or rSR complexes in V1 and V2. Q6 Other than 1st
