Chapter 12: Electrocardiographic Interpretation of Cardiac Muscle and Coronary Blood Flow Abnormalities: Vectorial Analysis

Chapter 12: Electrocardiographic Interpretation of Cardiac Muscle and Coronary Blood Flow Abnormalities: Vectorial Analysis

Complete Chapter Questions With Answers

Sample Questions Are Posted Below

1. A ventricular depolarization wave when traveling 210° in the frontal plane will cause a large positive deflection in:

1. aVR
2. aVL

1. Lead II

1. Lead III
2. aVF

ANS: A

Questions 2-4: A 60-year-old woman had the following EKG recorded at a local emergency room following an automobile accident. Her weight was 70 kg and her aortic blood pressure was 140/80 mmHg.

2. What is the mean electrical axis calculated from standard leads I, II, and III shown in the woman’s EKG?

1. −90°
2. −50°
3. −12°
4. +105°
5. +170°

ANS: D

3. What is the heart rate using lead I for the calculation?

1. 70
2. 88
3. 100
4. 112
5. 148

ANS: A

4. What is her likely diagnosis?

1. Mitral valve stenosis
2. Left bundle branch block
3. Pulmonary valve stenosis
4. Right bundle branch block
5. Left ventricular hypertrophy

ANS: D

5. A seventy-five year-old woman came into a local emergency room complaining of chest pain and shortness of breath. Blood samples were taken for cardiac enzyme measurements, and an EKG was quickly taken. Based on the EKG tracing shown below, what is the likely diagnosis?

1. Left bundle branch block
2. Acute anterior wall infarction in the base of the heart
3. Acute anterior wall infarction in the apex of the heart
4. Acute posterior infarction in the base of the heart
5. Acute posterior infarction in the apex of the heart

ANS: D