12-Lead ECG (2nd Edition) Edit edition

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Solutions for Chapter 11…

Electrocardiography (ECG) is a painless medical procedure performed to monitor the electrical activity of the heart. The ECG report consists of three different components such as P wave, QRS complex, and T wave. The QRS complex denotes ventricular depolarization.

The QRS complex is the highest spike seen in the normal ECG. It is important to consider the amplitude while evaluating the QRS complex. The amplitude of the QRS complex is influenced by the action potential generated by the heart. A larger amplitude may result from ventricular hypertrophy, where the ventricles are enlarged.

Hence, option A. is not the correct answer.

It is necessary to consider the morphology while evaluating the QRS complex. The width of a normal QRS complex is 70-100ms. If the width of the QRS complex is greater than 100ms, it is known as a broad complex. This may occur due to bundle branch block.

Hence, option B. is not the correct answer.

The Q wave is the beginning downward stroke of the QRS complex. It is important to consider the amplitude and duration of the Q wave during the diagnosis of myocardial infarction.

Hence, option C. is not the correct answer.

It is necessary to consider the frontal plane axis because it denotes the changes in the pattern of ventricular activation. It may also aid in the diagnosis of heart tissue damage.

Hence, option D. is not the correct answer.

The period between the P wave beginning and the Q wave is known as the PR interval. The duration of the PR interval is 120-200ms. It is not necessary to consider the length of the PR interval while evaluating the QRS complex.

Hence, the correct answer is option E.