Exam 9: Introduction to the 12-Lead ECG

Lead I views the _____.

Lead II views the _____ wall of the left ventricle.

Which leads look at adjoining tissue in the anterior region of the left ventricle?

Hypertrophy refers to a(n)_____.

Poor R-wave progression is a phrase used to describe R waves that decrease in size from V₁ to V₄.This is often seen in an _____ infarction.

Patients who experience a(n)_____ myocardial infarction have a greater incidence of heart failure and cardiogenic shock than those who have myocardial infarctions affecting other areas of the left ventricle.

When reviewing a 12-lead ECG,intervals and duration are usually expressed in _____.

Lead V₁ views the _____.

The chest leads are the only unipolar leads in the standard 12-lead ECG.

List the ECG leads that view the heart in the horizontal plane,allowing a view of the front and left side of the heart.

Indicative ECG changes observed in leads V₁,V₂,V₃,and V₄ suggest that the _____ wall of the _____ ventricle is affected.

Lead aVL views the _____.

List six leads that view the heart in the frontal plane.

The axes of leads I,II,and III form an equilateral triangle with the heart at the center (Einthoven's triangle).If the augmented limb leads are added to this configuration and the axes of the six leads moved in a way in which they bisect each other,the result is the _____ _____ _____.

Which of the following ECG changes is one of the earliest to occur during an ST-elevation infarction,but may have resolved by the time the patient seeks medical assistance?

When you read a 12-lead ECG from left to right,the ECG tracing is continuous.