Exam 9: Introduction to the 12-Lead Electrocardiogram

A standard 12-lead ECG provides views of the heart in _____.

Which leads face the septum?

Lead V₅ views the _____ wall of the left ventricle.

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

Acute coronary syndromes consist of three major syndromes that are related. List the three syndromes.

The inferior wall of the left ventricle is supplied by the _____ coronary artery in most of the population.

Lead II views the _____ wall of the left ventricle.

An ECG machine's sensitivity must be calibrated so that a 1-millivolt electrical signal will produce a deflection measuring exactly _____ mm tall.

Placement of right chest leads is identical to the standard chest leads except on the right side of the chest.

Normal electrical axis lies between _____ degrees.

Which of the following leads should be used to view the right ventricle? A) V3 B) V7 C) V4R D) V6

Explain the meaning of the letters in aVR, aVL, and aVF.

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

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

Lead V? views the _____.

Hypertrophy refers to a(n) _____.

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

Completion -The coronary arteries originate at the base of 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?

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