PCT EKG (General #2)

Which lead is the most affected by respiration?

• A. V2

• B. V4

• C. Lead III

• D. Lead I

Which of the following is the correct sequence by which action potentials are conducted through the heart?

• A. SA node-AV node-bundle branches- purkinje fibers

• B. Bundle branches-Purkinje fibers-SA node-AV node

• C. Purkinje fibers- SA node- Bundle branches- AV node

• D. AV node- SA node- bundle branches- Purkinje fivers

When calibrating an ECG machine, what is the standard size of the calibration mark representing the sensitivity of the ECG machine?

• A. 5 mm in height

• B. 10 mm in height

• C. 15 mm in height

• D. 20 mm in height

How many leaflets does the mitral valve have?

• A. one

• B. two

• C. three

• D. four

The right and left coronary arteries branch off of which blood vessel?

• a. ascending aorta

• b. descending aorta

• c. pulmonary artery

• d. posterior descending artery

The PR interval progresses until a QRS is dropped and the pattern repeats itself. Which EKG rhythm is this an example of?

• a. atrial flutter

• b. ventricular tachycardia

• c, Mobitz 1

• d. sinus bradycardia

A condition in which the lower chambers of the heart (ventricles) beat very quickly.

• a. ventricular fibrillation

• b. ventricular tachycardia

• c. atrial flutter

• d. atrial fibrillation

A sinus rhythm with an elevated rate of impulses, defined as a rate greater than 100 beats/min (bpm) in an average adult.

• a. sinus bradycardia

• sinus dysrhythmia

• c. asystole

• d. sinus tachycardia

Problems with the electrical system of the heart can cause this abnormality:

• (A) A lack of blood to pump through the body

• (B) Myocardial infarction

• (C) Extremely slow heart rate

• (D) A lack of oxygen in the blood

In rhythms originating in junctional tissue, P waves are often _______________ or _________________ .

• (A) Short, widened

• (B) Tall, narrowed

• (C) Inverted, absent

• (D) Retrograde, transient