Exam 10: Posttest

In the limb leads, the ST segment is normally isoelectric.

Explain the difference between a PVC and a ventricular escape beat.

In most ECG leads, a normal Q wave is less than 0.04 second in duration and less than one third of the amplitude of the R wave in that lead.

Completion -A _____ bundle branch block produces a QS pattern in lead V₁.

Describe the appearance of a pathologic Q wave.

List five signs or symptoms of decreased cardiac output.

Completion -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 _______________.

In an adult, the normal duration of the QRS complex is _____ seconds.

Cardiac output is the amount of blood pumped into the aorta each minute by the heart.

Which of the following leads are anatomically contiguous?

How are frequent PACs usually managed?

Depolarization is the same as contraction.

The first segment of the left coronary artery is the _____ artery.

The _____ originate from small mounds of myocardium called papillary muscles and serve as anchors to prevent the cusps of the AV valves from inverting into the atria.

In a junctional rhythm viewed in lead II, where is the location of the P wave on the ECG if ventricular depolarization precedes atrial depolarization?

Signs and symptoms experienced during a tachydysrhythmia are usually primarily related to _____.

Completion -A QRS measuring 0.10 to 0.12 second is called a(n) _____ right or left bundle branch block.

Indicate the inherent rates for each of the following pacemaker sites:

A delay or block that occurs in one of the bundle branches affects ventricular depolarization.

Individuals with preexcitation syndrome are predisposed to tachydysrhythmias.