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RES 280 test 4

Interpreting the ECG

Which of the following criteria applies to third-degree block? There is no relationship between the P waves and the QRS complexes.
What is implied by an abnormally prolonged PR interval? Atrioventricular block
Why is the electrical impulse temporarily delayed at the atrioventricular (AV) node? To allow better filling of the ventricles.
Which of the following medications is used to treat sinus bradycardia? Atropine
What term is used to define the ability of certain cardiac cells to depolarize without stimulation? Automaticity
Which of the following ECG abnormalities is most life threatening? Elevated ST segment
Which of the following axis placements represents right-axis deviation? +120
ECG rhythm strip from an adult patient, you notice the following: regular sawtooth-like waves occurring at a rate of 280/min and a regular ventricular rhythm occurring at a rate of about 140/min. the most likely interpretation? Atrial flutter
What is suggested by inverted T waves on the ECG? Myocardial ischemia
What structure normally paces the healthy heart? Sinoatrial (SA) node
Atrial flutter is considered to be a life-threatening arrhythmi False
Sources for the electrical impulse that triggers cardiac contraction that lie outside the sinoatrial node are referred to as ectopic foci. True
Which of the following is NOT a common characteristic of a premature ventricular complex (PVC)? Narrow QRS
Valvular defects in the heart can be detected with a 12-lead ECG. False
Which of the following is NOT a common cause of ventricular tachycardia? Pericarditis
At what part of the cardiac conduction system does the electrical impulse travel most rapidly? Purkinje fibers
What medication is most useful for the treatment of premature ventricular contractions? Lidocaine
The ECG you are looking at has one P wave for every QRS complex and the PR interval is 0.30 second. What is your interpretation? First-degree heart block
Which of the following waves represents depolarization of the ventricles? QRS wave
What is the width of the normal QRS complex? Not wider than 3 mm
Which of the following waves represents repolarization of the ventricles? T
For which of the following arrhythmias would an electronic pacemaker be indicated? Third-degree block
Your patient has a normal ECG reading. What does this finding tell you about the patient's likelihood of having a myocardial infarction in the immediate future? No predictive value
What is the normal maximum length of the P wave? 3 mm
Which of the following clinical conditions is not associated with tachycardia? Hypothermia
The electrocardiogram (ECG) is primarily used to evaluate the patient with symptoms suggestive of acute myocardial disease. True
What is a possible serious complication associated with atrial fibrillation? Atrial thrombi
What is the normal period of time for the PR interval? Not longer than 0.20 second
What structure serves as the backup pacemaker for the heart? atrioventricular (AV) node
What parameter is measured on the vertical axis of the ECG paper? Voltage
An occasional premature ventricular complex (PVC) is not of major concern. True
What condition is often associated with right-axis deviation? Cor pulmonale
The QRS of an ECG falls on a dark vertical line of the ECG paper. Subsequent QRS complexes fall on every other dark line (10 mm apart). What is the ventricular rate? 150/min
What type of medications may lead to first-degree heart block? ß-blockers
Created by: Cam1228