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Chapter 10

QuestionAnswer
You have run a 12-lead ECG on Ms. Reilly, a patient in the cardiac care unit of the hospital where you work. A portion of the V1 tracing is shown here. What cardiac condition would you suspect based on this tracing? Right bundle branch block
What two characteristics must be present in lead V1 to confirm the presence of bundle branch block? evidence of P waves and QRS complexes that measure 0.12 second or more
What measurement on the ECG tracing represents how long it takes for the current to travel through the ventricular myocardial tissue? QRS duration
You observe a wide QRS complex in lead II. Which lead should you check to evaluate the location of the bundle branch block? Lead V1
To determine whether bundle branch block is present, which lead should be analyzed? Lead V1
A patient’s dysrhythmia originates from above the ventricles and you notice QRS complexes on the ECG tracing measuring 0.12 second or greater. What could be the cause of this abnormal morphology? Bundle branch block
What is the condition in which impulses generated in the atria are delayed because of damage in the ventricular electrical pathways? Bundle branch block
A bundle branch block has which of the following characteristics? It occurs when the bundle branches fail to conduct impulses.
What rhythm is shown in this ECG tracing? Sinus bradycardia with bundle branch block
Where can right and left bundle branch blocks be differentiated? In the precordial leads
How is a right bundle branch block (RBBB) distinguished from a left bundle branch block (LBBB)? Monitor lead V1. If the majority of the ventricular depolarization is positively deflected, it is RBBB; if the QRS is negative, it is LBBB
Bundle branch block rhythm is similar to a sinus rhythm but has what distinguishing characteristic? QRS duration greater than 0.12 seconds
You are about to perform an ECG on a patient known to have sinus tachycardia with right bundle branch block. Which of the following signs and symptoms would you be likely to find in this patient? Rapid heart rate
What additional patient information is needed on the ECG tracing when a bundle branch block is discovered? Patient’s underlying rhythm
What happens when one or both of the ventricular pathways are not functioning properly due to damage or a delay from cardiac disease, drugs, or other conditions? A bundle branch block occurs
You have run a 12-lead ECG on Mrs. Simmons. In lead V1, you notice that the QRS is positive and has a “bunny ears” appearance. What does Mrs. Simmons most likely have? Right bundle branch block
In a right bundle branch block (RBBB), how does the QRS appear? Positively deflected
A bundle branch block must be considered when the QRS complex measures what length? 0.12 seconds or greater
Which lead is referenced to distinguish a right bundle branch block (RBBB) from a left bundle branch block (LBBB)? V1
Created by: SHAMCK9388
 

 



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