ECG Flashcards
What direction should aVR always be in a normal EKG?
Downgoing
What are 2 ways to determine the rate from an EKG?
- Count the # of QRS complexes in the rhythm strip. Multiply by 6.
- Count the number of “big boxes” in an R-R interval. Divide 300 by this number.
How do you determine if the rhythm of an ECG is normal?
QU: there should be a p-wave before every QRS complex and a QRS complex after every p-wave
How do you document abnormal rhythms? (3)
Sinus arrythmia
Atrial Fib
Ventricular Fib / tachycardia
With regards to the QRS comples:
- What does a negative deflection on an EKG mean?
- What does a positive deflection mean on an EKG?
- What does both a positive and negative deflection of QRS mean?
- The electrical current is moving away from the lead
- The electrical current is moving toward the lead
- The electrical current is moving exactly perpindicular to the lead
In general, if the QRS complex is positive in both lead 1 and aVF, then the EKG is […]
Normal
If you can find the isoelectric lead, what does this tell you about the electrical axis of the heart?
It must be perpindicular to this lead
What is a normal PR interval?
120ms - 200ms
What is a normal QRS interval?
60ms - 100ms
What is a normal QT interval?
Roughly less than half the RR interval
< 440ms
What is a prolonged QT interval associated with?
Sudden cardiac death
- Lead 1, aVL and V5 detect electrical activity from the […] part of the heart that is supplied by the […] artery
- Leads 2, 3 and aVF detect electrical activity from the […] part of the heart that is supplied by the […] artery
- Leads V1 and V2 detect electrical activity from the […] part of the heart that is supplied by the […] artery