2444 Exam Flashcards
What indicates infarction/injury on a 12 lead?
ST elevation
What indicates ischemia on a 12 lead?
ST depression, inverted T waves
What indicates previous cardiac injury/cardiac tissue necrosis?
Deep Q waves. (⅓ of QRS wave is MI).
What leads represent the inferior portion of the heart?
II, II, AvF
What leads represent the lateral portion of the heart?
I, AvL, V5, V6.
What leads represent the anterior portion of the heart?
V3, V4
What leads represent the septal portion of the heart?
V1, V2
The right coronary artery is represented by what leads?
II, III, and AvF
The left anterior descending (LAD) artery is represented by what leads?
V1-V6
The left circumflex artery is represented by which leads?
I, AvL
What does a P wave represent?
Atrial depolarization
How long is a normal PRI?
0.12-0.20 or 3-5 small boxes
What does a prolonged PRI indicate?
The atria is holding the charge it received from the SA node for longer than it should. Not necessarily a problem with the SA node, but the AV node.
What is the speed measurement of EKG paper?
25mm/sec. One small box represents 0.04 seconds.
What is the normal width of the QRS?
0.08-0.12 or 2-3 small boxes
What does a wide QRS indicate?
slower spread of ventricular depolarization. It is taking longer for the ventricles to contract.
What does the QRS indicate?
Ventricular depolarization
What does the T wave indicate?
Ventricular repolarization.
BP, diet, exercise, stress, and sugar intake are all examples of ____ cardiac issues
modifiable
age, race, sex, and FMHx are all examples of ____ cardiac issues
non-modifiable.
Normal conduction rate for the SA node?
60-100
Normal conduction rate for the AV node?
40-60
Normal conduction rate for the perkinje fibers?
20-40
Sinus Bradycardia?
less than 60