Lecture 17: Normal ECG Flashcards
Where is P wave always inverted?
aVR
-since atria is depolarized right to left
If the PR interval is not between 0.12-0.2 seconds, what can that be indicative of?
First AV nodal block
If QRS complex is longer than 0.12 seconds, what can that be indicative of?
Bundle Branch Block
Hypertrophy
If ST segment is depressed more than 0.5 mm, what can that mean?
Subendocardial injury
If ST segment is elevated more than 0.5 mm, what can that mean?
Subepicardial injury
What can abnormal QT intervals be associated with?
Myocardial ischemia, injury, or infarction
What can an abnormal T wave be associated with?
Hyperkalemia
If lead 1 and aVF are both positive, what is the axis?
Normal: 0-90 deg
If lead 1 is negative and aVF is positive, what is the axis?
RAD: greater than 90 deg
-right axis deviation
If lead 1 is positive and aVF is negative, what is the axis?
LAD: less than 0 deg
-left axis deviation
What can cause left axis deviation?
Pregnancy
Tumor
Blocks
Chronic lung disease
What can cause right axis deviation?
COPD
Chronic lung disease
A fat, broad P wave can be indicative of what?
Mitral disease
A flat P wave can be indicative of what?
P-pulmonale
-lung issue
An inverted P wave can be indicative of what?
AV junctional rhythm
What is tachycardia?
Heart Rate >100 bpm
What is bradycardia?
Heart Rate <60 bpm
What can no P waves indicate?
Atrial fibrillation Atrial flutter Junctional or ventricular escape rhythm Junctional tachycardia VT