EKG I & II Flashcards
(38 cards)
Depolarization of the atria in response to SA node triggering is represented by the ____
P wave
Delay of the AV node to allow filling of the ventricles is represented by the ____
PR interval
Ventricular repolarization is represented by the ____
T wave
Depolarization of the ventricles is represented by the ____.
(time from AV node thru Purkinjie fibers)
QRS complex
____ is the beginning of ventricle repolarization, and should be flat
ST segment
P wave can be inverted in lead ___
aVR
What is the length of a normal P wave
< 0.12 seconds
or <3 boxes
A broad or notched P wave in leads II or V1 is a sign of ______
left atrial enlargement
Peaked P waves in leads II or V1 is a sign of ______
right atrial enlargement
An ectopic inverted P wave is a sign that the site of origin of contraction is from ___
lower atria or AV junction
An ectopic upright P wave is a sign that the site of origin of contraction is from ___
high in the atria
Normal duration of the PR interval is ___ seconds or ____ boxes.
< 0.20 seconds 1 large (5 small) boxes
Normal duration of the QRS complex is ____ seconds or ____ boxes.
< 0.12 seconds
< 3 small boxes
Q wave should be < __ boxes in amplitude and < __ box in duration
< 2 amplitude
< 1 duration
Abnormal (larger) Q waves indicate ____
prior or current MI
RSR’ indicates a ____
bundle branch block
ST elevations in specific leads indicate ____, while diffuse ST elevations indicate ____.
- MI
- pericarditis
ST depressions indicate ____
myocardial ischemia
Peaked T waves may suggest ____ or ____
- MI
- hyperkalemia
Inverted T waves may suggest ______
- cardiac ischemia
- LVH
- hypokalemia
- digitalis administration
Normal QT interval should be ____ seconds
< 500ms (0.5 sec)
QT interval shortening can be due to ____
hypercalcemia
Prolonged or shortened QT intervals both increase risk of ____
ventricular tachycardia (Torsades)
U waves are more common in ___
young athletes
