Flashcards in Ischemia/infarction lecture Deck (20):
ST segment depression- slop and depth
T wave changes- inversion
EKG criteria for ischemia
ST depression greater or equal to 1 mm, think...?
Greater than 1 mm ST segment depression that is horizontal or downsloping in one or more leads and persists for more than .08 seconds beyond the J point is highly suggestive of...
Pts with LVH, LBBB, digoxin and Wolf-Parkinson-White abnormality.
ISCHEMIA CAN NOT BE READ ON EKG OF THESE PATIENTS
1. symptoms that are highly suspicious (significant chest pain!)
2. EKG changes
3. release of cardiac biomarkers
all 3 required for what dx?
Other causes of ST segment depression include metabolic abnormalities (hypokalemia, etc.), drug effects (digoxin, others) and more. ST segment depression of
"non specific" ST changes
First EKG change seen (within minutes) of an MI
hyper acute T waves
(myocardial cells injure, which release potassium and causes a peaked T wave)
Normal R wave, peaked ST segment and T wave
onset and first several hours
Peaked T waves will invert after....
New ST segment elevation at the J point (often merging into peaked T waves) in...
2 or more contiguous leads
Limb leads: ST segment elevation of __ mm or more.
Precordial leads: ST segment elevation of _ mm or more.
Leads at a distance from those showing ST segment elevation may show changes that are opposite those in the infarct leads: ST segment depression and T wave inversion.
Reciprocal changes with STEMI
With anterior wall STEMI, reciprocal changes may occur in leads
II, III, aVF
With inferior wall STEMI, reciprocal changes may occur in leads...
I and aVL
If reciprocal changes are seen in V1-V3, consider..
Q waves during a STEMI are greater than _____ seconds in duration
During a STEMI....
If Q wave is followed by an R wave, the Q wave must be at least _____ the height of the R wave in the same QRS complex.
Do all MIs produce Q waves?