Ischemia/infarction lecture Flashcards Preview

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Flashcards in Ischemia/infarction lecture Deck (20):
1

ST segment depression- slop and depth
T wave changes- inversion

EKG criteria for ischemia

2

ST depression greater or equal to 1 mm, think...?

Myocardial ischemia

3

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...

Myocardial ichemia

4

Pts with LVH, LBBB, digoxin and Wolf-Parkinson-White abnormality.

ISCHEMIA CAN NOT BE READ ON EKG OF THESE PATIENTS

5

1. symptoms that are highly suspicious (significant chest pain!)
2. EKG changes
3. release of cardiac biomarkers

all 3 required for what dx?

MI

6

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

7

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)

8

Normal R wave, peaked ST segment and T wave

onset and first several hours

9

Peaked T waves will invert after....

6-48 hours

10

New ST segment elevation at the J point (often merging into peaked T waves) in...

2 or more contiguous leads

11

Limb leads: ST segment elevation of __ mm or more.

1 mm

12

Precordial leads: ST segment elevation of _ mm or more.

1 mm

13

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

14

With anterior wall STEMI, reciprocal changes may occur in leads

II, III, aVF

15

With inferior wall STEMI, reciprocal changes may occur in leads...

I and aVL

16

If reciprocal changes are seen in V1-V3, consider..

Posterior infarction

17

Q waves during a STEMI are greater than _____ seconds in duration

0.04

18

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.

1/3

19

Do all MIs produce Q waves?

NO

20

The presence of the following EKG abnormalities invalidate reading STEMI via EKG:

-Left Ventricular Hypertrophy
-Left Bundle Branch Block
-Wolf-Parkinson-White abnormality/syndrome