CH 9: Infarction & Hemiblock Flashcards Preview

EKG > CH 9: Infarction & Hemiblock > Flashcards

Flashcards in CH 9: Infarction & Hemiblock Deck (18):
1

Ischemia is characterized by

inverted t-waves esp in V2-V6

2

Transient t-wave inversion

associated w/ angina

3

Wellens Syndrome

-marked stenos is leads V2 and V3
-stenosis of the anterior descending coronary

4

Injury is indicated by

elevation of the ST segment (ACUTE)
-also present in Prinzmetals angina

5

non-Q wave infarction

small infarction that may herald an impending larger infarction

6

ventricular aneurysm

can cause persistent ST elevation in most of the chest leads

7

Brugada Syndrome

-RBBB pattern QRS w/ ST elevation in V1 and V3
-sudden cardiac arrest (in the absence of coronary obstruction)
-caused by dysfunctional cardiac Na+ channels

8

Pericarditis

-ST segment is elevated and usually flat or concave
-resolves w/ time

9

ST segment depression

-subendocardial infarction
-positive stress test
-digitalis
-anginga (temporary)

10

Subendocardial infarction

-type of non q-wave infarction

11

Necrosis is indicated by

Q waves

12

Insignificant Q waves

see pg 273

13

Significant Q waves

-1mm wide
OR
-1/3 of QRS amplitude

14

When looking at leads for q waves

omit lead AVR

15

Anterior Infarct

Q wave in leads V1-V4
(very deadly)
-caused by occlusion of the anterior descending branch of the left coronary artery

16

Lateral Infarct

Q waves in leads I and AVL
-caused by occlusion of the circumflex branch of the left coronary artery

17

Inferior Infarct

Q waves in leads II,III, AVF
-caused by right or left coronary artery deepening which artery is dominant

18

Posterior Infarction

large R wave (the opposite of a Q wave) in V1 and V2
(if acute there is also ST DEPRESSION)
-generally caused by an occlusion of the right coronary artery or one of its branches (often associated w/ serious arrhythmias)