Lecture 25: Myocardial Infarctions

Question 1

What are some symptoms of a MI?

Answer 1

• Heavy, crushing pressure on chest
• Radiating into neck, jaw, left arm, shoulder blades
• Nausea, vomiting, diaphoresis (sweating), dyspnea
• Women can have silent symptoms

Question 2

What causes an MI?

Answer 2

Narrowing or blockage of a coronary artery

-atherosclerosis

Question 3

What can happen to ST segment during an MI?

Answer 3

Inverted T waves
Tall, peaked T waves
ST elevation

Question 4

What are some biomarkers of necrosis associated with a MI?

Answer 4

Myoglobin
CK
Troponin I or T
CK-MB

Question 5

What are some hallmarks of a NSTEMI (non ST segment elevation MI)

Answer 5

Elevated troponin, CK, CK-MB

• no ST segment elevation
• can have ST depression or T wave inversion

Question 6

What are hallmarks of an acute myocardial infarction?

Answer 6

Complete interruption of blood flow

-ST segment elevation

Question 7

If there is an anterior wall infarction, what artery is compromised? What leads will recognize this?

Answer 7

Left anterior interventricular artery (LAD)

-Leads V1-V7

Question 8

If there is an inferior wall infarction, what artery is compromised? What leads will recognize this?

Answer 8

Right coronary artery

-Leads II, III, aVF

Question 9

If there is a lateral wall infarction, what artery is compromised? What leads will recognize this?

Answer 9

Circumflex artery from LCA

-Leads I, aVL, V5, V6

Question 10

If there is a posterior wall infarction, what artery is compromised? What leads will recognize this?

Answer 10

Posterior Descending Artery

-Leads V1-V3