ECG III cont.

Question 1

What may induce currents into the electrode lead wires that cause them to heat and cause thermal injuries to patients?

Answer 1

RF electromagnetic radiation

Question 2

How do you prevent thermal burns to patient from electrodes? (2)

Answer 2

• Make sure there are no loops of electrode wires.
• Keep them close to one another

–because induced current is proportional to the area of loop formed by the wire.

Question 3

What does this picture depict?

Answer 3

electrocautery interference

Question 4

What does this picture depict?

Answer 4

slow electrode displacement

Question 5

Damaged myocytes appear depolarized all of the time. True or false?

Answer 5

True

Question 6

Current flows between injured (_____ polarity tissue) and ______ normal tissue.

Answer 6

negative

positive

Question 7

Answer 7

Ischemia cause inversion of t wave due to altered repolarization.

Question 8

Where is the J point?

Answer 8

Question 9

Answer 9

Question 10

What is depression of the J point?

Answer 10

0.5 mV

Question 11

Answer 11

Question 12

Answer 12

Question 13

Answer 13

Question 14

Answer 14

Question 15

The most commonly used parameter for measuring the ST segment is ___ ms post J point.

Answer 15

60 ms

Question 16

What are causes of ST segment elevation?

Answer 16

MI
Acute pericarditis
Benign early repolarization
Left vent. hypertrophy
BBB
Cardiomyopathy
Acute myocarditis
cardiomyopathy
aneurysm

Question 17

What are electrolyte causes for ST segment elevation?

Answer 17

hyperkalemia

hypercalcemia

Question 18

Hyperthermia causes ST segment elevation. True or false?

Answer 18

false

Hypothermia does.

Question 19

Acute abdominal disorder and CNS events can cause ST segment elevation. True or false?

Answer 19

true

Question 20

High frequency QRS detection of ischemia is known as ____ zone.

Answer 20

RAZ

reduced-amplitude zone