COI

Question 1

When evaluating the current of injury (COI), what should you do if the signal is over amplified/cropped and why?

Answer 1

• hit the gain/resize button because you will not be able to identify tru R-Waves and differentiate them from the COI
• analyzer measures peak-peak and doesn’t differentiate R-wave from COI

Question 2

What does the COI look like on an ECG?

Answer 2

localized ST elevation

Question 3

What is the recommended action if unable to see any R-waves due to a large COI?

Answer 3

advise the surgeon to wait 5 mins as the COI will have reduced by 50% by that time

Question 4

How long does it take for 50% of the COI to diminish?

Answer 4

about 5 min

Question 5

How long does it take for the COI to recede completely?

Answer 5

about 10 - 15 min

Question 6

What are the 2 methods for measuring R-waves at implant?

Answer 6

• print paper at 50 mm/sec

- use single R-wave/frozen assessment (COI button)