10. Cardiac pacing

Question 1

What are methods of pacing?

Answer 1

Non-invasive:
1. Percussion pacing
2. Transcutaneous pacing

Invasive:
1. Temporary transvenous pacing
2. Permanent pacing

Question 2

What is demand mode in a cardiac pacing device and what are its limitations?

Answer 2

• Demand mode is whereby pacemaker is inhibited if a natural QRS complex occurs
• Movement artefacts may be misinterpreted as QRS complex and inhibit pacing

Question 3

What is normal pacing rate?

Answer 3

60-90/min

Question 4

At what currents does electrical capture usually occur in transcutaneous pacing?

Answer 4

50 - 100mA

Question 5

Can CPR occur in patients undergoing transcutaneous pacing?

Answer 5

Yes, though there is no benefit to pacing during CPR so the device should be turned off