Unit 1. Lec 5- Cardiac Electrophysiology

Question 1

The heart is an electrically-driven 2 cycle pump? What are the phases?

Answer 1

• Filling phase
• Ejection phase

Question 2

List the Average Resting Heart Rates:

Low yield

Answer 2

• Healthy aldult- 70 beats per minute
• Athlete-50 bpm
• Newborn-135 bpm
  (just before birth)- 160 bpm
• Elderly-80 bpm

Question 3

What is the dynamic range of heart rate and why is it not effective?

Answer 3

20-250 bpm, not efffictive b/c it doesnt allow enough blood or time for refill

Question 4

What is the “intrinsic” heart rate?

Intrinsic-no autonomic neural output

Answer 4

100 bpm

Question 5

What is the maximum “effective” heart rate?

i.e.-during excercise

Answer 5

180 bpm

Question 6

What is a sign of Tachycardia?

Answer 6

> 100 bpm

Question 7

What is a sign of Bradycardia?

Answer 7

<60 bpm

Question 8

How is the electrical activity of the heart measured in clinical environments?

Answer 8

Electrocardiogram (ECG)

Question 9

What does the ECG record? and explain how?

Answer 9

• Records electroactivity of the heart in real time and can show abnormalites in cardiac output
• The use 12 leads on different areas of the heart to measure different waveforms