Key Learning Points
ECG: Paper, Calipers, Rulers, Rate Calculation
ECG Time Page 2
- The ECG small square is 0.04 seconds wide(a).
- Large squares contain 5 small squares and are 0.20 seconds wide(b).
- ECG recording strips contain 3 second timing markers(c).
- ECG time can be described using seconds or milliseconds.
- 0.04 seconds equals 40 milliseconds, 0.20 seconds equals 200 milliseconds.
ECG VoltagePage 3
- Each small square represents 0.1 millivolt(a) of muscle depolarization sensed by the skin electrodes.
- The ECG height(b) is a reflection of the amount of ventricular depolarization received from the skin electrodes.
- The isoelectric line(c) represents and area with no cardiac electrical activity and lies between the P and T waves.
