Select the best response from the answer choices following each question.
2. When an impulse generated from the heart moves away from the ECG lead, what effect does this have on the ECG tracing?
3. The R-R interval in a standard ECG spans 15 small squares. What is the heart rate of this patient?
4. Which element of the ECG tracing represents ventricular depolarization?
5. When measuring the electrocardiogram, one small square represents 40 milliseconds. Given this information, the speed of the electrocardiogram when it records impulses is: