You are preparing to conduct a 12-lead ECG on a patient. As you are gathering your supplies, you notice that five of the electrodes are made by one company and the other five electrodes are made by another company. What is your next step?

The part of the ECG tracing below that is circled in blue is the: 

Which rib is located next to the angle of Louis?

Which dysrhythmia occurs when the SA node stops firing, causing a pause in electrical activity?

Which rhythm shows an irregularity during inspiration and expiration?

You are performing a 12-lead ECG on a hospital patient using a portable ECG machine on a cart. As you are conducting the ECG, a red line appears at the bottom of the ECG graph paper. What should you do?

Which method of calculating the heart rate is shown below? 

On an ECG tracing, the period of time from the start of ventricular depolarization to the end of ventricular repolarization is the:

Depolarization of the cells causes the heart muscle to:

The most commonly used paper speed on the ECG machine is: