When performing an EKG which limb is used as a ground.
VII
Modified Chest Lead - 1 (V1 position)
yes
There are only 10 electrodes and leads, but those 10 leads get 12 different electrical recordings, which makes it a 12-lead ekg.
A twelve lead electrocardiogram (EKG or ECG) shows a representation of the electrical activity of the heart as measured from 12 different perspectives (leads). The interpretation of EKGs allows a physician to determine if there are potential abnormalities or injury to the heart, at the time the EKG is taken.
ECG and EKG mean the same thing, and it records the hearts electrical activity on a 6 second strip. The physician can make a diagnosis by looking at the EKG print out. If a 12-Lead EKG is used, then all walls and function of the heart will be recorded.
12, one for each lead.
vi
An EKG tells us about how electricity flows through the cells of the heart. Any infarction of cardiac tissue causes changes in the way the electricity travels. An EKG can show us these changes and help us to even identify where the infarction is occurring. A 12 lead EKG must be done to truly identify any infarction. The 12 lead shows us 12 different views of the electricity as it moves from one lead to another. By comparing the views we get against what would normally be expected and comparing each lead to the others we can look for changes in the EKG pattern (ST elevation or depression is the most obvious, but many other changes exist).
by largest, I'll assume tallest. the tallest wave on an EKG is called the QRS complex and represents the contraction of the left ventricle. btw tallest could also mean lowest depending on the particular ekg lead.
please display a diagram of lead placement
In an electrocardiogram (EKG or ECG), the right leg is often designated as the ground electrode to minimize electrical interference and provide a stable reference point for the measurements. Grounding helps to reduce noise from external electrical sources and ensures that the heart's electrical activity is accurately captured by the other electrodes. This setup enhances the clarity of the EKG trace and contributes to consistent and reliable results.