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.
When performing an EKG which limb is used as a ground.
The subclavicular 5th intercostal space on a 12-lead EKG typically corresponds to the V5 lead. This lead is positioned at the anterior axillary line at the same horizontal level as V4, which is located at the 5th intercostal space in the midclavicular line. V5 helps in assessing the lateral wall of the left ventricle and can provide information about conditions such as ischemia or infarction in that area.
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.
EKG machine leads are electrodes attached to the patient's skin to measure the electrical signals produced by the heart. The leads pick up these signals and transmit them to the EKG machine, which then displays them as a graph that represents the heart's electrical activity. Different lead placements provide different views of the heart's electrical activity.
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.