Electrocardiogram Diagram. Color coding standards for the 12 lead ecg. Chest precordial electrodes and placement v1 fourth intercostal space on the right sternum v2 fourth intercostal space at the left sternum v3 midway between placement of v2 and v4 v4 fifth intercostal space at the midclavicular line.
Typical ecg findings in mobitz type 2 av block include a consistent pr interval duration with intermittently dropped qrs complexes due to a failure of conduction. Sensors attached to the skin are used to detect the electrical signals produced by your heart each time it beats. On the horizontal axis each small square is equal to 1 mm004 second and each large square 5 mm020 second on.
A 5 lead ecg uses 4 limb leads and 1 chest lead.
A 12 lead ecg records 12 leads producing 12 separate graphs on a piece of ecg paper. The heart rate should also be displaying 60 beats per minute bpm. An ecg lead is a graphical representation of the hearts electrical activity which is calculated by analysing data from several ecg electrodes. By comparison a heart monitor requires only three electrode leads one each on the right arm left arm and left chest.