The locations for the ECG electrodes on the chest are
V1: 4th intercostal space (ICS), RIGHT margin of the sternum
V2: 4th ICS along the LEFT margin of the sternum
V4: 5th ICS, mid-clavicular line
V3: midway between V2 and V4
V5: 5th ICS, anterior axillary line (same level as V4)
V6: 5th ICS, mid-axillary line (same level as V4)
One of the easiest and quickest tests to assess the heart is an electrocardiogram (ECG). On the arms, legs, and certain locations on the chest, electrodes are positioned. Lead wires are used to connect the electrodes to an ECG device. The heart's electrical activity is then recorded, deciphered, and printed out. In order to maintain proper blood flow, the heart's many muscle contractions are coordinated by natural electrical impulses. These electrical impulses are captured by an ECG to display the heart's rate, rhythm, and strength and timing as they pass through the various heart chambers. Numerous heart-related disorders might show up as changes in an ECG.
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