Lead I: 0 and +/- 180
Lead aVL: -30 and +150
Lead III: -60 and +120
Lead aVF: -90 and +90
Lead II: -120 and +60
Lead aVR: -150 and +30
A 3-lead ECG records electrical activity from three points on the body, while a 12-lead ECG records from 12 points. The 12-lead ECG provides a more comprehensive view of the heart's electrical activity, allowing for better detection of abnormalities. This increased number of leads improves the accuracy of cardiac monitoring by providing more detailed information about the heart's function and potential issues.
Interpreting a 12-lead ECG involves analyzing the electrical activity of the heart from different angles. Each lead provides information on a specific area of the heart, helping to identify abnormalities such as arrhythmias, ischemia, or infarction. By examining the waveforms, intervals, and segments in each lead, healthcare professionals can diagnose and monitor various heart conditions.
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LEAD DISPLACEMENT
ST elevation
The wave direction indicated whether the electrical impulse from the heart is going towards or away from the ECG lead that is being studied.
The T wave is positive in an ECG due to the direction and charge. This positive deflection occurs after each QRS complex.
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Adrenaline increases heart rate and conduction velocity in the heart, which can lead to changes in the ECG. These changes may include a shortening of the PR interval, widening of the QRS complex, and an increase in heart rate.
The amplitude of an ECG wave is typically measured in millimeters (mm) on the vertical axis of the ECG graph. It represents the voltage or electrical activity of the heart muscle during each phase of the cardiac cycle.
These leads help healthcare professionals to find any heart rhythm issues as they are occurring. It is important to place this lead correctly on a limb.