ECG is one of the oldest methodologies to diagnose several heart attaching them to the arms, legs and chest puting the heart always at the center. Doing so we measure the electrical activity and can put several diagnosis like MI, angina, myocarditis which is inflamation of the heart muscle, pulmonary embolus, arrhythmias originating from different chambers and foci pericardial effusions diseases like infiltrations of the pericardium and myocardium. But the ECG’s sensitivity and specificity is not so good, meaning we can be deceived easily by a middle aged woman because 50% of women have false positive results while they have clean coronaries, but the ECG shows diseased arteries. There are a lot of other reasons changing the ECG like medicines, electrolytes, hormones etc.

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