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Welcome to "ECG: the first step "!!
It is a pleasure to study with you.
The purpose of "ECG: the first step" is to be able to diagnose which ECG is normal, which is of a patient with left ventricular hypertrophy, and which is of a patient with inferior myocardial infarction among this, this, and this. It would be easy if this was all we had to study. When the positive R wave of the lead I is tall like this, it is of a patient with left ventricular hypertrophy. And when the negative Q wave of the aVF lead is deep like this, it is of a patient with inferior myocardial infarction. If none of these two are found, the ECG is normal (among the three candidates).
If you merely want to recognize patterns, please remember the above and skip the "ECG: the first step". If you want to achieve the ability to diagnose with the understanding of the principles of ECG and the pathophysiology, please spend about an hour with us.
First of all, let's take a look at a video image when an ECG is actually recorded. In a standard recording of ECG, ECG is recorded like this 12 times. Each record is of a different "lead".
This is the recorded lead I ECG. The other 11 leads are recorded in a similar way. The ECG recording, presented to us in clinical situations, is the summary of all 12 leads as in this normal ECG . It has a vast amount of information. What is the ECG telling us? Roll up your sleeves and let's get to work!