Explain me basic of ecg ,number of leads, their placement adject. When

Explain me basic of ecg ,number of leads, their placement adject. When I get an ecg strip from where I should start reading how to read what is Significance of speed of ecg and those small boxes and and every minor details . What is the role of those 12 ecg leads what is theirs Significance of each one . Why some leads give ecg diagram in opposite direction which leads should be ready first and why .which read second third and so on . How to observe their changes . Explain me everything with image . In image it should be pointed which part your are actually explaining .also explain cardiac axis concept and tachycardia and bradycardia in ecg strip . Searched 1 source

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Explain me basic of ecg ,number of leads, their placement adject. When I get an ecg strip from where I should start reading how to read what is Significance of speed of ecg and those small boxes and and every minor details . What is the role of those 12 ecg leads what is theirs Significance of each one . Why some leads give ecg diagram in opposite direction which leads should be ready first and why .which read second third and so on . How to observe their changes . Explain me everything with image . In image it should be pointed which part your are actually explaining .also explain cardiac axis concept and tachycardia and bradycardia in ecg strip . Searched 1 source

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