ECG General description with Basic idea of 12 Leads with Positions On Body

Introduction of ECG a Basic Idea about ECG with general description of 12 Leads

ECG introduction and other details  6

Introduction of ECG a Basic Idea about ECG with general description of 12 Leads ,ECG WAVE

 

Connect leads:

  • . RA (Red) to right arm
  • • RL (Black) to right leg
  • · LA (Yellow) to left arm
  • · LL (Green) to left leg

ECG introduction and other details 11

Introduction of ECG a Basic Idea about ECG with general description of 12 Leads limb leads

 

Connect the precordial leads Vi – V 6 as follows:

  • · Vi to the right of sternum in the 4th intercostal space
  • · V2 to the left of the sternum in the 4th intercostal space
  • · V3 midway between V2 and V4
  • · V4 midclavicular line left fifth intercostal space
  • · Vs and V6 in the same line as V4 in anterior and mid axillary lines respectively.

ECG introduction and other details 8

Introduction of ECG a Basic Idea about ECG with general description of 12 Leads chest leads

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ECG introduction and other details 4

Introduction of ECG a Basic Idea about ECG with general description of 12 Leads ,bipolar leads

The 12 leads are:

  • – 3 standard limb leads L I, L II, L III
  • – 3 augmented leads AVR, AVL, AVF
  • – 6 precordial leads V1 to V6

Normal ECG consists of 12 leads recorded serially or simultaneously or in groups. In the above picture, 3 leads have been recorded at a time

ECG introduction and other details 33

normal ecg

• Look at the waves and intervals in the ECG.

  • The first wave is the P wave.
  • The next tall and narrow wave and often consistin RS wave followin which is the T
  • From the beginning of P wave to beginning of QRS is the PR interval.
  • · From the beginning of Q to the end of T is the QT interval.
  • · From beginning of QRS to the end of QRS is the QRS interval.
  • · From the end of R to the beginning of T is the ST segment.

ECG introduction and other details 1

Introduction of ECG a Basic Idea about ECG measurment

  • 1 mm = 0.04 see
  • 5 mm = 0.2 see
  • 1 mm = 0.1 mv

On the ECG paper, time is represented in seconds horizontally and voltage is represented in millivolts vertically.

  • · 1 small square is 0.04 s horizontally and 0.1 mv vertically, if the paper speed is 25 mm/s.
  • · This means that 10 mm = 1 mv.
  • · 5 small squares = 5 x 0.04 = 0.2 s.
  • · 1 big square = 0.2 s, 5 big squares = 0.2 x 5 = 1 sec.
  • This is a Basic idea about ECG, with a introduction to measuring ECG .
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