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2. Electrocardiography - Wikipedia

   en.wikipedia.org/wiki/Electrocardiography

   The 12-lead ECG has a total of three limb leads and three augmented limb leads arranged like spokes of a wheel in the coronal plane (vertical), and six precordial leads or chest leads that lie on the perpendicular transverse plane (horizontal). [33] Leads should be placed in standard positions.

3. Lewis lead - Wikipedia

   en.wikipedia.org/wiki/Lewis_lead

   A Lewis Lead (also called the S5 lead) is a modified ECG lead used to detect atrial flutter waves when atrial flutter is suspected clinically, based on signs and symptoms, but is not definitely demonstrated on the standard 12 lead ECG. In order to create the Lewis Lead, the right arm electrode is moved to the manubrium adjacent to the sternum ...

4. Axillary lines - Wikipedia

   en.wikipedia.org/wiki/Axillary_lines

   The V 5 ECG lead is placed on the anterior axillary line, horizontally even with V 4. The midaxillary line is a coronal line on the torso between the anterior and posterior axillary lines. It is a landmark used in thoracentesis, [2] and the V6 electrode of the 10 electrode ECG.

5. Hexaxial reference system - Wikipedia

   en.wikipedia.org/wiki/Hexaxial_reference_system

   The hexaxial reference system is a diagram that is used to determine the heart's electrical axis in the frontal plane. The hexaxial reference system, better known as the Cabrera system, is a convention to present the extremity leads of the 12 lead electrocardiogram, [1] that provides an illustrative logical sequence that helps interpretation of the ECG, especially to determine the heart's ...

6. Einthoven's triangle - Wikipedia

   en.wikipedia.org/wiki/Einthoven's_triangle

   If the arm electrodes are reversed, lead I changes polarity, causing lead II and lead III to switch. If the right arm electrode is reversed with the leg's electrode, lead II changes polarity, causing lead I to become lead III, and vice versa. Reversal of the left arm and leg causes a change in polarity of lead III and switching of leads I and ...

7. Right axis deviation - Wikipedia

   en.wikipedia.org/wiki/Right_axis_deviation

   If lead b is positive, the electrical heart axis can be estimated to lie within the quadrant between axis of lead a and lead b. A simple tool to quickly identify axis deviation (Figure 3) is the popular mnemonic; R eaching for R ight Axis Deviation and L eaving for L eft Axis Deviation.

8. Electrocardiography in myocardial infarction - Wikipedia

   en.wikipedia.org/wiki/Electrocardiography_in...

   The 2018 European Society of Cardiology/American College of Cardiology Foundation/American Heart Association/World Health Federation Universal Definition of Myocardial Infarction for the ECG diagnosis of the ST segment elevation type of acute myocardial infarction require new ST elevation at J point of at least 1mm (0.1 mV) in two contiguous leads with the cut-points: ≥1 mm in all leads ...

9. Dextrocardia - Wikipedia

   en.wikipedia.org/wiki/Dextrocardia

   ECG leads must be placed in reversed positions on a person with dextrocardia. In addition, when defibrillating someone with dextrocardia, the pads should be placed in reverse positions. [ 8 ] That is, instead of upper right and lower left, pads should be placed upper left and lower right.