MEDICAL
HEART AND PERICARDIUM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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unipolar
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bipolar
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tripolar
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None of the above
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Detailed explanation-1: -Well, the 2 leads situated on the right and left wrist (or shoulders), AVr and AVL respectively, and the lead situated on the left ankle (or left lower abdomen) AVf, make up a triangle, known as “Einthoven’s Triangle". Information gathered between these leads is known as “bipolar".
Detailed explanation-2: -For a routine analysis of the heart’s electrical activity an ECG recorded from 12 separate leads is used. A 12-lead ECG consists of three bipolar limb leads (I, II, and III), the unipolar limb leads (AVR, AVL, and AVF), and six unipolar chest leads, also called precordial or V leads, (, , , , , and ).
Detailed explanation-3: -Leads I, II and III are Einthoven’s original leads, and they can be presented with Einthoven’s triangle (lower panel). Leads aVR, aVL and aVF were constructed by Goldberger; their reference point is the average of two electrodes.