We are Revolutionizing Medical Education through hand-drawn illustrations. They say a picture is worth a thousand words, we have integrated that philosophy in our every lecture. Our videos are interactive and fun to watch so you don’t have to spend hours memorizing. We use hand-drawn illustrations to empower your learning process because we believe lasting knowledge results from clear concepts. We have 700+ videos on Anatomy, Neuroanatomy, Embryology, Histology, Physiology, Biochemistry, Genetics, Pharmacology, Microbiology, Immunology, Pathology and Clinical Medicine all recorded by Dr. Our videos are being watched by millions of Medical, Dentistry, Nursing and Pharmacy students in over 100 countries. Najeeb Lectures are the World’s Most Popular Medical Lectures. Master Medical Sciences with crystal clear concepts.ĭr. Students from Top Schools are watching our videos! Not a member? Sign up now to access 700+ videos on Basic Medical Sciences & Clinical Medicine. Orientation of ECG Leads – Chest leads The ECG Leads – Chest leads (V1, V2, V3, V4, V5, V6) axis are oriented relative to each other along the horizontal plane almost approximately 30 degrees). V5 and V6 oriented anatomically over the left side of the heart.įunctional classification of chest leads This classification is based on electrical activity from various parts of the ventricles, V1 and V2:- Septal leads V3 and V4:- Anterior leads V5 and V6:- Left leads / Left lateral leads V1, V2, V3 and V4:- Antero-septal leads V3, V4, V5 and V6:- Anterolateral leads (Anteroapical leads) V2, V3, V4 and V5:- Large anterior leads (Main Anterior leads) V3 and V4 oriented anatomically over the septum. V4:- Placed in the mid-clavicular line in the fifth inter coastal space V5:- Placed in the anterior Axillary line at the same level as lead V4 V6:- Placed in the mid axillary line at the same level as lead V4 For placement of chest leads always follow bonny land marks, never use the nipples to locate the position of any of the chest leads because nipple’s position may vary person to person.Ĭlassification of the ECG Leads – Chest leads There are two ways to classify the ECG Leads – Chest leadsĪnatomical classification of chest leads V1 and V2 oriented anatomically to the right side of the heart. V2:- Placed in the fourth inter coastal space just to the left of the sternum. For all of these, Wilson common terminal will remain same and only the position of exploring electrode will be changed V1:- Placed in the fourth inter coastal space just to the right of the sternum. Placement of the ECG Leads – chest leads There are six standard and three additional chest leads here we will discuss only six standard chest leads.
Exploring electrode connected with positive terminal of the machine is applied on the surface of the chest wall In this case whatever the electrical activity of the heart transmitted along horizontal plane, the exploring electrode will be able to detect the voltages in relation to the indifferent electrode. Making ECG Leads – Chest leads To make an ECG Leads – chest lead, negative terminal of the machine is connected via common wire to the negative electrode at left arm, right arm and left leg with high resistance. Chest lead basically determines electrical activity of the heart transmitted along the horizontal plane (Transverse/Antero –posterior plane) Vi = Ei – Ie Vi : – Voltage detected by Chest lead Ei :- Potential determined by exploring electrode Ie :- Potential determined by indifferent electrode All the chest leads determine potential differences between exploring electrode and virtual electrode (indifferent electrode), as we know indifferent electrode has almost zero voltage, so potential difference detected by the chest lead is practically equal to voltage detected by exploring electrode. ECG Leads – Precordial Leads ECG Leads – Chest Leads: It is a Unipolar lead having two electrodes, one is positive or exploring electrode applied on the surface of the chest wall and other is indifferent electrode constructed by Wilson central terminal.
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