(USMLE topics, cardiology) Understanding the standard 12-lead EKG – Basics of electrocardiography explained. This video is available for instant download licensing here: https://www.alilamedicalmedia.com/-/galleries/narrated-videos-by-topics/ekgecg/-/medias/4d57ce72-0d39-4525-b523-329941b9edcf-12-lead-ecg-explained-narrated-animation ©Alila Medical Media. All rights reserved. Voice by: Sue Stern. Support us on Patreon and get FREE downloads and other great rewards: patreon.com/AlilaMedicalMedia All images/videos by Alila Medical Media are for information purposes ONLY and are NOT intended to replace professional medical advice, diagnosis or treatment. Always seek the advice of a qualified healthcare provider with any questions you may have regarding a medical condition. Electrical activities of the heart can be picked up on the skin via electrodes. An ECG machine records these activities and displays them graphically. The graphs show the heart’s OVERALL electrical potential, or voltage, as it changes over time during a cardiac cycle. The 12 leads of the ECG represent 12 electrical views of the heart from 12 different angles. The conventional 12-lead procedure involves attaching 10 electrodes to the body: one to each limb and six across the chest. There are 6 limb leads and 6 chest leads. The 6 limb leads look at the heart in a vertical plane and are obtained from three electrodes attached to the right arm, left arm, and left leg. The electrode on the right leg is an earth electrode. The measurement of a voltage requires 2 poles: negative and positive. The ECG machine uses the negative pole as zero reference. Thus, the position of the positive pole is the “point of view”, and the line connecting the 2 poles is the “line of sight”. Leads I, II, and III are BI-polar – they measure electrical potential between 2 of the 3 limb electrodes: Lead I represents the voltage between the right arm – negative pole – and the left arm – positive pole, and thus looks at the heart from the left. Lead II sees signal movements between the right arm – negative – and the left leg –positive – forming the INFERIOR LEFT view. Similarly, lead III measures electrical potential between the left arm – negative – and the left leg –positive, looking at the heart from an INFERIOR RIGHT angle. Leads aVR, aVL, and aVF, or “augmented limb leads”, are UNIpolar. They use ONE limb electrode as the positive pole, and take the average of inputs from the OTHER two as the zero reference. Hence, aVR looks at the UPPER RIGHT side of the heart; aVL looks at the UPPER LEFT side of the heart; and aVF looks at the INFERIOR wall of the heart. The chest leads, or precordial leads, view the heart in a HORIZONTAL plane. These are unipolar leads. The corresponding chest electrodes serve as the positive poles. The reference negative value is the same for all chest leads and is calculated as the average of inputs from the three limb electrodes. DE-polarization TOWARD a lead produces a POSITIVE deflection; DE-polarization AWAY from a lead gives a NEGATIVE deflection. The REVERSE is true for RE-polarization. Thus, leads that look at the heart from different angles may have waves pointing in different directions.

12 Lead ECG Explained, Animation
- Post author:
- Post published:June 5, 2021
- Post category:Uncategorized
- Post comments:0 Comments
You Might Also Like

Geriatric Physiotherapy Video – 5

Is a New Treatment for Diabetes Near?

Flat Bench Fly-5

Resistance – Low Pulley Bicep Curls

Intermittent Fasting & Fasting Video – 2

Pharm Drug Excretion

Biotin For Faster Hair Growth And Hair Loss Prevention

What Is BMI? How Is BMI Calculated?

Six pack abs: Side plank with crossed legs

Testosterone & Androgenic Effects Video – 37

BioDomino: The human digestive system in 6,300 dominoes

Donkey Kicks-10

How To: Deadlift

12 Foods For Anemia – Best Foods For Anemia

Why You Should Take Folic Acid BEFORE Pregnancy

Leg Curl-2

Nutrition : How to Avoid Bad Foods After a Heart Attack

One Hand Triceps Extension-6

fast metabolism diet-fat burning diet-fat burning foods-fat loss diet-metabolism boosting foods

Muscular Strength Asanas Video – 6

(CC) How to Pronounce atenolol (Tenormin) Backbuilding Pharmacology

What is TB? | Infectious diseases | NCLEX-RN | Khan Academy

Otorhinolaryngology Video – 2

L-Glutamine for Leaky Gut Syndrome, IBS and Gut Health!

Athletics Video – 2

Diabetes Education: Dietician

Sugar Free, Low Sugar Video – 29

Ginger Tea ☕ To Lose Belly Fat in a Natural way !!!

Diazepam Nursing Considerations, Side Effects, and Mechanism of Action Pharmacology for Nurses

What is STEROID SULFATASE? What does STEROID SULFATASE mean? STEROID SULFATASE meaning & explanation

Telasana Core Strengthening Exercise | Yoga

Standing Calf Raises

What is Finasteride and Minoxidil? – Hair Loss for Women

Upright Row-3

Detection of Albumin in Urine – MeitY OLabs

One Arm Row Dumbbell-4

Antihypertensives: volume decreasing: ACE & Diuretics (VOLUME ONLY)

HOW TO MAKE PROTEIN POWDER AT HOME FOR BODYBUILDING | AMIT PANGHAL | PANGHAL FITNESS

Top 8 Plant Based Protein Sources

Intermittent Fasting & Fasting Video – 7

Hormonal Control of the Menstrual Cycle, Animation.
