What are the principles of electrocardiography?
The basic principle of the ECG is that stimulation of a muscle alters the electrical potential of the muscle fibres. Cardiac cells, unlike other cells, have a property known as automaticity, which is the capacity to spontaneously initiate impulses.
What type of electrodes are used in ECG?
Two types of electrodes in common use are a flat paper-thin sticker and a self-adhesive circular pad. The former are typically used in a single ECG recording while the latter are for continuous recordings as they stick longer.
What is a 5 lead ECG?
An electrocardiogram (ECG) is a non-invasive method of monitoring the electrophysiology of the heart. Electrodes are placed on the patient’s torso, and the electrical activity of the heart is measured from several leads (voltage difference between electrodes). 5-lead monitoring uses five electrodes.
What is the difference between electrocardiogram and electrocardiograph?
ECG and EKG are different abbreviations for the same test, called an electrocardiogram. An electrocardiogram is a test to measure how the electricity in a person’s heart is functioning. People may also refer to an electrocardiogram as an electrocardiograph.
What are the 8 steps needed to analyze an EKG?
Terms in this set (8)
- evaluate the P wave. -is it present.
- Evaluate atrial rhythm. -regular.
- Determine the atrial rate.
- PR interval.
- evaluate the ventricular rhythm.
- determine the ventricular rate.
- calculate the duration of the QRS complex.
- calculate the duration of the QT interval.
Why is it called 12 leads ECG?
The 12-lead ECG displays, as the name implies, 12 leads which are derived by means of 10 electrodes. Three of these leads are easy to understand, since they are simply the result of comparing electrical potentials recorded by two electrodes; one electrode is exploring, while the other is a reference electrode.
What is meant by electrocardiograph?
A line graph that shows changes in the electrical activity of the heart over time. It is made by an instrument called an electrocardiograph.
What is the difference between echocardiography and electrocardiography?
an echocardiogram. Although they both monitor the heart, EKGs and echocardiograms are two different tests. An EKG looks for abnormalities in the heart’s electrical impulses using electrodes. An echocardiogram looks for irregularities in the heart’s structure using an ultrasound.
What is AVr AVL and AVf in ECG?
aVR means augmented Vector Right; the positive electrode is on the right shoulder. aVL means augmented Vector Left; the positive electrode is on the left shoulder. aVF means augmented Vector Foot; the positive electrode is on the foot.
What does AVr stand for in ECG?
Unipolar Leads
| Label | Meaning of label | Position of lead on body |
|---|---|---|
| AVr | Augmented vector right | Right wrist |
| AVL | Augmented vector left | Left wrist |
| AVf | Augmented vector foot | Left foot |