What is Mason Likar?

The Mason–Likar modified electrocardiogram (ML-ECG) can be interchanged with standard 12 lead ECG electrode positions (standard ECG) without affecting the diagnostic interpretation during sinus rhythm, but the morphological differences during ventricular arrhythmias have not been sufficiently evaluated.

What is Mason Likar lead placement?

The Mason-Likar (M-L) ECG lead adaptation for stress testing relocated the wrist electrodes to the medial border of deltoid, 2 cm below the lower border of the clavicle in the right and left infra-clavicular fossae, and the left leg electrode to the anterior axillary line midway between the iliac crest and the costal …

How many leads are used for bedside monitoring?

If two leads are available, V1 and lead III or aVF (or a limb lead with maximal ST segment displacement) are good choices. If three leads are available, leads V1, III, and aVF are the best choices. Continuous 12-lead monitoring is available and offers several advantages.

What is MCL lead ECG?

MCL 1 or Modified V1. Another popular monitoring lead is the MCL1 lead (or modified V1). To connect this lead, the negative electrode is placed near the left shoulder, usually under the outer third of the left clavicle, and the positive electrode is placed to the right of the sternum in the fourth intercostal space.

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.

Why it is called 12-lead ECG?

The standard ECG – which is referred to as a 12-lead ECG since it includes 12 leads – is obtained using 10 electrodes. These 12 leads consists of two sets of ECG leads: limb leads and chest leads. The chest leads may also be referred to as precordial leads.

What is a Mason-Likar lead system?

Mason-Likar’s lead system simply implies that the limb electrodes have been relocated to the trunk. This is used in all types of ECG monitoring (arrhythmias, ischemia etc).

What is the advantage of Mason-Likar system over Lund system?

The advantage is that movement artefacts are reduced as in Mason-Likar system while changes in the 12 lead ECG pattern are lesser and more comparable to standard 12 lead ECG. Hence Lund system can be used both for diagnostic ECG and monitoring [6].

What is the difference between Mason Likar and Lund lead ECG?

While the limb electrodes are transposed to the torso in Mason-Likar modification, they are placed on the proximal regions of the limbs in the Lund lead system [5]. The advantage is that movement artefacts are reduced as in Mason-Likar system while changes in the 12 lead ECG pattern are lesser and more comparable to standard 12 lead ECG.

Where are the precordial leads located in Mason-Likar modification?

The precordial leads are located in the Mason-Likar modification in the standard places of the 12-lead system. In ambulatory monitoring of the ECG, as in the Holter recording, the electrodes are also placed on the surface of the thorax instead of the extremities.