EKG Machines: On Ground and Precordial Leads
A CardioTech EKG Machine Brand Review


In our commitment of delivering you the best buys in EKG machines and other products through the EKGShop.com, we do not just sell, but also share information to keep you informed anything that is related to electrocardiography. And for this article, allow us to explain to you other types of leads or electrocardiogram, it refers as the signal that goes between two electrodes: the precordial leads and grounds.

Precordial leads

The electrodes for the precordial leads (V1, V2, V3, V4, V5, and V6,) are placed directly on the chest. Because of their close proximity to the heart, they do not require augmentation. Wilson's central terminal is used for the negative electrode, and these leads are considered to be unipolar (recall that Wilson's central terminal is the average of the four limb leads. This will approximate ground).The precordial leads view the heart's electrical activity in the so-called horizontal plane. The heart's electrical axis in the horizontal plane is referred to as the Z axis.

Leads V1, V2, and V3 are referred to as the right precordial leads and V4, V5, and V6 are referred to as the left precordial leads.

The QRS complex should be negative in lead V1 and positive in lead V6. The QRS complex should show a gradual transition from negative to positive between leads V2 and V4. The equiphasic lead is referred to as the transition lead. When the transition occurs earlier than lead V3, it is referred to as an early transition. When it occurs later than lead V3, it is referred to as a late transition. There should also be a gradual increase in the amplitude of the R wave between leads V1 and V4. This is known as R wave progression. Poor R wave progression is a nonspecific finding. It can be caused by conduction abnormalities, myocardial infarction, cardiomyopathy, and other pathological conditions.

Grounds

An additional electrode (usually green) is present in modern four-lead and twelve-lead ECGs. This is the ground lead and is placed on the right leg by convention, although in theory it can be placed anywhere on the body. With a three-lead ECG, when one dipole is viewed, the remaining lead becomes the ground lead by default.

To avoid erroneous results of any EKG Test, EKGShop.com recommends on using this trusted brand by most medical professionals: the CardioTech brand of EKG machines.

CardioTech GT-200 Light Interpretive EKG - This machine pays for itself after 55 tests. Internal memory for up to 40 records (Optional). Alphanumeric keyboard and big LCD for user friendly operation. ECG interpretation program for adult and pediatric ECG. 6-channel print-out in real-time at 5, 25 or 50 mm/s. Automatic print-out of 6/12 channels on one or two pages. Automatic and manual mode. Full size 8 1/2" x 11" reports (A4).

CardioTech GT-200 Light Interpretive EKG w/ Memory - This machine pays for itself after 80 tests. Internal memory for up to 40 records. Alphanumeric keyboard and big LCD for user friendly operation. ECG interpretation program for adult and pediatric ECG. 6-channel print-out in real-time at 5, 25 or 50 mm/s. Automatic print-out of 6/12 channels on one or two pages. Automatic and manual mode. Full size 8 1/2" x 11" reports (A4). Integrated rechargeable battery lasts up to 6 hours of normal use.        

CardioTech as the premier product of AdvanSource Biomaterials Corporation is a world-class polymer based materials company focused on customer-driven solutions for the medical device and pharmaceutical industries. Today’s devices are increasingly dependent upon material advancements and precise characteristics in order to optimize product performance.