What is isometric line ECG?

This is represented as a straight line on the ECG paper where there is no positive or negative charges of electricity to create deflections. Waveforms. These are representations of electrical activity created by depolarization and repolarization of the atria and ventricles.

How do you find the isoelectric line on an ECG?

Find the isoelectric line (baseline) of the cardiac cycle by looking at the T-P segment. (Some references suggest finding the isoelectric line by looking at the PR segment.2) Measure the height (amplitude) of the ST segment from the isoelectric line at the J point in mm (each small box is 1 mm) (see J point elevation).

What does a straight line on an ECG mean?

That means you don’t have a heartbeat. It’s also known as flatline. That’s because doctors check the rhythm of your heart with a machine called an electrocardiogram — also called an ECG or EKG. It shows a straight line when there’s no heartbeat. Asystole happens to everyone when they die.

What is negative deflection in ECG?

A wave of depolarization traveling away from a positive electrode results in a negative deflection. A wave of repolarization traveling toward a positive electrode results in a negative deflection. A wave of repolarization traveling away from a positive electrode results in a positive deflection.

What is polarization of the heart?

Heart muscle cells are polarized when at rest. This means that the net charge density of the fluid inside and outside of the cells is different, because ion concentrations are different on either side of the cell membranes.

Why is ST segment isoelectric?

The ST segment is the isoelectric line because there is no voltage difference across cardiac muscle cell membrane during this state. Any distortion in the shape, duration, or height of the cardiac action potential can distort the ST segment.

Which components of the ECG are measured along the isoelectric line?

Components of the ECG The electrical events of the heart (ECG) are usually recorded as a pattern of a baseline (isoelectric line), broken by a P wave, a QRS complex, and a T wave. In addition to the wave components of the ECG, there are intervals and segments (Fig. 5.2).

What are the 3 lines on an EKG?

There are three main components to an ECG: the P wave, which represents depolarization of the atria; the QRS complex, which represents depolarization of the ventricles; and the T wave, which represents repolarization of the ventricles.

Is asystole the same as flatline?

Asystole, colloquially referred to as flatline, represents the cessation of electrical and mechanical activity of the heart. Asystole typically occurs as a deterioration of the initial non-perfusing ventricular rhythms: ventricular fibrillation (V-fib) or pulseless ventricular tachycardia (V-tach).

What is downward deflection?

A negative (downward) deflection appears in any lead if the wave of depolarization spreads toward the negative pole of that lead (or away from the positive pole).

Why QRS complex is a downward deflection?

Solution : QRS complex is caused due to ventricular depolarization resulting in ventricular contraction, and hence it is a dowward deflection.