What is meant by depolarization?

What is meant by depolarization?

movement of a cell’s membrane potential to a more positive value (i.e. movement closer to zero from resting membrane potential). When a neuron is depolarized, it is more likely to fire an action potential.

What is positive ECG?

Positive. A positive test result occurs where a diagnosis of coronary artery disease (IHD, angina) is definite. Inconclusive. An inconclusive test result is usually due to non-diagnostic ECG changes, or when the test is terminated early due to exhaustion, beforemaximum heart rate or workload is reached.

What happens if your stress test is abnormal?

An abnormal result, which means your heart’s blood flow is insufficient, may occur only during the exercise phase of your stress test. During rest, your blood flow may be normal, but during strenuous activity, when your heart is working harder, it may not be getting the blood supply it needs.

Can anxiety cause abnormal EKG?

Premature ventricular contractions is one of the manifestations of sympathetic over activity due to anxiety. However, anxiety might induce electrocardiographic (ECG) changes in normal person with normal heart, as in this documented case.

Can ECG give false readings?

The electrical measurements on the electrocardiogram can often mislead physicians in diagnosing the heart condition left ventricular hypertrophy, causing other screening tests to be ordered before a definitive conclusion can be made, according to a Henry Ford Hospital study.

How accurate is ECG?

The ECG is by far not as accurate as many patients and doctors would like to believe. Often, the findings of a measurement are completely normal even though a heart attack has taken place. As a result, ECG does not detect two out of every three heart attacks at all or not until it is almost too late.

What is a good ECG reading?

Normal range 120 – 200 ms (3 – 5 small squares on ECG paper). QRS duration (measured from first deflection of QRS complex to end of QRS complex at isoelectric line). Normal range up to 120 ms (3 small squares on ECG paper).

What causes abnormal sinus rhythm?

These include: Coronary artery disease, other heart problems and previous heart surgery. Narrowed heart arteries, a heart attack, abnormal heart valves, prior heart surgery, heart failure, cardiomyopathy and other heart damage are risk factors for almost any kind of arrhythmia.

What is a sinus rhythm on an EKG?

Sinus rhythm (a.k.a. normal sinus rhythm) refers to the normal heart beat originating from the sinoatrial node. This is manifested as an upright P wave in lead II of the ECG.

What does a borderline ECG mean?

“Borderline” generally means that findings on a given test are in a range that, while not precisely normal, are not significantly abnormal either.