ECG: Heart Axis

Posted by Nyoman Ririn Chandrika on Monday, February 15, 2016
Hello, everyone! Back with us again, the imedical-apps team. Now we're going to give you sneak a peak about our new application ECG: Heart Axis

The idea of making this new application popped up when we're trying to interpret a series of ECG recording, and find it complicated to get the exact heart axis by calculating the vector manually. Heart axis or cardiac axis is the direction of action potentials during ventricular depolarizations. Knowing heart axis is important, as some abnormalities of the heart structure could make the heart deviates from its normal axis. 

Actually, we could get the gross heart axis just by determining the resultant deflection of the QRS complex in lead I and AVF. For example, if the QRS complex has a positive deflection in both lead I and AVF, we can conclude that the heart axis is normal (lies between 0 to 90 degree). But what if one of the QRS complex, either in lead I or AVF, has a negative deflection? Is that always counts for an abnormal heart axis? Think again. Normal heart axis lies between -30 degree to 120 degree. So if the negative deflection of QRS complex happened only in lead I, one still has the probability of having normal heart axis (as it still has a probability of having lies between 90 degree to 120 degree). 

Then, how could we differentiate that? Simply tap on this link or click the badge below.

Get it on Google Play

ECG: Heart Axis  is a simple application to determine heart axis from a simple ECG recording. It works by calculating the resultant vector from the QRS complex in lead I and AVF automatically. The electrical heart axis will then be shown in vector degrees. By simply putting the resultant QRS deflection (mm), the application will give you one of the four interpretation results, namely normal heart axis, left axis deviation (LAD), right axis deviation (RAD) and extreme axis deviation.


ECG Heart Axis

The resultant QRS deflection (mm) could be achieved by calculating the resultant amplitude of R wave and S wave (or Q wave if any). If the R wave comes in a positive deflection (e.g +5 mm) and the S wave comes in a negative deflection (e.g -2mm), then we get the resultant QRS deflection of 3 mm. Easy, right? Then you could just let the application do the math for you. 

ECG Heart Axis

Why should you choose ECG: Heart Axis?
- It is simple and very easy to use.
- The calculation is precise and accurate.
- The electrical heart axis is shown in vector degrees.
- Interpretation result is provided.
- It is totally free!

If you find this application helpful please give a positive review and rate us 5 stars! Please feel free to send us email about whatever comes in your mind about our applications or even suggesting us on what application we should work into next. Have a good day!

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