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19 Ιουν 2013 · This animation features the heart and circulatory system and how they work. For more information, visit: http://www.mayoclinic.com/health/heart-disease/DS0...
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The axis is calculated (to the nearest degree) by the ECG machine. The axis can also be approximated manually by judging the net direction of the QRS complex in leads I and II. The following rules apply: Normal axis: Net positive QRS complex in leads I and II. Right axis deviation: Net negative QRS complex in lead I but positive in lead II.
17 Αυγ 2023 · The cardiac conduction system is a network of specialized cardiac muscle cells that initiate and transmit the electrical impulses responsible for the coordinated contractions of each cardiac cycle.
What do the segments of the ECG represent? P-wave: Atrial contraction. PR interval: Represents the time taken for excitation to spread from the sino-atrial (SA) node across the atrium and down to the ventricular muscle via the bundle of His. QRS: Ventricular contraction. ST segment: Ventricular relaxation.
There are a number of ways (of varying accuracy) via which to calculate a cardiac axis using an ECG and the hexaxial reference system, pictured below. Method 1. The Quickest Way. It’s as simple as following this table: Method 2. The Nearest 30° Identify the most isoelectric lead on the ECG and then on the hexaxial reference diagram
Cardiologists analyze the heart using cardiac axes. These axes are also used in cardiac CT/MR and must be reconstructed in order to assess the heart properly. Axial slices, such as those imaged on the left, are useful for a global assessment of the morphology of the heart and its relation to the pericardium.
