PHGY 210 Lecture Notes - Lecture 12: Premature Atrial Contraction, Spiral Wave, Wavefront
26 Feb 2013
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Lecture 12 - cardiovascular physiology (part 6 of 9) (1) mapping of cardiac electrical activity (2) reentrant ventricular tachycardia. *the qrs complexes in the previous gure is not generated by the sa node. We ll see what it s generated by in a minute. To understand what s happening in v. tach you have to map the spread of action potentials in the ventricular muscle. The rst way that this was done was using this kind of set up. You see the meshwork which is called the sock electrode and the little circles are electrodes of which there are probably around 64. This is placed over the heart on the epicardial surface of the heart. These go off to the computer which decides which of the 64 guys red rst, which of them red second etc. And it makes an activation map of the spread of the action potentials on the ventricle (will see this on the next slide).
