EKG's

[BAM!]

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So how exactly does the flow of ions within the heart create the p qrs t ? I'm talking in terms of electric fields, currents, etc. all of this in regards to lead 2 is fine w me. Any tips or pointers?

thanks

 

[TrishMD]

Some photos and info that might be of help...

http://www.cvphysiology.com/Arrhythmias/A009.htm

 

[taurus70]

Guyton's Physiology textbook has a good section on membrane potentials, gap junctions, and etc. its hard to explain in a post but they did a good job if you want the technical details.

 

[tachycore]

The question actually has 2 parts to consider.

One is the channels mentioned. These behave differently in the various parts of the conduction system. I would recommend the basic points in a Circulation article: http://circep.ahajournals.org/content/2/2/185.full

It has a nice figure showing the relative contributions during each electrical phase.

Two is the electrical conduction system. I agree with Guyton's physiology text for that purpose. It spends 3 chapters on the topic. However, for a clinically applicable model, I would recommend Hurst's Ventricular Electrocardiography. It's freely available online. Just look.