"Multifocal Atrial Tachycardia (MAT)" by KhanAcademyMedicine
Showing posts with label EKG. Show all posts
Showing posts with label EKG. Show all posts
Wednesday, April 8, 2015
Thank God for Khan Academy: EKG: Pulseless Electrical Activity and Asystole
"Pulseless Electrical Activity (PEA) and Asystole" by KhanAcademyMedicine
Thank God for Khan Academy: EKG III--Lead II, An Explanation of Normal Sinus Rhythm
- Your typical EKG P-QRS-T complex figure is a Lead II EKG. It records electrical activity from the SA node towards the bottom left part of your heart (your left leg, actually).
- Tiny boxes=0.04sec
- AV node cells are narrow=slow conduction.
- Sodium channels are FAST at depolarizing.
- ST segment=no net current =/= not active--it's when the ventricles are fully contracted--remember, the EKG is the electrical map and it actually precedes the actual contraction.
- The PR wave is measured instead of the PQ wave because sometimes the Q doesn't show up.
- The direction of which the waves and peaks go dictate whether it is the endocardium or epicardium depolarizes and repolorizes first. (Cool--but not really necessary to understand.)
Wednesday, April 1, 2015
Thank God For Khan Academy: EKG Strips
"SupraVentricular TachyCardia" by KhanAcademyMedicine
https://www.khanacademy.org/science/health-and-medicine/circulatory-system-diseases/dysrhythmias-and-tachycardias/v/electrical-conduction-in-heart-cells
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