This video explains the foundation of electrophysiology, action potential, polarization, depolarization, and repolarization. It further relates the four properties of cardiac pacemaker cells and applies them to the conduction system of the heart. The relationship of cardiac output to heart rate, stroke volume, preload, afterload and contractility is delineated. It further covers the intrinsic heart rates of different parts of the conduction system in the SA & AV nodes and Purkinje fibers. PQRST waves are explained and related to action potential.
The content of this video is intended to serve as the foundation for the interpretation of EKG dysrhythmias.
For more content on EKG basics - EKG paper, EKG basics - Normal intervals and Rules to Memorize, Sinus rhythms, Atrial rhythms, AV blocks, and Ventricular rhythms please refer to the EKG interpretation playlist of my channel Nursing School Explained.

EKG INTERPRETATION - THE BASICS:
1. Basic Electrophysiology - a foundation for EKG Interpretation [ Ссылка ]
2. EKG Interpretation - The Basics: EKG paper and Determination of Heart Rate [ Ссылка ]
3. The Basics - Normal intervals and RULES to memorize [ Ссылка ]

SINUS RHYTHMS
[ Ссылка ]

ATRIAL RHYTHMS
1. Premature Atrial Contractions (PACs) [ Ссылка ]
2. Atrial Flutter [ Ссылка ]
3. Atrial Fibrillation [ Ссылка ]
4. Supraventricular Tachycardia (SVT) [ Ссылка ]

ATRIOVENTRICULAR RHYTHMS
1. First degree Atrioventricular (AV) Block [ Ссылка ]
2. Second degree Atrioventricular (AV) Block (aka Mobitz Type I or Wenckebach) [ Ссылка ]
3. Second degree Atrioventricular (AV) Block (aka Mobitz Type II or Classical Heart block) [ Ссылка ]
4. Third degree Atrioventricular (AV) Block or Complete Heart Block [ Ссылка ]

VENTRICULAR RHYTHMS
1. Premature Ventricular Complexes/Contractions (PVCs) [ Ссылка ]
2. Ventricular Tachycardia (Vtach) [ Ссылка ]
3. Ventricular Fibrillation (VFib) [ Ссылка ]
4. Pulseless Electrical Activity (PEA) [ Ссылка ]
5. Asystole (aka ventricular standstill) [ Ссылка ]

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