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Arterial Supply to Heart

Arterial Supply to Heart. Venous Supply to Heart. Myocardial Action Potential. CONDUCTION PATHWAY. Cardiac Cycle. Origin of ECG Waves and Intervals-P wave and PR Interval. The P wave indicates atrial depolarization as the impulse travels through the atria.

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Arterial Supply to Heart

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  1. Arterial Supply to Heart

  2. Venous Supply to Heart

  3. Myocardial Action Potential

  4. CONDUCTION PATHWAY

  5. Cardiac Cycle

  6. Origin of ECG Waves and Intervals-P wave and PR Interval • The P wave indicates atrial depolarization as the impulse travels through the atria. • The PR interval represents AV conduction time, or the time it takes the impulse to travel throughtthe atria, through the AV node, and down to where the ventricles begin to depolarize. Most of the length of the PR interval is delay in the AV node.

  7. Origin of ECG Waves and Intervals-QRS Complex • The QRS complex represents ventricular depolarization as the impulse travels through both ventricles. The QRS width represents intraventricular conduction time.

  8. Origin of ECG Waves and Intervals-T Wave and ST Segment • The T wave represents ventricular repolarization as ventricles return to resting electrical state. • The ST Segment represents early repolarization phase and extends from the end of the QRS Complex to the beginning of the T Wave. ST elevation or depression can indicate a myocardial infarction (MI).

  9. NSR, ST, and SB • The most common rhythm of the heart is called Normal Sinus Rhythm (NSR). This is due to the fact that the rhythm is initiated in the SA node. NSR also contains a P Wave, QRS Complex and a T Wave within the NSR limits. NSR has a rate of between 60-100 beats per minute (bpm). Anything faster than 100 bpm is called Sinus Tachycardia (ST) and below 60 is considered to be Sinus Bradycardia (SB). The rate is determined by measuring the distance between each ventricular beat on a EKG strip.

  10. Heart Disorders Congestive Heart Failure

  11. Atherosclerosis

  12. Coronary By-pass Surgery

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