Electrocardiogram - Edubirdie

University:
Glendale Community College
Course:
BIO160 | Introduction to Human Anatomy and Physiology
Academic year:

2019
Views:

348

Pages:

4
Author:

jeffcpark25

Electrocardiogram (ECG) • Composite of action potentials of nodal and myocardial cells • Detected, amplified and recorded by electrodes on arms, legs and chest ECG • P wave – SA node fires, atrial depolarization – atrial systole • QRS complex – AV node fires, ventricular depolarization – ventricular systole – (atrial repolarization and diastole signal obscured) • T wave – ventricular repolarization ECG and the Cardiac Cycle 1) atrial depolarization begins 2) atrial depolarization complete (atria contracted) 3) ventricles begin to depolarize at apex; atria repolarize (atria relaxed) 4) ventricular depolarization complete (ventricles contracted) 5) ventricles begin to repolarize at apex 6) ventricular repolarization complete (ventricles relaxed) Diagnostic Value of ECG • Valuable for diagnosing abnormalities in conduction pathways, myocardial infarction (MI), heart enlargement, electrolyte imbalances and hormone imbalances.

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