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Biosignal Experiment

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Words 1793
Pages 8
Elnaz Najafi
BE 413/513
Final Project Instructor: Dr. Chris Raub
Due Date: Friday, May 5th,2017, 11:59pm

Introduction to Biosignals:
Bio-signals are signals created by live creatures and biomedical devices make us able to measure these bio-signals. We can divide biosignals into two different kinds: Electrical biosignals and Non-electrical biosignals. In this project we focus on an electrical biosignal. Electrical biosignals are coming from electrical currents produced by electrical voltage produced by living cells. One of the most important bioelectrical signals that I am going to talk about in my final project is ECG or Electrocardiogram.

Introduction to ECG:

Electrocardiogram or ECG measures the electrical activity of the heart using …show more content…
If the QRS is present and the pattern is sever, it is a sign of atrial flutter. Also, a sine wave shows ventricular flutter, and the absence of P waves with wide QRS complexes is ventricular tachycardia. Therefore, it is very important to consider the rate and rhythm of the heart beat in ECG recording.
Moreover, axis is another factor that we can study from the ECG recording for clinical diagnosis. The QRS axis shows the direction of the ventricular depolarization in heart beat. A normal QRS axis should be in the range of −30° to 105°. If this value is more than +105°, right axis deviation, it shows right ventricular hypertrophy or left posterior fascicular block. If this value is less than −30°, left axis deviation, it shows a left ventricular hypertrophy or left anterior fascicular block.
Also, the waves and the distance between them have a normal range of time duration and the amplitudes (voltages). P wave larger than 80ms represents atrial enlargement, PR wave larger than 200ms indicates first degree atrioventricular block, tall QRS complex indicates left ventricular hypertrophy, and QRS complex with small voltage indicates pericardial effusion or infiltrative myocardial

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