ahmad24
عدد المساهمات : 95
تاريخ التسجيل : 16/01/2010
العمر : 38
 |  موضوع: Electrocardiographs  السبت فبراير 13, 2010 4:36 am | |
| Electrocardiographs
What does "Electrocardiograph" mean
ECG
Electro = electrical activity
Cardio = heart
Graph = machine to record
Electrocardiograph = machine to record the electrical activity of the heart
What does it do
It records and measures the electrical activity of the heart. It is used to measure the heart rate and to diagnose heart problems
Physiology
The cells inside the heart muscle conduct electrical current. Some cells in the heart (the pace-maker cells) charge by themselves regularly and they cause the other cells to charge. A current flows through the heart muscle in a particular way. Every time this happens the heart muscle contracts and pumps the blood – “heart beat”
How it works
The tissues in the human body are electrical conductors and when the electrical current flows in the heart we can measure it in the surface of the body
ECG electrodes are made of silver-silverchloride and they are stuck to the skin together with ECG gel. The electrical signals from the heart are picked up by these electrodes and measured and recorded by the ECG machine
Units of measurement
Beats per minute (BPM)
Measurement of amplitude in mV
Typical values
Adults: 50 – 90 BPM
Neonates: 120 – 180 BPM
The repetitive electrical signal produced by the Heart and measured at the patient
electrodes is approx. 1 mV in amplitude
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هيبة ملك
عدد المساهمات : 17
تاريخ التسجيل : 15/02/2010
العمر : 35
| | موضوع: رد: Electrocardiographs الأحد فبراير 28, 2010 5:40 am | |
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يعطيكـ 1000 عافيه الموضوع جداً شيق .. تقبل مروري ..  .. هيبة ملك | |
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