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Chapter 7 Electrocardiograph

Chapter 7 Electrocardiograph. 1. Diastasis ( 심박정지기 ) - 심장의 수축작용이 끝난 직후 , AV valve open - 각 심방과 심실이 혈액으로 가득 차있는 상태 2. Atrial contraction - 심방 압력의 증가 , 심실 용적과 압력의 증가 ( 심방의 혈액이 심실로 이동하므로 ) - AV valve open 3. Ventricular isometric contraction

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Chapter 7 Electrocardiograph

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  1. Chapter 7Electrocardiograph

  2. 1. Diastasis (심박정지기) - 심장의 수축작용이 끝난 직후, AV valve open - 각 심방과 심실이 혈액으로 가득 차있는 상태 2. Atrial contraction - 심방 압력의 증가, 심실 용적과 압력의 증가 (심방의 혈액이 심실로 이동하므로) - AV valve open 3. Ventricular isometric contraction - 심실의 압력증가 (체적은 초기상태 유지) - 압력의 증가로 인한 AV value close (체적은 더 이상 변하지 않음) - 혈관압력 : Pulmonary Artery (from RV) - 7mmHg, Aorta (from LV) – 80mmHg - Aortic valve, Pulmonary valve는 충분한 압력이 형성될 때 까지 closed 4. Ventricular ejection - Ventricular Pressure가 Aorta 압력(80mmHg)을 초과하면 Aortic valve open - 최고압력이 125mmHg 정도에 달하면 심실 근섬유는 더 이상 수축을 못하고, 심실 압력과 aortic pressure가 떨어짐 5. Isometric relaxation - 심실압력이 충분히 떨어지면 aortic valve와 pulmonary valve closed - 심실압력은 계속 떨어지지만, 심방의 압력보다는 높으므로 심방으로부터 혈액이 흘러오지는 않음 6. Ventricular filling - 심실 압력이 심방압력보다 떨어지면 AV valve가 open되고 심실에 혈액이 차기 시작 - 심실이 최대 용량에 도달하면 혈액의 유압이 감소 (Diastasis) Mechanical Activity of the Heart

  3. Transmembrane Potential of Specialized Fibers

  4. The Normal ECG

  5. Cardiac Depolarization, Repolarization and Instantaneous Vectors

  6. ECG – Placement of the Electrodes

  7. ECG – Standard Limb Lead

  8. ECG – Augmented Limb Lead

  9. ECG – Chest (Precordial) Lead

  10. 12 Lead ECG

  11. Block Diagram of ECG Device

  12. Block Diagram of Fetal ECG

  13. ECG and Power Line Interface • Patient is coupled by stray capacity to a , power line • A different amplifier has a driving point Impedance at each lead • Compute the voltage and

  14. Right Leg Driven Circuit • Patient is coupled by stray capacity to a , power line • • • Compute the voltage

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