1 / 14

Lesson 1, 2 ELECTROCARDIOGRAPHY

Lesson 1, 2 ELECTROCARDIOGRAPHY. 2010. 05. 27 Ji-Won Kim. Main function of the heart . Pulmonary circuit To oxygenate the blood To remove carbon dioxide Systemic circuit To deliver oxygen to tissues To deliver nutrients to tissues. 동영상. Three types of cells for heart beat.

ulric-franklin
Download Presentation

Lesson 1, 2 ELECTROCARDIOGRAPHY

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Lesson 1, 2ELECTROCARDIOGRAPHY 2010. 05. 27 Ji-Won Kim

  2. Main function of the heart • Pulmonary circuit • To oxygenate the blood • To remove carbon dioxide • Systemic circuit • To deliver oxygen to tissues • To deliver nutrients to tissues 동영상

  3. Three types of cells for heart beat • Rhythm generators (SA node: pacemaker) • Conductors • Contractile cells (myo-cardium)

  4. 심장세포의 전기적 활동 • 심장세포내에는 많은 이온(Na+, K+, Ca+, Cl-)이 세포내외를 이동하면서 전기적 활동 • 분극(Polarization) : 흥분하지 않은 휴식상태. 안정기 • 탈분극(Depolarization) : 세포의 흥분 후 일어나는 변화 • 재분극(Repolarization) : 다시 안정기. 전기배열과 이온배열이 원 상태로 되돌아 옴

  5. 심장 탈분극의 전도 (Electro-conduction)

  6. Modulation of Heart rate and strength of contraction • Sympathetic (교감) system • Acts as an accelerator, speeding up and increasing the contractile force of the heart • Para-sympathetic (부교감) system • Acts as a brake, slowing down the heart

  7. Electrocardiogram • Pwave • Result from atrial depolarization • QRS wave • Result of ventricular depolarization • Twave • Result from ventricular repolarization

  8. Electrocardiogram • PR interval • The time it takes for the impulse sent from the SA node to travel to the ventricles • PR segment • The time of AV nodal delay and transmission to the ventricles

  9. Experimental objectives • To become familiar with the electrocardiograph • Electrical events vs. mechanical events • To observe rate and rhythm changes • Associated with body position and breathing

  10. Lead • Spatial arrangement of two electrodes on the body • Electrode placement • Positive and negative electrodes • Defines recording direction of the lead • Lead axis (vector) • Determined by the direction going from the negative to positive electrode • ECG recorder • Computes the voltage difference between the positive and negative electrodes

  11. 표준사지유도 (Standard bipolar limb lead) • 두 전극 사이의 전압의 차를 절대치로 기록하는 양극 유도방식 • 심장을 전방에서 종축(종단면)으로 바라보는 방향 Einthoven’s Triangle

  12. Chest(Precordial) lead(흉부유도) : Horzontal plane V1, V2, V3, V4, V5, V6 V1: right 4th intercostal space V2: left 4th intercostal space V3: halfway between V2 and V4 V4: left 5th intercostal space, mid-clavicular line V5: horizontal to V4, anterior axillary line V6: horizontal to V5, mid-axillary line

  13. Mean electrical axis (mean cardiac vector)

  14. Experimental objectives • Record ECG from lead 1 and 3 • Lying down, sitting up and breathing deeply while sitting • Review the ECGs for lead 2 • Direction of QRS complex vs. the direction of the lead axis • Estimate the mean electrical axis of the QRS complex

More Related