심전도

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심전도에 대한 보고서 자료입니다.

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본문내용

F. Rhythmic Excitation of the Heart  (심장의 율동적 흥분)
1. 전도속도 (conduction velocity)
중략
2. 동방결절 (SA node): small spindle shaped specialized muscle cell
1) 안정막 전압 (resting membrane potential): -55 to -60 mV
2) 향도잡이 전압 (pacemaker potential): 72 beats/min
3. Internodal pathways (결절간 경로)
          anterior (Bachmann) nodal tract
          middle (Wenckebach) nodal tract
          posterior (Thorel) nodal tract
     ● Direction of sum vector: anterior, downward, and left
4. 방실결절 (A-V delay): more than 0.1 second
5. 좌,우 각 (Rt. & Lt. Bundle branch=Purkinje fiber)
     ● Direction of sum vector: downward and left
       1) left to right, anterior, and toward the head
       2) base to apex, posterior, and left
       3) apex to base, posterior, and left 혹은 apex to base, anterior and right
    ● Rapid spread (0.06 sec) prevents arrhythmia - 빠른 전도가 부정맥 방지
● potential difference (전압 차이)
● extracellular recording (세포외 기록)
A. Depolarization (탈분극) and Repolarization  (재분극)
B. 심전도의 유도 (Electrocardiographic leads)
1. 표준지 유도 (Bipolar standard leads)
2. 단극지 유도 (Unipolar limb leads)와 증폭된 단극지 유도 (Augmented limb leads)
VR=RA-(RA+LA+LL) aVR=RA-(LA+LL)/2
VL=LA-(RA+LA+LL) aVL=LA-(RA+LL)/2
VF=LL-(RA+LA+LL) aVF=LL-(RA+LA)/2

3. 흉부유도 (Unipolar precordial leads or chest leads)
V1: 4th intercostal space at the right sternal border
V2: 4th intercostal space at the left sternal border
V3: Equidistant between V2 and V4
V4: 5th intercostal space in the left midclavicular line
V5: Anterior axillary line
V6: Midaxillary line

키워드

질환,   심근세포의활동전압,   심장세포의수축,   심장기능의조절,   심장의율동적흥분,   심전도의유도 ,   정상심전도의벡타분석,   심박수 (Heart Rate) 측정