myocardial ischemia & infarction ekg pattern · myocardial ischemia & infarction ekg...
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![Page 1: Myocardial ischemia & Infarction EKG pattern · Myocardial ischemia & Infarction EKG pattern Author: pikul Created Date: 5/7/2011 6:52:08 AM](https://reader035.vdocuments.pub/reader035/viewer/2022062506/5ee3781fad6a402d666d5094/html5/thumbnails/1.jpg)
Myocardial ischemia & InfarctionEKG pattern
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การวนจฉยโรค
1. อาการและอาการแสดง
2. คลนไฟฟาหวใจ EKG :
ST segment elevation หรอ ST depress
3. Cardiac enzyme :
CPK : CK-MB
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การเปลยนแปลง
ของคลนไฟฟาหวใจ
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normal
Hyperacute T wave Minute-hours
ST-elevation 0-12 hours
Q-wave DevelopingOver 1-12 hours
ST-elevation With T wave inversion 2-5 days
T wave recovery Weeks-months
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EKG criteria for CAD1. With ST elevation
J point ST h in ≥ 2 contiguous leads≥ 2 mm in V1-V3 & ≥ 1 mm in other leads
2. Without ST elevation≥ 1 mm horizontal or down sloping ST i in ≥ 2
contiguous leadsT wave inversion ≥ 1 mm in ≥ 2 contiguous leads
3. New left bundle branch block
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Noninfarction
SubendocardialIschemia
(classic angina)
Non-Q wave
(no-ST elevation)
Infarction + enzyme positive
Transient ST depression
ST depression or T wave inversions without Q wave
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Acute unstable angina- ST depress และ T inversion - Negative enzyme study
- Dynamic EKG change with symptom
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Q wave infarctionNew Q wave with
Hyperacute
T waves / ST elevations
Followed byT wave inversions
Noninfarction
Transmural ischemiaTransient ST elevations
or paradoxical T wave
normalization,
sometimes followedby T wave inversions
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ST elevation & depression
Isoelectric line Elevated Depressed
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Measure ST segment 60 or 80 ms after the J point
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Left Anterior Descending ( LAD ) occlusion
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Anterior wall MI
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Best Monitoring
Left Anterior Descending (LAD) :
V2
V3
V4
เหนนอยกวา
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Reciprocal change
IIIIIaVF
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Hyperacute T waves in early LAD occlusion
ตางกบ EKG ทพบใน Hyperkalemia อยางไร
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Anterior MI with LAD occlusion distal to 1st diagonal branch
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Anterior Wall MI
• LAD occlusion proximal to 1st diagonal branch
– ST ใน lead I หรอ aVL
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LAD occlusion proximal to 1st diagonal branch
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Left circumflex artery occlusion
Apical leads
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Inferior wall 10 % Posterior wall 10 %SA node 45 % AV node 10 %
( % ของผปวย )
LA เกอบทงหมด
25 % ของ LVAntero-lateal LV
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Left circumflex artery occlusion
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Best Monitoring
Left circumflex artery (LCx)
- lateral ( V5- V6 )- inferior ( III, aVF, II )
- posterior ( V1,V2 ,V3 )
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Right
Coronary Artery
SA 55 % Septal wall บางสวน HIS bundleAV node 90 % RV Posterior inferior ของ LBB
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Inferior wall MI
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Best Monitoring
•Right Coronary Artery (RCA) - III เหน ST elevate ไดสงทสด
- aVF รองลงมา
- II เหนชาทสด
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Reciprocal change
• I
• aVL
• V1-V4
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Dominant right coronary artery occlusion
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Dominant right coronary artery occlusion
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Posterior wall MI
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Posterior wall MI• EKG signs of infarction of contiguous areas
– Posterior wall : ST V1 – V3,
ST V7 – V9
R wave สงขนใน lead V1-V3
– RV infarction : ST V1 & RV leads
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Posterior wall : R wave สงขนใน lead V1-V3Mirror image
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Standard Chest Leads
Right Ventricular Leads
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Best Monitoring• LCx - lateral ( V5- V6 )
- inferior ( III, aVF, II )- posterior ( V1,V2 ,V3 )
• LAD - V2 , V3
•RCA - III , aVF , II