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3 Cards in this Set
- Front
- Back
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Reason to have an ECG: assess heart function |
1. used when patients who complain of chest pain or shortness of breath( to check AMI or heart attack); lightheadedness; palpitation(đánh trống ngực); syncope. 2.No heart attack The ECG help to detect the cause of pain: angina or atherosclarosis( narrowing of blood vessels) 3.Notice that ECG may be normal if the heart disease present. EKG may be needed to find abnormalities. |
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Basic principles of 12-lead ECG |
**chest lead -V1, V2: either side of sternum on the 4th rib( count down from angle sternum, the 2nd rib insertion) -V4: on the apex of the heart -V3: halfway between V2 and V4 -V5, V6: horizontally latterally from V4. **limb lead: -lead 1: right arm-left arm -lead 2: right arm-left leg -lead 3: left leg-left arm. aVR: right arm aVL: left arm aVF:left leg
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The ECG trace: |
-P wave: atrial depolarizations -PR interval: the time between the first deflection of P wave and the first deflection of complex QRS. -QRS wave complex: ventricular depolarization. The rule is: if the wave immediately after P wave is upward-R wave. downward is Q wave. -ST segment: is the time between the end of QRS complex and the start of T wave. it reflects the period of zero potential between ventrical depolarization and repolarization. -T wave: ventricle repolarization. |
