By M. Gabriel Khan.
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Example text
1-13. Changes in deflections with the heart in a vertical (A) and a horizontal (B) position. In the vertical position (A), both the aVR and aVL face the cavity of the ventricles and record a QS complex. A QRS complex in aVF indicates a heart that is positioned close to vertical; qRS in aVL indicates a horizontal heart position (B). 18 Rapid ECG Interpretation V1 V2 V3 V4 V5 V6 Fig. 1-14. Position of precordial chest leads. T T Figure 1-16 reemphasizes that the position of leads aVL and aVF and other limb leads are in the same frontal plane.
2-3. Step-by-step method for accurate ECG interpretation. Step 1: Assess rhythm and rate. 12 second. • M-shaped complex in V1 and V2. • Slurred S wave in leads 1, V5, V6; and an S wave that is of greater amplitude (length) than the preceding R wave (see Figs. 2-4, 2-6, and 2-7 and Chapter 4, Fig 4-2). 12 second. • A small R or QS wave in V1 and V2. 5 2 3 4 5 6 7 8 9 10 Number of QRS complexes in 6 seconds† 5 × 10 6 7 10 15 20 300 200 150 100 75 60 50 42 38 33 30 50 60 70 100 150 200 *Normal paper speed 25 mm/s.
Therefore, the leads placed on the chest wall V1 to V6 T T T T Fig. 1-15. Magnetic resonance image of heart to illustrate approximate relationship of chest electrodes to cardiac chambers. Points 1 to 6 represent sites of the six precordial electrodes V1 to V6. RA, right atrium; RV, right ventricle; LV, left ventricle; RL, right lung; LL, left lung; A, aorta. ) Chapter 1 / Basic Concepts 19 aVL Anterior wall V5 Inferior wall aVF Fig. 1-16. aVF and aVL are in the same frontal plane. The chest leads encircle the left thorax in a horizontal plane.