Download Rapid ECG Interpretation (3rd Edition) by M. Gabriel Khan PDF

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By M. Gabriel Khan

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Q Waves A myocardial infarct is an area of necrotic cells caused by the blood supply to that area of heart muscle being cut off. , Q waves) will be produced (see Figs. 1-18, 2-18, and 2-19) or the R in V3 through V5 may be considerably decreased; this is termed poor R wave progression (see Chapter 6). Loss of R waves or poor R wave progression in leads V3 through V5 may indicate anterior MI (see Fig. 2-18). • R waves should increase in amplitude from V2 through V4. If R waves are present in leads V1 and V2 and are not present in V4 through V6, a diagnosis of anterolateral MI should be considered (see Fig.

Q waves Normally present in aVR; occasionally in V1 or in aVL (vertical heart) (see Chapter 6). 04 second duration. 5 mm in patients older than age 30. Q waves may be up to 5 mm deep in several leads in individuals age <30. R waves V1: 0 to 15 mm, age 12 to 20 (see Table 2-3). 0 to 8 mm, age 20 to 30. 2 to 12 mm, age <30‡ (see Step 5, Fig. 2-16). ‡ ST segment Isoelectric or <1 mm elevation in limb leads and <1 mm in precordial leads except for normal variant (see Step 4, Fig. 2-12). T wave Inverted in aVR; upright in I, II, and V3 through V6.

22 second in adults). 12 second) in duration, and amplitude <3 mm. Upright in lead I, inverted in aVR (if opposite, suspect reversed arm leads† or dextrocardia) (see Step 6, Figs. 2-21 and 2-36). 1 second, consider incomplete LBBB, incomplete RBBB, or WPW syndrome (see Steps 2 and 3, Figs. 2-4, 2-9, and 2-10). Q waves Normally present in aVR; occasionally in V1 or in aVL (vertical heart) (see Chapter 6). 04 second duration. 5 mm in patients older than age 30. Q waves may be up to 5 mm deep in several leads in individuals age <30.

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