12 Lead ECG (2) (1).pdf - Revision of 12 lead EKG and cardiac surgeries Ambreen Gowani Acknowledgement Saleema Allana Changes In the ECG \u2022 When the

12 Lead ECG (2) (1).pdf - Revision of 12 lead EKG and...

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Revision of 12 lead EKG and cardiac surgeries Ambreen Gowani Acknowledgement: Saleema Allana
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2 When the coronary blood supply to the heart muscle is actually compromised, three ECG changes may be recorded: Ischemia (T wave change) Injury (ST segment change) Infraction (QRS change) Changes In the ECG
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5 Myocardial Injury Myocardial injury (ST segment change) denotes as acute reduction in the coronary blood supply causing injury to ventricular heart muscle.
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6 Myocardial Infarction Myocardial infarction denotes death or necrosis of ventricular heart muscle when the compromised coronary blood supply is not reestablished. The heart muscle cells do not recover or regenerate; instead, a scar forms in the area of infarction.
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Primary ST-T Wave changes Drug effects (e.g., digoxin, quinidine, etc) Electrolyte abnormalities (e.g., hypokalemia) Ischemia, infarction, inflammation, etc Neurogenic effects (e.g., subarrachnoid hemorrhage causing long QT)
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"Secondary" ST-T Wave changes ST-T changes seen in bundle branch blocks ST-T changes seen in nonspecific Intra Ventricular Conduction Delay ST-T changes in PVCs, ventricular arrhythmias
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9 Myocardial infarction is depicted by the appearance of Q waves. Insignificant Q waves < 0.04 second are normally present in ECG leads I, aVL, V5, and V6 Significant Q waves of myocardial infarction are > 0.04 second and >2mm deep. Old MI
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ST Elevation and non-ST Elevation MIs
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  • Fall '19
  • infarction

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