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Published byLynne Farmer Modified over 8 years ago
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AV Blocks First-Degree AV Block PR interval >0.21 seconds Second-Degree AV Block (Mobitz I) Progressive delay until conduction blocked Second-Degree AV Block (Mobitz II) Conduction of selected impulses through the AV node Third-Degree AV Block No atrial impulses are conducted through the AV node Atria and ventricles fire at their intrinsic rates
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Bundle Branch Blocks Right Bundle Branch Block
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The Turn-Signal Rule QRS >0.12 seconds throughout the ECG Look at the QRS in V1 Identify the J point Draw a horizontal line Triangle pointing up indicates RBBB Triangle pointing down indicates LBBB
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Hemiblocks Left Posterior Hemiblock Principal finding is a rightward shift in the QRS axis
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Hemiblocks Left Anterior Hemiblock Principal abnormality is a shift in the QRS axis far to the left
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Left Bundle Branch Block
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Right Bundle Branch Block
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Chamber Enlargement Atrial Enlargement Ventricular Hypertrophy Causes Right-sided enlargement and hypertrophy Secondary to long-term pulmonary disease Left-sided enlargement and hypertrophy Secondary to long-term hypertension
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Right Atrial Enlargement
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Left Atrial Enlargement
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Right Ventricular Hypertrophy
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Left Ventricular Hypertrophy
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Cardiac Conductive System ECG Recording ECG Leads Mean QRS Axis Determination The Normal 12-Lead ECG Disease Findings Conduction Abnormalities Prehospital ECG Monitoring
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