Step 2: Measure Important Intervals

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Analysis and Interpretation of the Electrocardiogram

Analysis and Interpretation of the Electrocardiogram Introduction How to use this module Objectives The 12 lead ECG Waves and complexes Intervals and segments Normal values Approach to the ECG Step 1: Determine the heart rate Step 2: Measure important intervals Step 3a: Calculate the electrical axis Step 3b: Calculate the electrical axis Step 3c: Calculate the electrical axis Step 4: Evaluate the cardiac rhythm Step 5: Inspect P waves for atrial enlargement Step 6: Inspect QRS complexes for ventricular hypertrophy or low voltage Step 7a: Inspect QRS complexes for bundle branch block or fascicular block Step 7b: Inspect QRS complexes for bundle branch block or fascicular block Step 7c: Inspect QRS complexes for bundle branch block or fascicular block Step 7d: Inspect QRS complexes for bundle branch block or fascicular block Step 7e: Inspect QRS complexes for bundle branch block or fascicular block Step 8: Assess Q waves and determine significance Step 9: Assess ST segments and T waves Step 10: Measure QT interval for specific diagnoses ECG index Cases Printable version Credits Links

Step 2: Measure important intervals

The measurement of important electrocardiographic intervals usually includes the PR interval, the QRS interval and the QT interval. At a standard paper speed of 25 mm/second, the width of each small square (1mm) represents 0.04 seconds. One large square (5mm) represents 0.2 seconds.

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Step 2: Measure Important Intervals

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