Step 1: Determine The Heart Rate

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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 1: Determine the heart rate

There are a number of strategies for determining the heart rate. A simple, quick technique is to find a QRS complex that falls on a major vertical grid-line (1), then count the number of large squares to the next QRS complex (2). Dividing this number into 300 gives you the heart rate. In the ECG below, there are 2 large squares between QRS complexes. 300/2 gives a heart rate of 150 beats per minute.

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Step 1: Determine The Heart Rate

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