MASTERING THE 12-LEAD ECG

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OBJECTIVES

 
Describe the characteristics of a normal 12-lead ECG.

Calculate the mean QRS axis on the 12-lead ECG.

Given various 12-lead ECGs of critically ill patients, identify the following:

  • right bundle branch block

  • left bundle branch block

  • left anterior fascicular block

  • left posterior fascicular block

  • bifascicular block


  • Describe the relationship between anterior MI, left axis deviation, and the development of potentially life-threatening conduction defects.

    Explain the potentially life-threatening complication that may occur during insertion of a pulmonary artery catheter in a patient with a left bundle branch block.

    Discuss why analysis of the 12-lead ECG is of limited use in the diagnosis of MI if the patient has a left bundle branch block.

    Given various 12-Lead ECGs of critically ill patients, identify:

  • right ventricular hypertrophy

  • left ventricular hypertrophy


  • Identify the anatomic location of myocardial infarction, including:

  • anterior MI

  • inferior MI

  • lateral MI

  • posterior MI


  • Identify ST segment abnormalities on a variety of 12-lead ECGs.

    Identify a right ventricular myocardial infarction via interpretation of the 12-lead ECG.

    Evaluate the QT interval and explain its significance in patients receiving various medications.

    Recognize ECG manifestations of various life-threatening electrolyte disturbances.

    Interpret 12-lead ECGs using a step-by-step approach.

     

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