Week 3 EKG Interp
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Questions and Answers

What is the mean QRS vector?

  • The sum of all smaller vectors of depolarization (correct)
  • The general direction and magnitude of the movement of depolarization
  • The general direction and magnitude of the movement of repolarization
  • The sum of all smaller vectors of repolarization
  • In which direction does the mean QRS vector normally point in the frontal plane?

  • Downward and to the patient's left (correct)
  • Downward and to the patient's right
  • Upward and to the patient's left
  • Upward and to the patient's right
  • Why does the mean QRS vector point more left?

  • Due to the thicker RV having larger small vectors of repolarization
  • Due to the thicker LV having larger small vectors of depolarization (correct)
  • Due to the thicker RV having larger small vectors of depolarization
  • Due to the thicker LV having larger small vectors of repolarization
  • What is the axis direction if the QRS is upright in lead I, negative in lead aVF, and Lead II is downward (negative)?

    <p>Toward -120 with the presence of LAD</p> Signup and view all the answers

    What can cause a right axis deviation (RAD) according to the text?

    <p>Limb lead reversal</p> Signup and view all the answers

    Which condition does NOT lead to left axis deviation?

    <p>Right ventricular hypertrophy</p> Signup and view all the answers

    What happens to the mean QRS vector if the heart is displaced?

    <p>It moves in the same direction as heart displacement</p> Signup and view all the answers

    In ventricular hypertrophy, how does the mean QRS vector get displaced?

    <p>Toward the hypertrophied side</p> Signup and view all the answers

    How is left axis deviation (LAD) defined in terms of degrees?

    <p>Between -30 and -90 degrees</p> Signup and view all the answers

    What method is suggested for determining the QRS axis?

    <p>Finding the major direction of the QRS complex in leads I and aVF</p> Signup and view all the answers

    Causes of RAD include normal variant and conditions such as right ventricular ________

    <p>hypertrophy</p> Signup and view all the answers

    RAD can also be caused by preexcitation syndromes like Wolff-Parkinson-White syndrome and ventricular ________

    <p>arrhythmias</p> Signup and view all the answers

    Dextrocardia is characterized by the apex of the heart being on the right side of the body, which can lead to ______.

    <p>right axis deviation</p> Signup and view all the answers

    Limb-lead reversal, right ventricular overload syndromes, and ventricular tachycardia are also potential causes of ______

    <p>right axis deviation (RAD)</p> Signup and view all the answers

    Another cause of RAD is right ______ enlargement

    <p>ventricular</p> Signup and view all the answers

    The P wave on an ECG represents ventricular depolarization.

    <p>False</p> Signup and view all the answers

    The QT Interval measures the contraction of the ventricle from the beginning of the Q wave to the end of the T wave.

    <p>False</p> Signup and view all the answers

    A mean QRS vector pointing more left indicates right axis deviation (RAD).

    <p>False</p> Signup and view all the answers

    LAD can indicate the presence of Left Anterior Fascicular Block (LAFB).

    <p>True</p> Signup and view all the answers

    Mechanical shift of the heart in the chest due to conditions like lung disease can lead to Right Axis Deviation (RAD).

    <p>True</p> Signup and view all the answers

    Right Axis Deviation (RAD) can be caused by Ventricular Arrhythmias like atrial fibrillation.

    <p>False</p> Signup and view all the answers

    The QT interval should be less than the preceding R-R interval.

    <p>True</p> Signup and view all the answers

    The J point is the junction at which the S wave meets the ST segment.

    <p>True</p> Signup and view all the answers

    A 12-Lead EKG consists of 6 limb leads and 6 precordial leads.

    <p>True</p> Signup and view all the answers

    The mean QRS axis provides information about the overall electrical activity of the heart.

    <p>True</p> Signup and view all the answers

    Which condition can cause left anterior fascicular block or LBBB, leading to left axis deviation (LAD)?

    <p>Left ventricular hypertrophy</p> Signup and view all the answers

    Which of the following is a potential cause of mechanical shift of the heart in the chest, leading to right axis deviation (RAD)?

    <p>Pulmonary embolism</p> Signup and view all the answers

    What is the normal duration of a Q wave on an ECG?

    <p>Less than 0.04 seconds</p> Signup and view all the answers

    In which phase of the cardiac cycle does the ST segment occur?

    <p>Repolarization</p> Signup and view all the answers

    How is the QTc interval calculated?

    <p>QT interval + square root of RR interval</p> Signup and view all the answers

    Which leads are associated with Lateral Wall MI?

    <p>I, aVL, V5, V6</p> Signup and view all the answers

    What is a potential EKG finding in Posterior Wall MI?

    <p>Tall R waves in V1 and V2</p> Signup and view all the answers

    During which stage does part of the myocardium become electrically inert?

    <p>Stage II: Infarction</p> Signup and view all the answers

    What is the potential consequence of right axis deviation?

    <p>Right ventricular strain</p> Signup and view all the answers

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