Chp 13 ECG Lead System Flashcards
32 Questions
100 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What are Standard Limb Leads comprised of?

  • Leads V1, V2, V3
  • Leads I, II, III
  • Leads I, II, III, aVR, aVL, aVF (correct)
  • Leads aVR, aVL, aVF

    • What is Lead I?

    Right arm aVR to left arm aVL, with the right arm being negative and the left arm being positive.

    What is Lead II?

    Right arm aVR to left leg aVF, with the right arm being negative and the left leg being positive.

    What is Lead III?

    <p>Left arm aVL to left leg aVF, with the left arm being negative and the left leg being positive.</p> Signup and view all the answers

    What does aVR indicate?

    <p>The right arm is positive; the right leg, left leg, and left arm are negative.</p> Signup and view all the answers

    What does aVL indicate?

    <p>The left arm is positive; the right arm, right leg, and left leg are negative.</p> Signup and view all the answers

    What does aVF indicate?

    <p>The left leg is positive; the right arm, right leg, and left arm are negative.</p> Signup and view all the answers

    What are Bipolar Leads?

    <p>Leads I, II, III</p> Signup and view all the answers

    What is Einthoven's Triangle?

    <p>An imaginary equilateral triangle with the heart at its center, formed by the axes of the three bipolar limb leads.</p> Signup and view all the answers

    What are Unipolar Leads?

    <p>Leads aVR, aVL, aVF that monitor electrical activity with a positive electrode and a reference point.</p> Signup and view all the answers

    What is an example of Frontal Plane?

    <p>The electrical activity that flows over the anterior surface of the heart; from the base to the apex of the heart, in the right to left direction.</p> Signup and view all the answers

    What do Left Lateral Leads monitor?

    <p>Leads I and aVL monitor the left lateral side of the heart.</p> Signup and view all the answers

    What is the role of Inferior Leads?

    <p>Leads II, III, and aVF view the lower surfaces of the heart.</p> Signup and view all the answers

    What do Precordial Leads monitor?

    <p>They monitor the heart from the horizontal plane and record electrical activity traversing the heart.</p> Signup and view all the answers

    What do V1 and V2 leads monitor?

    <p>Monitor the right ventricle.</p> Signup and view all the answers

    What do V3 and V4 leads monitor?

    <p>Monitor the ventricular septum.</p> Signup and view all the answers

    What do V5 and V6 leads view?

    <p>View the left ventricle.</p> Signup and view all the answers

    What do Anterior Leads comprise?

    <p>Leads V1, V2, V3, and V4.</p> Signup and view all the answers

    What do Lateral Leads comprise?

    <p>Leads V5 and V6.</p> Signup and view all the answers

    What is the duration of a Small Square on the ECG?

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

    What is the duration of a Large Square on the ECG?

    <p>0.20 seconds.</p> Signup and view all the answers

    What does Amplitude represent in an ECG?

    <p>The vertical portion of each small square.</p> Signup and view all the answers

    What are Waveforms in an ECG?

    <p>Begins and ends at the baseline.</p> Signup and view all the answers

    What are Complexes in an ECG?

    <p>Two or more waveforms together.</p> Signup and view all the answers

    What are Segments in an ECG?

    <p>A flat, straight, or isoelectric line.</p> Signup and view all the answers

    What are Intervals in an ECG?

    <p>A waveform or complex connected to a segment.</p> Signup and view all the answers

    How are positive ECG tracings described?

    <p>All ECG tracings above the baseline are described as positive.</p> Signup and view all the answers

    How are negative ECG tracings described?

    <p>Waveforms below the baseline are described as negative.</p> Signup and view all the answers

    What does the P wave represent?

    <p>The normal cycle of electrical activity in the heart begins with atrial depolarization.</p> Signup and view all the answers

    What is the PR interval?

    <p>Starts at the beginning of the P wave and ends at the beginning of the QRS complex.</p> Signup and view all the answers

    What does the QRS complex represent?

    <p>Ventricular depolarization.</p> Signup and view all the answers

    What does the ST segment represent?

    <p>The time between ventricular depolarization and repolarization.</p> Signup and view all the answers

    Study Notes

    ECG Lead System Overview

    • Standard limb leads consist of leads I, II, III, aVR, aVL, and aVF, derived from electrodes on arms and legs.

    Lead Definitions

    • Lead I: Connects right arm (aVR, negative) to left arm (aVL, positive).
    • Lead II: Connects right arm (aVR, negative) to left leg (aVF, positive).
    • Lead III: Connects left arm (aVL, negative) to left leg (aVF, positive).

    Unipolar and Bipolar Leads

    • Bipolar leads: Leads I, II, III use one positive and one negative electrode.
    • Unipolar leads: aVR, aVL, aVF monitor heart activity between one positive electrode and a reference point.

    Einthoven's Triangle

    • An imaginary equilateral triangle encompassing the heart formed by the axes of the bipolar limb leads.

    Heart Surface Monitoring

    • Frontal plane: Monitors electrical activity from the base to the apex in a right to left direction.
    • Left lateral leads: Leads I and aVL focus on the left lateral side.
    • Inferior leads: Leads II, III, aVF observe the lower surfaces.
    • Precordial leads: Unipolar; record electrical activity across a horizontal plane.

    Precordial Lead Positions

    • V1 and V2: Monitor the right ventricle.
    • V3 and V4: Monitor the ventricular septum.
    • V5 and V6: View the left ventricle.

    Lead Classification

    • Anterior leads: V1, V2, V3, V4.
    • Lateral leads: V5 and V6.

    ECG Measurement

    • Small square: Has a duration of 0.04 seconds.
    • Large square: Comprises five small squares with a duration of 0.20 seconds.
    • Amplitude: Represented by the vertical portion of each small square.

    ECG Waveforms and Segments

    • Waveforms: Begin and end at baseline.
    • Complexes: Composed of two or more waveforms.
    • Segments: Flat, isoelectric lines.
    • Intervals: Combination of waveforms or complexes with segments.

    ECG Wave Characteristics

    • Positive deflections: Represented by ECG tracings above the baseline.
    • Negative deflections: Occur below the baseline.

    Specific Wave Details

    • P wave: Indicates atrial depolarization; symmetric and upright shape; amplitude of 0.2 to 0.3 mV.
    • PR interval: From the start of the P wave to the beginning of the QRS complex; normal duration is 0.12 to 0.20 seconds.
    • QRS complex: Represents ventricular depolarization; duration is typically less than 0.12 seconds.
    • ST segment: Time between ventricular depolarization and repolarization; measures 0.12 seconds or less, starts at the J point.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Description

    Test your knowledge of the ECG lead system with these flashcards. Each card covers different standard limb leads and their definitions, providing a comprehensive review of Chapter 13 concepts. Perfect for students preparing for exams on ECG interpretation.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser