EKG Middle3 Left – The Premier EKG Resource for Medical Professionals – EKG MD – Dr. Anthony Kashou

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Question of the Day

Which of the following is a precordial lead?

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The Premier EKG Resource for Medical Professionals - EKG MD - Dr. Anthony Kashou
  • EKG A-Z
  • Practice
    • Rhythm Challenge
    • Questions
    • CV Board Review
  • Lectures
    • The Basics
    • Rhythms
    • P Wave & PR Interval
    • QRS Complex
    • ST Segment & T Wave
    • Conduction Defects
    • Ischemia & Infarction
    • Practice
    • Miscellaneous
    • EKG of the Week
    • Question of the day
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The Premier EKG Resource for Medical Professionals - EKG MD - Dr. Anthony Kashou
    The Premier EKG Resource for Medical Professionals - EKG MD - Dr. Anthony Kashou
    The Premier EKG Resource for Medical Professionals - EKG MD - Dr. Anthony Kashou
    • EKG A-Z
    • Practice
      • Rhythm Challenge
      • Questions
      • CV Board Review
    • Lectures
      • The Basics
      • Rhythms
      • P Wave & PR Interval
      • QRS Complex
      • ST Segment & T Wave
      • Conduction Defects
      • Ischemia & Infarction
      • Practice
      • Miscellaneous
      • EKG of the Week
      • Question of the day
    • Contribute
      • Clinical Case
      • EKG A-Z Topic
    • EKG Course
    • About Us
    • Did You Know?
    • Question of the day
    • Login
    • Course Login
      Contents
      EKG Middle3 Left
      Right Atrial Enlargement (Pediatric)
      Right Atrial Enlargement (Pediatric)
      Overview: No significant age-related differences for P wave amplitude to define RAE in children Therefore, adult RAE diagnostic criteria applied for all ages ECG features: Assumes sinus rhythm present P wave amplitude (≥1 of the following): II: ≥2.5 mm V1 or V2: initial positive deflection ≥1.5 mm
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      Heart Rate
      Heart Rate
      Heart rate (HR): measure of the frequency of cardiac cycles; expressed in beats per minute (BPM) Determining Heart Rate 3-step approach: (1) Locate R wave that falls on or near thick line (2) Count # of thick lines until next R wave (3) Use “300-150-100-75-60-50” rule Regular rhythms: If HR
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      P Wave (Adult)
      P Wave (Adult)
      Overview P wave: 1st positive/negative deflection & start of cardiac cycle Cardiac event: atrial depolarization Begins when SA node (normal) or neighboring atrial pacemakers fire; includes impulse transmission through internodal pathways, Bachmann bundle, & atrial myocytes 3 specialized pathways containing Purkinje fibers connecting SA node to AV node: (1) anterior,
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      PR Segment (Adult)
      PR Segment (Adult)
      Overview PR segment: flat, typically isoelectric segment representing time from end of P wave to start of QRS complex (note: does not include P wave) Cardiac event: impulse transmission through AV node, His bundle, bundle branches, & ventricular Purkinje system AV node allows for critical delay in conduction system &
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      Hyperthyroidism
      Hyperthyroidism
      ECG features: may precede clinical manifestations Rhythm disturbances: Atrial fibrillation: Incidence increases with age [1,2] May spontaneous revert to sinus rhythm after treatment [1,2] Frequency may be greater in triiodothyronine (T3) toxicosis compared to when both T3 & thyroxine (T4) are increased [3] Sinus tachycardia: More common than atrial fibrillation
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