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Understanding EKGs. Vectors. A vector has direction A vector has magnitude Vectors can be added or summated. Vector A. Vector B. Resultant Vector. A + B. EKG 2. EKG 3. Normal Waves of the EKG. P wave – atrial depolarization T a wave – atrial repolarization

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Presentation Transcript
vectors
Vectors
  • A vector has direction
  • A vector has magnitude
  • Vectors can be added or summated
slide3

Vector A

Vector B

Resultant Vector

A + B

normal waves of the ekg
Normal Waves of the EKG
  • P wave – atrial depolarization
  • Ta wave – atrial repolarization
  • Q wave – initial negative deflection from ventricular depolarization
  • R wave – first positive deflection from ventricular depolarization
  • S wave – first negative deflection following the R
normal waves con td
Normal Waves Con’td
  • R’ wave – second positive deflection
  • S’ wave – second negative deflection following R
  • T wave – ventricular repolarization
p wave characteristics
P Wave Characteristics
  • Duration is < 0.12 seconds
  • Amplitude is < 4 mm
  • Contour is normally gently rounded, not notched or peaked
  • Normally upright in I, II, aVF
  • Inverted in aVR
qrs characteristics
QRS Characteristics
  • Normal duration is < 0.11 seconds
  • Amplitude (R or S wave) is > 5 mm and < 30 mm
  • Dominantly positive in I, II, aVF
  • Dominantly negative in aVR
t wave characteristics
T Wave Characteristics
  • Same polarity as dominant wave of QRS
  • Positive in I, II, aVF
  • Inverted in aVR
  • Asymmetrical, ascending more slowly than descending
segments and intervals of the ekg
Segments and Intervals of the EKG
  • P-R Interval
    • From beginning of P to beginning of QRS
    • Measures time taken by impulse to travel from SA node to ventricular fibers
    • Normal duration 0.12-0.20 seconds
  • ST Segment
    • From end of QRS to beginning of T
    • Should be isoelectric (on baseline)