KIN 494: normal findings

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skerwien
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33205
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KIN 494: normal findings
Updated:
2010-09-07 12:34:54
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  1. Normal findings of a Pwave?
    • Duration: 0.10 sec
    • Amplitude: 0.5 and 2.5 mm
    • Upright: I, II, avF, V4, V5, V6
    • Inverted: aVR
    • Variable: III, avL, V1, V2, V3
  2. Abnormal findings of a Pwave?
    • M shaped or notched P Wave
    • M-Mitral: Left atrial enlargement
    • Peaked P Wave (over .11 sec)
    • Right atrial enlargement atrial dilatation
    • P Waves absent
    • Sinoatrial node block
    • AV Nodal rhythm
  3. Normal PR Interval?
    • Duration: 0.12 to 0.20 sec
    • Prolonged PR interval (> .20)
    • AV Node Block
    • Shortened PR interval (< .12, accelerated)
    • Wolf-Parkinson-White Syndrome (WPW
    • syndrome)
    • PR segment: normally isoelectric (not
    • measured)
  4. Normal Q wave?
    • Duration: 0.04 sec (1 small boxes)
    • Amplitude: < 25% of amplitude of R wave in that lead
    • Always the first negative deflection below baseline
    • Variable: III, aVR
    • may not always have one
  5. normal RS Wave?
    Negative waveform (below baseline) following R

    Depolarization of right and left ventricle
  6. normal QRS complex?
    • Duration: Limb leads (I, II, III): ≤ 0.10
    • Prolonged QRS complex (> 0.12)
    • High QRS amplitude
    • Evaluate for Left Ventricular Hypertrophy (LVH)
    • Upright I, aVL, V5, V6 and II, III, and aVF
  7. normal J point?
    • Point at the end of the QRS complex and the beginning of the ST segment
    • should be aligned with beginning of Q wave to be normal
  8. normal ST segment?
    • a little down or up slope is fine
    • ST segment is isoelectric
    • Early part of repolarization of the ventricles
    • PR segment is used as baseline for identification of deviation from baseline
    • Measure 2 small box (0.08 sec) from J
    • point
    • Elevation or Depression with 2 small box
    • above or below in multiple leads
  9. Normal T wave?
    Smooth and asymetrical

    • Amplitude : <5 mm
    • Upright: I, II, V3, V4, V5, V6
    • Tall T Waves: Myocardial infarction, Myocardial ischemia, Cerebrovascular accident

    goes hand in hand with the QRS complex
  10. normal QT interval?
    • Normal QT decreases with increasing heart rate
    • Calculation of QTc or corrected QT (Bazett's Formula)
    • QTc = QT/(sqrt RR Interval)
    • QTc is normally <0.44

    a long interval could be for an athlete or someone with hypertension
  11. What is the large box method?
    • its is a close estimate
    • count the number of large boxes (5mm) between beats
    • divide by 300 (=1 minute)
  12. small box method?
    • count number of small boxes (1mm) between beats
    • divide by 1500 ( =1minute)

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