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ST Segment Elevation cont'' Other Causes

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Ventricular Aneurysm. Hyperkalemia. Early Depolarization. Current of Injury- Inability to maintain a normal resting potential. ... – PowerPoint PPT presentation

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Title: ST Segment Elevation cont'' Other Causes


1
ST Segment Elevation cont..Other Causes
  • Coronary vasospasm
  • Acute Pericarditis
  • Ventricular Aneurysm
  • Hyperkalemia
  • Early Depolarization
  • Current of Injury- Inability to maintain a normal
    resting potential. Resting membrane drops from
    90 to 70. Outside of injured cell is more
    negative, compared to a normal cell, because of
    leakage of ions resulting in a abnormal
    baseline.Gives appearance of ST Elevation.

2
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3
ST Segment Depression
  • ST depression is an ECG sign of subendocardial
    ischemia and injury.
  • ST depression is gt 1 mm below the baseline,
    measured .04 second after the J point of the QRS.
  • ST depression appears within minutes after the
    onset of subendocardial non-Q-wave MI, during an
    anginal attack, or after exercise.
  • ST depression quickly reverts to normal after and
    anginal attack or after exercise as myocardial
    ischemia is corrected.

4
ST Segment Depression cont..Other causes
  • Left Right Ventricular Hypertrophy
  • Left Right Right Bundle Branch Blocks
  • Digitalis in Therapeutic and Toxic doses.

5
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6
Q wave
  • Normal result from the depolarization of the IS
    from left to right.
  • Abnormal Q waves are signs of irreversible
    myocardial necrosis in the evolution of an acute
    MI.
  • Considered abnormal if it is .04 second wide and
    depth of gt 25 of the height of the succeeding R
    wave.
  • Appear in about 2 hours or on the average of 8 to
    12 hours after the onset of the MI reaching max
    in about 24 to 48 hours.

7
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8
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9
Complications of Acute MI
  • Myocardial Dysfunction secondary to myocardial
    damage resulting in right left ventricular
    failure.
  • The disruption of the electrical conduction
    system, resulting in various arrhythmias.

10
THE ENDOFCHAPTER 15
  • Hauszar Robert, Basic Dysrhythmias,
    Interpretation Management, Third Edition,
    Mosby, Inc. 2002, pp. 315-340.
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