Electrolyte Disorders: Difference between revisions

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==Hypokalemia==
==Hypokalemia==
Hypokalemia is a low blood potassium level. This results in:
*ST depression and flattening of the T wave
*Negative T waves
*A U-wave may be visible
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Image:KJcasu17-1.jpg| patient A
Image:KJcasu17-1.jpg| patient A
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Image:KJcasu17-3.jpg| patient B
Image:KJcasu17-3.jpg| patient B
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Hypokalemia is a low blood potassium level. This results in:
*ST depression and flattening of the T wave
*Negative T waves
*A U-wave may be visible
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Revision as of 16:34, 28 April 2008

Author(s) J.S.S.G. de Jong
Moderator T.T. Keller
Supervisor
some notes about authorship

Hypercalcemia

Hypercalcemia results in a faster repolarization. Characteristics of hypercalcemia:

  • mild: broad based tall peaking T waves
  • severe: extremely wide QRS, low R wave, disappearance of p waves, tall peaking T waves.

Hypocalcemia

ECG-characteristics of hypocalcemia:

  • narrowing of the QRS complex
  • reduced PR interval
  • T wave flattening and inversion
  • prolongation of the QT-interval
  • prominent U-wave
  • prolonged ST and ST-depression

Hyperkalemia

ECG characteristics of hyperkalemia:

  • Tall peaked T waves
  • Flattening p-waves. In extreme hyperkalemia p-waves may disappear altogether.
  • Prolonged depolarization leading to QRS widening (nonspecific intraventricular conduction defect) sometimes > 0.20 seconds

At concentrations > 7.5 mmol/L atrial and ventricular fibrillation can occur.


Hypokalemia

Hypokalemia is a low blood potassium level. This results in:

  • ST depression and flattening of the T wave
  • Negative T waves
  • A U-wave may be visible