Difference between revisions of "Electrolyte Disorders"

From ECGpedia
Jump to navigation Jump to search
m (Hyperkalemia)
Line 29: Line 29:
 
Image:KJcasu18-2.jpg|Consecutive ECGs of a patient with hyperkalemia. ECG2
 
Image:KJcasu18-2.jpg|Consecutive ECGs of a patient with hyperkalemia. ECG2
 
Image:KJcasu18-1.jpg|Consecutive ECGs of a patient with hyperkalemia. After correction of potassium levels. ECG3
 
Image:KJcasu18-1.jpg|Consecutive ECGs of a patient with hyperkalemia. After correction of potassium levels. ECG3
 +
File:DVA0578.jpg|Another patient, potassium of 9.5 mmol/L
 
</gallery>
 
</gallery>
 
{{clr}}
 
{{clr}}

Revision as of 19:26, 19 May 2010

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

Hypercalcemia

Hypercalcemia, high blood calcium, speeds 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, low blood calcium:

  • 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, high blood potassium:

  • 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, low blood potassium, results in:

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