Electrolyte Disorders ECG

 

Dyskaliémies:

Hypokalemia (<3.5 meq / l):

* Increased wave U (nonspecific sign)

* Flattening and negativity of the T wave (T + U draws a lying S)

* ST cupuliforme Depression

Hyperkalemia

Hyperkalemia

Hyperkalemia:

* Wave symmetrical and sharp T, narrow base, tent (serum potassium of 5.5 to 6.4 meq)

* The T waves are diffuse and high amplitude; with increasing P and PR and QRS widening moderate (serum potassium levels between 6.5 and 7.4)

* Serum potassium between 6.5 and 8.5 -> conduction disorders dominate:

– Disappearance of P, slow and irregular ventricular rhythm

– Major Widening of QRS (> 0,12s); T wave blunted

– Pseudo-infarct aspects (transient Q waves or eclipses ST segment elevation)

* Serum potassium> 8.5 meq -> excitability disorders dominate: TV; FV

Other:

Dyscalcemia:

Hypocalcemia:

The QT prolongation (by lengthening ST)

Hypercalcemia:

QT shortening

Dysmagnésémie:

Hypomagnesemia is associated hypokalemia and looks as hypermagnesaemia and hyperkalemia

Hypomagnesemia => QT space

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