Prolonged Q-Tc interval and decreased lymphocyte magnesium in congestive heart failure

Magnesium. 1984;3(3):164-8.


Lymphocyte Mg concentration was measured in 2 patients with congestive heart failure, on long-term diuretic treatment, and was found to be lower than normal. The patients exhibited prolonged Q-Tc intervals on ECG analysis. During treatment with Mg sulfate, the Q-Tc interval normalized as the lymphocyte Mg approached control values. An Mg-sparing diuretic was added to the therapeutic regimen.

Publication types

  • Case Reports

MeSH terms

  • Aged
  • Electrocardiography
  • Heart / physiopathology*
  • Heart Failure / blood*
  • Heart Failure / physiopathology
  • Humans
  • Lymphocytes / metabolism*
  • Magnesium / metabolism*
  • Male
  • Potassium / blood


  • Magnesium
  • Potassium