Naunyn-Schmiedeberg's Archives of Pharmacology

, Volume 359, Issue 3, pp 204–211

Atrial fibrillation after coronary artery bypass surgery: association with changes in G protein levels in mononuclear leukocytes

  • V. Tittelbach
  • M. Schwab
  • J.-N. Volff
  • K. Mörike
  • P. Lemke
  • J. Giray
  • P. Lee
  • D. Ratge
  • K. Hellberg
  • H. Wisser
Original article

DOI: 10.1007/PL00005343

Cite this article as:
Tittelbach, V., Schwab, M., Volff, JN. et al. Naunyn-Schmiedeberg's Arch Pharmacol (1999) 359: 204. doi:10.1007/PL00005343

Abstract

Atrial fibrillation (AFib) is a frequent complication of coronary artery bypass grafting (CABG). Its cause, however, is unknown. As the adrenergic system is involved in some types of AFib, we hypothesized that a change in guanine nucleotide-binding protein (G protein) expression plays a role in the development of post-CABG AFib. In 28 patients undergoing CABG surgery, the G/Gratio (stimulatory/inhibitory G protein α) at the protein (Western blotting) and mRNA (reverse transcription polymerase chain reaction) levels was measured before and after surgery. As a suitable test system allowing multiple analysis mononuclear leukocytes (MNL) were chosen. The perioperative change of the G/Gratio of protein and mRNA was significantly different in patients who subsequently developed AFib (eight patients) and in patients who did not (20 patients; P<0.01 and <0.001, respectively). On average, the protein G/Gratio decreased from 1.79±1.13 (mean±SD) to 1.32±0.69 in patients without AFib (P=0.1, n.s.) whereas a significant increase from 0.86±0.44 to 1.62±0.65 (P<0.01) was observed in patients subsequently developing AFib. The mRNA G/Gratio decreased significantly from 0.53±0.24 to 0.36±0.11 in patients without AFib (P<0.01) whereas a significant increase from 0.31±0.14 to 0.47±0.13 was observed in those who subsequently developed AFib (P<0.05). These results indicate that an increase of the G/Gratio in MNL is associated with AFib after CABG surgery and possibly may be used as a prognostic indicator of this complication.

Key words G proteinsAtrial fibrillationCoronary artery bypass grafting

Copyright information

© Springer-Verlag Berlin Heidelberg 1999

Authors and Affiliations

  • V. Tittelbach
    • 1
  • M. Schwab
    • 3
  • J.-N. Volff
    • 1
  • K. Mörike
    • 3
  • P. Lemke
    • 2
  • J. Giray
    • 1
  • P. Lee
    • 2
  • D. Ratge
    • 1
  • K. Hellberg
    • 2
  • H. Wisser
    • 1
  1. 1.Department of Clinical Pathology, Robert Bosch Krankenhaus, Stuttgart, GermanyDE
  2. 2.Department of Thoracic and Vascular Surgery, Robert Bosch Krankenhaus, Stuttgart, GermanyDE
  3. 3.Dr. Margarete Fischer-Bosch-Institut für Klinische Pharmakologie, Auerbachstrasse 112, D-70376 Stuttgart, Germany e-mail: klaus.moerike@ikp-stuttgart.de, Tel. +49-711-81013700, Fax: +49-711-859295DE