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Metoprolol and coronary artery bypass grafting surgery: does intraoperative metoprolol attenuate acute beta-adrenergic receptor desensitization during cardiac surgery?

Publication ,  Journal Article
Booth, JV; Ward, EE; Colgan, KC; Funk, BL; El-Moalem, H; Smith, MP; Milano, C; Smith, PK; Newman, MF; Schwinn, DA ...
Published in: Anesth Analg
May 2004

UNLABELLED: Cardiac surgery results in significant impairment of beta-adrenergic receptor (beta AR) function and is a cause of depressed myocardial function after surgery. We previously demonstrated that acute administration of beta AR blocker during cardiopulmonary bypass (CPB) in an animal model of coronary artery bypass grafting (CABG) surgery attenuates beta AR desensitization, whereas chronic oral beta-blockade therapy in patients undergoing CABG surgery does not prevent it. Therefore we hypothesized that acute administration of metoprolol during CABG surgery would prevent acute myocardial beta AR desensitization. A placebo-controlled initial phase (n = 72) was performed whereby patients were randomized to either metoprolol 10 mg or placebo immediately before CPB. Then a second dose-finding study was performed where patients received 20 mg (n = 20) or 30 mg (n = 20) of metoprolol. Hemodynamic monitoring, atrial membrane adenylyl cyclase activity, atrial beta AR density, and postoperative outcomes were measured. All groups showed similar decreases in isoproterenol-stimulated adenylyl cyclase activity (13%-24%). Cardiac output remained similar in all 4 groups throughout the intraoperative and postoperative period. In addition, patients receiving metoprolol 20 or 30 mg had less supraventricular arrhythmias 24 h postoperatively compared with patients receiving metoprolol 10 mg or placebo. Therefore, unlike our previous animal model of CABG surgery, metoprolol did not attenuate myocardial beta AR desensitization. IMPLICATIONS: We investigated whether IV metoprolol given during cardiac surgery attenuates myocardial beta-adrenergic receptor (beta AR) desensitization. Although metoprolol did not reduce beta AR desensitization, the incidence of supraventricular arrhythmias was reduced by 75% in patients receiving 20 mg or 30 mg metoprolol.

Duke Scholars

Published In

Anesth Analg

DOI

ISSN

0003-2999

Publication Date

May 2004

Volume

98

Issue

5

Start / End Page

1224 / 1231

Location

United States

Related Subject Headings

  • Tachycardia, Supraventricular
  • Receptors, Adrenergic, beta
  • Myocardium
  • Middle Aged
  • Metoprolol
  • Male
  • Intraoperative Period
  • Injections, Intravenous
  • Humans
  • Hemodynamics
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Booth, J. V., Ward, E. E., Colgan, K. C., Funk, B. L., El-Moalem, H., Smith, M. P., … Duke Heart Center Perioperative Desensitization Group, . (2004). Metoprolol and coronary artery bypass grafting surgery: does intraoperative metoprolol attenuate acute beta-adrenergic receptor desensitization during cardiac surgery? Anesth Analg, 98(5), 1224–1231. https://doi.org/10.1213/01.ane.0000112325.66981.03
Booth, John V., Erin E. Ward, Kelly C. Colgan, Bonita L. Funk, Habib El-Moalem, Michael P. Smith, Carmelo Milano, et al. “Metoprolol and coronary artery bypass grafting surgery: does intraoperative metoprolol attenuate acute beta-adrenergic receptor desensitization during cardiac surgery?Anesth Analg 98, no. 5 (May 2004): 1224–31. https://doi.org/10.1213/01.ane.0000112325.66981.03.
Booth, John V., et al. “Metoprolol and coronary artery bypass grafting surgery: does intraoperative metoprolol attenuate acute beta-adrenergic receptor desensitization during cardiac surgery?Anesth Analg, vol. 98, no. 5, May 2004, pp. 1224–31. Pubmed, doi:10.1213/01.ane.0000112325.66981.03.
Booth JV, Ward EE, Colgan KC, Funk BL, El-Moalem H, Smith MP, Milano C, Smith PK, Newman MF, Schwinn DA, Duke Heart Center Perioperative Desensitization Group. Metoprolol and coronary artery bypass grafting surgery: does intraoperative metoprolol attenuate acute beta-adrenergic receptor desensitization during cardiac surgery? Anesth Analg. 2004 May;98(5):1224–1231.

Published In

Anesth Analg

DOI

ISSN

0003-2999

Publication Date

May 2004

Volume

98

Issue

5

Start / End Page

1224 / 1231

Location

United States

Related Subject Headings

  • Tachycardia, Supraventricular
  • Receptors, Adrenergic, beta
  • Myocardium
  • Middle Aged
  • Metoprolol
  • Male
  • Intraoperative Period
  • Injections, Intravenous
  • Humans
  • Hemodynamics