Cardioprotection, attenuated systemic inflammation, and survival benefit of beta1-adrenoceptor blockade in severe sepsis in rats.

Abstract:

OBJECTIVE:To explore the hypothesis that beta-1 adrenoreceptor blockade may be protective through the attenuation of sympathetic hyperactivity and catecholaminergic inflammatory effects on cardiac and hepatic function. DESIGN:Prospective, randomized, controlled study. SETTING:Animal laboratory in a university medical center. SUBJECTS:Male adult Wistar rats. INTERVENTIONS:Peripheral beta1-adrenoceptor blockade through daily intraperitoneal injection (metoprolol, 100 mg x kg(-1); atenolol, 6 mg x kg(-1)) or central nervous system beta1-adrenoceptor blockade (intracerebroventricular metoprolol, 25 microg) to achieve approximately 20% heart rate reduction in rats for 2 days before or after the induction of lethal endotoxemia, cecal ligation and puncture, or fecal peritonitis. MEASUREMENTS AND MAIN RESULTS:Peripheral beta1-adrenoceptor blockade established for 2 days before lethal endotoxemia markedly improved survival in both metoprolol-treated (n = 16; log rank test, p = .002) and atenolol-treated (n = 15; p = .03) rats. Overall mortality in cecal ligation and puncture was similar between metoprolol (40%; n = 10) and saline (50%; n = 10) pretreatment (p = .56), but the median time to death was increased by 33 hrs in metoprolol-treated rats (p = .03). Metoprolol pretreatment reduced hepatic expression of proinflammatory cytokines and lowered plasma interleukin-6 (both p < .05). Myocardial protein expression of interleukin-18 and monocyte chemoattractant protein-1, key mediators of cardiac dysfunction in sepsis, were also reduced (p < .05). Peripheral beta1-adrenoceptor blockade commenced 6 hrs after lethal endotoxemia or fecal peritonitis did not improve survival. However, arterial blood pressure was preserved and left ventricular contractility restored similar to that found in nonseptic controls. Central nervous system beta1-adrenoceptor blockade (metoprolol) did not reduce plasma cytokines or mortality, despite enhancing parasympathetic tone. CONCLUSIONS:Peripheral beta1-adrenoceptor blockade offers anti-inflammatory and cardioprotective effects, with mortality reduction if commenced before a septic insult. Its role in sepsis should be explored further.

journal_name

Crit Care Med

journal_title

Critical care medicine

authors

Ackland GL,Yao ST,Rudiger A,Dyson A,Stidwill R,Poputnikov D,Singer M,Gourine AV

doi

10.1097/CCM.0b013e3181c03dfa

subject

Has Abstract

pub_date

2010-02-01 00:00:00

pages

388-94

issue

2

eissn

0090-3493

issn

1530-0293

journal_volume

38

pub_type

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