• Richa Verma, Zhishan Huang, Clifford S Deutschman, and Richard J Levy.
• Department of Anesthesiology, Maria Fareri Children's Hospital of Westchester Medical Center, New York Medical College, Valhalla, NY, USA.
• Crit. Care Med. 2009 Apr 1;37(4):1397-402.

ObjectiveImpaired mitochondrial function is a potential cause of sepsis-associated myocardial depression. Cytochrome oxidase (CcOX), the terminal oxidase of the electron transport chain, is inhibited in the septic heart. Caffeine increases CcOX activity by increasing cyclic adenosine monophosphate and protein kinase A activity. We hypothesized that caffeine will restore myocardial CcOX activity, increase cardiac function, and improve survival during sepsis.DesignProspective randomized controlled study.SettingUniversity hospital-based laboratory.SubjectsOne hundred twenty Sprague-Dawley male rats.InterventionsSprague-Dawley male rats underwent cecal ligation and puncture (CLP) or sham operation. At 24 and 48 hours, rats underwent intraperitoneal injection of either caffeine (7.5 mg/kg, the equivalent of 1-1.5 cups of coffee) or equal volume of saline.Measurements And Main ResultsOne hour following the 48-hour injection, steady-state CcOX kinetic activity was measured in isolated mitochondria and normalized to citrate synthase activity. Cardiac function was assessed using an isolated rat heart preparation and survival was tracked to 96 hours. CLP significantly decreased myocardial CcOX activity, oxygen consumption, left ventricular pressure, and pressure developed during isovolumic contraction (+dP/dt) and relaxation (-dP/dt). Caffeine restored CcOX activity and increased left ventricular pressure and +/-dP/dt toward sham values following CLP. Survival significantly improved following CLP in caffeine-injected animals compared with saline injection.ConclusionCaffeine may be a novel therapy to treat sepsis-associated myocardial depression.

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