• Asger Granfeldt, Torben K Nielsen, Christoffer Sølling, Janus A Hyldebrandt, Jørgen Frøkiær, Lise Wogensen, Geoffrey P Dobson, Jakob Vinten-Johansen, and Else Tønnesen.
• Department of Anesthesiology, Aarhus University Hospital, Aarhus, Denmark. granfeldt@gmail.com
• Crit. Care Med.. 2012 Nov 1;40(11):3013-25.

ObjectivesHypotensive resuscitation is gaining clinical acceptance in the treatment of hemorrhagic shock. Our aims were to investigate: 1) the effect of 7.5% NaCl with adenocaine (adenosine and lidocaine, AL) and AL with Mg (ALM) on fluid requirement to maintain a minimum mean arterial pressure of 50 mm Hg, and 2) the effect of a second bolus of 0.9% NaCl with AL during return of shed blood on cardiac and renal function in a porcine model of hemorrhagic shock.DesignPigs were randomized to: Sham (n = 5), Sham + ALM/AL (n = 5), hemorrhage control (n = 11), or hemorrhage + ALM/AL (n = 9). Hemorrhage animals were bled to a mean arterial pressure of 35 mm Hg. After 90 mins, pigs were fluid resuscitated with Ringers acetate and 20 mL 7.5% NaCl with ALM to maintain a target mean arterial pressure of minimum 50 mm Hg. Shed blood and 0.9% NaCl with AL were infused 30 mins later. Hemorrhage control group was subjected to the same protocol but without ALM/AL. Hemodynamics, cardiodynamics (pressure-volume analysis), oxygen consumption, and kidney function were measured for 6 hrs.SettingUniversity hospital laboratory.SubjectsFemale farm-bred pigs.ResultsFluid volume infused during hypotensive resuscitation was 40% less in the 7.5% NaCl-/ALM-treated pigs than controls (25 vs. 41 mL/kg, p < .05). ALM was associated with a significant increase in dp/dtmax, end-systolic blood pressure, and systemic vascular resistance. Return of shed blood and 0.9% NaCl/AL reduced whole body oxygen consumption by 27% (p < .05), and significantly improved the end-systolic pressure-volume relationship and preload recruitable stroke work compared to controls. Glomerular filtration rate in the ALM/AL group returned to 83% of baseline compared to 54% in controls (p = .01).ConclusionResuscitation with 7.5% NaCl ALM increases cardiac function and reduces fluid requirements during hypotensive resuscitation, whereas a second AL infusion during blood resuscitation transiently reduces whole body oxygen consumption and improves cardiac and renal function.

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