Clinical death and the measurement of stressed vascular volume

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ObjectivesTo measure stressed vascular volume in humans and to review the concepts of stressed and unstressed vascular volume.DesignObservational study during surgical procedure.SettingOperating room at a university hospital.PatientsFive patients undergoing hypothermic circulatory arrest for surgery on major vessels.InterventionWe measured the volume that drained from the patient to the reservoir of the pump when the pump was turned off.Measurements and Main ResultsStressed volume was 20.2 +/- 1.0 mL/kg, which is 30% of the predicted blood volume of these patients.ConclusionThe amount of blood volume that determines vascular filling pressure is only about a quarter of the total predicted volume, which means that there is a large reserve of unstressed volume that can be recruited to maintain vascular filling pressure. (Crit Care Med 1998; 26:1061-1064)

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