Crystalloid Solutions
A crystalloid solution contains small particles that are composed of low molecular weight solutes lt 30 000 D that can be either ionic e.g. Na , CT or non-ionic e.g. glucose, mannitol . Crystalloid fluids are inexpensive compared with blood products and artificial colloids. The contents of a number of commonly used crystalloids are listed in Table 11.1. The systemic distribution of crystalloids is dependent on the amount of sodium in the solution. Solutions that contain approximately isotonic...
References Fkp
Atkins, P 1978 . Physical Chemistry. W. H. Freeman and Co., San Francisco. Baxley, P T. and Hellums, J. D. 1983 . A simple model for simulation of oxygen transport in the microcirculation. Ann. Biomed. Eng., 11, 401-416. Bjorkholm, M., Fagrell, B., Przybelski, R. et al. 2005 . A phase I single blind clinical trial of a new oxygen transport agent MP4 , human hemoglobin modified with maleimide-activated polyethylene glycol. Haematologia, in press. 90, 505-15 Chatterjee, R., Welty, E. V., Walder,...
The Optimal Hematocrit
What is the 'optimal' hematocrit Obviously, there is no simple answer to this question and certainly none that would apply to all patients. Because it is easily measured, hematocrit is frequently taken as a surrogate for oxygen transport capa-bility.The bulk viscosity of blood increases exponentially with hematocrit, and increased viscosity raises resistance to blood flow, limiting cardiac output in the absence of compensatory mechanisms. As the oxygen capacity of the blood hemoglobin or...
References Mla
Bentley, T. B., Tabaku, L. S., Handrigan, M. T. et al. 2003 . Prolonged permissive hypotensive resuscitation in an awake rat model of hemorrhagic shock. Fed. Am. Soc. Exper. Biol. J., 17, A806.18. Bickell, W. H., Matthew, J., Wall, M. J. Jr et al. 1994 . Immediate versus delayed fluid resuscitation for hypotensive patients with penetrating torso injuries. N. Engl. J. Med., 331, 1105-1109. Brauer, K. I., Prough, D. S., Traber, D. L. et al. 1999a . Large volume infusion of lactated Ringer's LR...
The Hemoglobin Oxygen Equilibrium Curve
Autoregulation of the oxygen supply insures that the organism adapts to moderate changes Figure 7.2 Arteriolar diameter in conditions of hypoxia, normoxia and hyperoxia caused by changing the composition of inspired gases or FiO2. Changes from normal air inspiration determine significant changes in tissue perfusion as the microcirculation strives to regulate oxygen delivery. in blood properties, and therefore the efficacy of a blood substitute cannot be determined unequivocally unless it is...
References 1
Adair, G. 1925 . The osmotic pressure of hemoglobin in the absence of salts. Proc. R. Soc. London, Series A, 109, 292-300. Amberson, W. 1937 . Blood substitutes. Biol. Rev., 12, 48-86. Bayliss, W. 1920 . Is haemolysed blood toxic Br. J. Exp. Pathol., 1,1-8. Benesch, R. and Benesch, R. 1967 . The effect of organic phosphates from the human erythrocyte on the allosteric properties of hemoglobin. Biochem. Biophys. Res. Comm., 26,162-167. Benesch, R., Benesch, R., Renthal, R. and Maeda, N. 1972 ....
Summary Crw
Oxygen transport by hemoglobin, either packaged inside red blood cells or in a cell-free solution, is ruled by physical laws of molecular transport. Molecular diffusion provides a fundamental differentiation between how oxygen is transported physically by cellular versus acellular oxygen carriers or by different types of cell-free oxygen carriers. Red blood cells and intracellular hemoglobin have evolved to carry sufficient oxygen from the lungs to offload to respiring tissue. The system acts...
Requirements For Combat Casualty Care
In US trauma centers, large volumes of crystalloids, particularly lactated Ringer's solution RL , are used for resuscitation of hemorrhage. Since each liter of RL only expands blood volume by 20-30 per cent of infused volume, several liters 3-5 liters infused to replace 1 liter bled of fluid are required to restore near normal blood volume after a major hemorrhage Lamke and Liljedahl, 1976 Drobin and Hahn, 1999 T0ll0fsrud et al., 2001 . Such volumes are logistically untenable for most combat...
Ringers solution
In 1883, Sydney Ringer discovered that the excised ventricle of the frog would beat for some hours if supplied with an aqueous solution of sodium, potassium and calcium salts. He found that the concentration of potassium and calcium was critical, whereas the amounts of the anions had little effect on the frog heart. The composition of 'Ringer's' solution Table 1.2 was shown many years later to be very close to that of frog plasma. Probably the most popular crystalloid salt solution for...
Tissue Respiration
Tissue PO2 is generally assumed to be representative of the level of oxygen supply to the tissue, and Figure 7.4 Tissue PO2 in extreme hemodilution with PEG conjugated hemoglobins with different cooperativity. Comparison with dextran 70 kDa. P5K2-Hb, two 5-kDa polyethylene glycol polymers per Hb molecule P10K2-Hb, two 10-kDa PEGs. MP4 Mal-PEG-Hb, Sangart Inc., San Diego Cabrales et al., 2004b . All determinations were carried out at hematocrit 11 per cent and plasma hemoglobin 1.1 g dl....
Traumaresuscitation
One of the most obvious clinical applications for hemoglobin-based red cell substitutes is in emergencies such as trauma. Among the factors that determine the long-term survival after resuscitation from hypovolemic shock is the duration of the shock state Baker et al., 1985 . Messmer and his colleagues Messmer, 1988 have conducted extensive studies of the microcirculation in shock, and have pointed out that under the influence of the sympathetic nervous system organ flow is redirected to...
Thomas C Page PhD and J David Hellums PhD
Department of Bioengineering, Rice University, Houston, Texas, USA Delivery of oxygen to tissue in capillaries is very different in suspensions of red blood cells mixed with extracellular hemoglobin-based oxygen carriers HBOCs than in unaltered blood. Put simply, HBOCs are not blood. One important way to investigate these differences is by the use of artificial capillaries. Such materials are free of biological regulatory mechanisms, and accurate determinations can be made of all parameters...
References Tby
Babineau, T, Dzik, W., Borlase, B. et al. 1992 . Reevaluation of current transfusion practices in patients in surgical intensive care units. Am. J. Surg., 164, 22-25. Baele, P L., DeBruyere, M., Deneys, V. et al. 1994 . The SANGUIS study in Belgium an overview. Acta Chir. Belg., 94, 69-74. Biro, G., Anderson, P, Curtis, S. and Cain, S. 1991 . Stroma-free hemoglobin its presence in plasma does not improve oxygen supply to the resting hindlimb vascular bed of hemodiluted dogs. Can. J. Physiol....
References Blo
AABB 2002 . National Blood Collection and Utilization Study. AABB Press. Allen, J. G., Dawson, D., Sayman, W. A. et al. 1959 . Blood transfusions and serum hepatitis use of monochloroacetate as an antibacterial agent in plasma. Ann. Surg., 150, 455-458. American Society of Anesthesiologists 1996 . Practice guidelines for blood component therapy a report by the American Society of Anesthesiologists Task Force on Blood Component Therapy. Anesthesiology, 84 3 , 732-747. Amin, M., Fergusson, D.,...
Perfluorocarbons
In 1966, Leland Clark and Frank Gollan demonstrated dramatically that a laboratory mouse Figure 1.2 Liquid-breathing mouse. The mouse is totally immersed in perfluorocarbon FC-80, butyltetrahydrofuran which has been saturated with oxygen by bubbling at room temperature. Such a mouse can survive liquid breathing for many hours From Clark, 1985 . Figure 1.2 Liquid-breathing mouse. The mouse is totally immersed in perfluorocarbon FC-80, butyltetrahydrofuran which has been saturated with oxygen by...
List of Contributors
Seetharama A.Acharya 39 , Albert Einstein Univ. School of Medicine, 1300 Morris Park Avenue, Bronx, NY, USA Paul Aebersold 3 , Division of Blood Applications, Center for Biologies Evaluation and Research, FDA, Rockville, MD, USA Abdu I.Alayash 18 , Center for Biologics Evaluation and Research - NIH Campus, FDA, Bethesda, MD, USA Vibhu Awasthi 43 , University of Texas Health Science Center at San Antonio, San Antonio, TX, USA Andrew D. Baines 20 , Department of Laboratory Medicine and...