Abstract
Blood transfusions are a relatively common event in patients with sepsis. Although severe anemia is associated with worse outcomes, hemoglobin levels less than the classically quoted 10 g/dl are well tolerated in many patients, and it is difficult to determine whether or when such patients should be transfused. Importantly, there can be no one transfusion trigger or threshold for all patients, rather the benefit/risk ratio of transfusion should be assessed in each patient taking into account multiple factors including physiological variables, age, disease severity, and coexisting cardiac ischemia. The ultimate goal of transfusion is to improve tissue oxygenation, but our ability to measure these changes and hence determine the need for and response to transfusion is still limited.
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Keywords
- Oxygen Extraction
- Blood Lactate Level
- Functional Capillary Density
- Transfusion Strategy
- Increase Blood Viscosity
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
3.1 Introduction
Patients with sepsis make up a large proportion of the intensive care unit (ICU) population, and although outcomes have improved over the last decade [1], these patients, particularly those with septic shock, still have mortality rates in the region of 20–30 % [2, 3]. There are no effective specific antisepsis treatments, and management of patients with sepsis thus relies largely on early recognition allowing timely administration of appropriate antibiotics, suitable source control measures, and effective resuscitation strategies. The aims of resuscitation are essentially to restore and maintain tissue oxygen delivery (DO2) so that organs can function optimally.
There are various means by which DO2 can be improved, including fluid administration, vasopressor agents to restore perfusion pressure, and inotropic agents to support cardiac function and increase cardiac output. Blood transfusions have also been widely used as a means of improving tissue DO2, although this relationship is not straightforward. Indeed, the increased blood viscosity as a result of the transfusion can lead to a decrease in cardiac output (CO) and hence in DO2 [4], except in conditions of hemorrhage and hemodilution in which increased viscosity can improve microcirculatory flow and hence DO2 [5]. As many as 30 % of intensive care unit (ICU) patients receive a transfusion at some point during their ICU stay [6–11], but there is still considerable debate about the benefit/risk ratio of this intervention and when or if any individual patient should be transfused.
In this chapter, we will review the balance between DO2 and oxygen uptake (VO2) in sepsis and the effects of red blood cell transfusion on this balance and discuss some of the more recent trials that have investigated hemoglobin levels and the beneficial and adverse effects of transfusion in critically ill patients.
3.2 Oxygen Delivery and Consumption in Sepsis
Tissue oxygenation essentially relies on DO2, VO2, and the ability of the tissue to extract oxygen. DO2 is the rate at which oxygen is transported from the lungs to the tissues and is the product of the CO and the arterial oxygen content (CaO2): DO2 = CO × CaO2, where CaO2 = hemoglobin concentration (Hb) × arterial oxygen saturation (SaO2) × 1.34 (the oxygen carrying capacity of Hb). DO2 can, therefore, be influenced by changes in CO, hemoglobin concentration, and oxygen saturation. VO2 is the amount of oxygen removed from the blood by the tissues per minute and is the product of the CO and the difference between CaO2 and mixed venous oxygen content (CvO2): VO2 = CO × (CaO2 − CvO2). VO2 is determined by the metabolic rate of the tissues, which increases during physical activity, hyperthermia, shivering, etc. The ratio of the oxygen consumed to that delivered (VO2/DO2) represents the amount of oxygen extracted by the tissues, the oxygen extraction ratio (O2ER).
As tissues are unable to store oxygen, it is important for them to have a system by which delivery of oxygen can be adjusted efficiently to oxygen demands. Under normal physiological conditions, as DO2 decreases, oxygen extraction increases to compensate and maintain VO2, ensuring adequate tissue oxygenation for aerobic metabolism and normal cellular function: VO2 is independent of DO2. Indeed, at rest, VO2 is only about 25 % of DO2, so that there is a large reserve of oxygen available for extraction if needed as DO2 falls [12]. However, a point is reached at which oxygen extraction is unable to increase further and a so-called critical DO2 is attained at which VO2 becomes dependent on DO2; any further decrease in DO2 is associated with a decrease in VO2 and anaerobic metabolism with a rise in blood lactate levels [13–15].
During septic shock, the ability of tissues to extract oxygen is reduced so that this VO2/DO2 relationship can be altered with the critical DO2 set at higher values such that VO2 is dependent on DO2 over a larger range of values [13–15]. The reasons for the reduced oxygen extraction abilities in sepsis have not been fully elucidated but are likely to be related in part to the microcirculatory changes seen in sepsis, including increased heterogeneity, increased stop-flow capillaries, and increased shunting of DO2 from arterioles to venules [12]. Impaired ability of mitochondria to use the available oxygen may also play a role in microcirculatory dysoxia [16].
3.3 Anemia in Sepsis
Anemia, widely defined in ICU studies as a hemoglobin level <12 g/dl [7, 17], is common in critically ill patients [6, 7, 18]. In the ABC study [3], 29 % of patients had a hemoglobin concentration <10 g/dl on admission. In a Scottish cohort, 25 % of patients had a hemoglobin concentration <9 g/dl on ICU admission [19]. Hemoglobin concentrations decrease during the ICU stay, particularly in septic patients, in whom Nguyen et al. [20] reported a decrease of 0.68 ± 0.66 g/dl/day; this study also noted that hemoglobin concentrations continued to decrease after the third day in patients with sepsis but not in those without [20].
Multiple factors act together to cause anemia in the critically ill patient, including primary blood losses (trauma, surgery, gastrointestinal bleeding, etc.), phlebotomy losses, which can reach as much as 40 ml/day [20], hemodilution secondary to fluid resuscitation, blunted erythropoietin (EPO) production, abnormalities in iron metabolism, and altered red blood cell production and maturation [21–23]. In healthy subjects, compensatory mechanisms, including the increased oxygen extraction discussed above, but also reflex increases in CO because of decreased blood viscosity, increased adrenergic response, causing tachycardia and increased myocardial contractility, and blood flow redistribution (to heart and brain) enable severe anemia to be tolerated [24]. However, in critically ill patients, compensatory mechanisms are less efficient, and oxygen reserves are reduced so that lesser degrees of anemia may have greater consequences on organ function and outcome. Oddo et al., in a retrospective study of patients with traumatic brain injury who had had brain tissue oxygen tension (PbtO2) measured, noted that anemia associated with reduced PbtO2 was a risk factor for unfavorable outcome, but not anemia alone [25]. Patients with myocardial ischemic disease may be particularly sensitive to the effects of anemia because the associated tachycardia and increased contractility may increase myocardial oxygen demand, which will need to be met by increased coronary blood flow as myocardial oxygen extraction is almost maximal already at rest [23, 26].
3.4 Monitoring VO2/DO2 and Tissue Oxygenation During Transfusion
Because DO2 is the product of CO and CaO2 is determined in part by the hemoglobin concentration, when the hemoglobin concentration decreases, DO2 will decrease (if CO remains unchanged). Hence, one may anticipate that increasing the hemoglobin by giving a transfusion would help increase DO2 as has indeed been shown in several studies [27–29]; although by increasing blood viscosity, some of the compensatory mechanisms of acute anemia on left ventricular pre- and afterload will be reduced, thus limiting the effects on DO2 [5]. Moreover, even if DO2 does increase, there is no guarantee that VO2 and hence oxygen availability to the tissues will also increase, particularly in patients with an abnormal VO2/DO2 relationship and an altered microcirculation, such as those with sepsis [27, 29, 30]. There are several possible reasons for this including the fact that the ability of hemoglobin to download oxygen may be altered in sepsis because of microcirculatory changes, such as altered red blood cell deformability, altered oxygen extraction capabilities, reduced functional capillary density, and increased heterogeneity of flow. The ability of hemoglobin to deliver oxygen may also be influenced by changes that occur during storage of blood [31] and by increased blood viscosity following transfusion leading to reduced microcirculatory flow. Additionally, tissue oxygen demands are increased in patients with sepsis.
Importantly, different tissues have different critical DO2 values and VO2/DO2 relationships and develop hypoxia at different degrees of acute anemia [32]. Hence, global assessment of the VO2/DO2 relationship cannot be used to guide therapy. “Coupling of data,” which occurs when both variables have been calculated from the same values, is also a problem when using this relationship [15]. Cardiac output represents total body blood flow and can be monitored almost continuously but offers no information on regional organ perfusion. Cardiac output is also highly variable among individuals and varies according to oxygen requirements; for example, in sepsis the typically “normal” or high CO seen may be insufficient because of increased sepsis-related tissue oxygen requirements.
Mixed venous oxygen saturation (SvO2) has been widely used as a marker of tissue oxygenation, and, indeed, as oxygen extraction increases to meet oxygen demands, SvO2 will decrease. However, although low SvO2 indicates poor tissue oxygenation, normal or high SvO2 values do not necessarily mean that tissue oxygenation is adequate; for example, if a tissue is unable to extract oxygen, the venous return from that area may still have a high oxygen content although the tissues may be hypoxic. Central venous oxygen saturation (ScvO2) is increasingly used as a less invasive surrogate for SvO2, but again this is a global measure. Rivers et al. [33], in their landmark study, randomized patients admitted to an emergency department with severe sepsis and septic shock to receive standard therapy (targeted at a central venous pressure [CVP] of 8–12 mmHg, mean arterial pressure [MAP] ≥65 mmHg, and urine output ≥0.5 ml/kg/h) or to the so-called early goal-directed therapy (EGDT) in which an ScvO2 of at least 70 % was also targeted by optimizing fluid administration, giving blood transfusions to maintain hematocrit ≥30 %, and/or giving dobutamine to a maximum of 20 μg/kg/min. The EGDT group received more fluids, and more were treated with dobutamine; the number of transfused patients was also greater than in the standard therapy group. Patients in the EGDT group had significantly lower mortality rates than other patients, and this study therefore seemed to support the use of ScvO2 values to guide therapy, including transfusions [33]. However, in the recently published Protocolized Care for Early Septic Shock (ProCESS) study [34], there were no significant differences in 90-day mortality, 1-year mortality, or the need for organ support in patients managed with protocolized EGDT – using a similar protocol to that used by Rivers et al., protocolized standard therapy or usual care.
The O2ER is easy to calculate, and plotting cardiac index (CI) against O2ER and relating them to isopleths of VO2 can help identify whether a patient has reached the point of VO2/DO2 dependency and evaluate the adequacy of CO in complex patients [35]. In patients with anemia and normal cardiac function, a CI/O2ER ratio <10 suggests an inadequate CI that is likely due to hypovolemia [35].
As tissue oxygenation becomes inadequate, anaerobic metabolism begins to take over from aerobic metabolism and blood lactate levels rise. Although other factors can also result in increased blood lactate levels [36], a blood lactate level greater than 2 mEq/l suggests inadequate tissue perfusion and oxygenation. Hyperlactatemia is associated with a poor prognosis in critically ill patients in general and in those with sepsis [37]. As with many other measures, trends in lactate levels are of greater value than any individual value [38].
There is no ideal measure for determining optimal tissue oxygenation, and adequacy of DO2 must be assessed using a combination of the above variables along with clinical examination.
3.5 Microcirculatory Effects of Blood Transfusions
With the advent of new techniques to monitor the microcirculation, several studies have now reported the effects of transfusion on the microcirculation in human subjects. In a small early study using orthogonal polarization spectral (OPS) imaging, Genzel-Boroviczény et al. reported an improvement in functional capillary density following transfusion in anemic preterm infants, indicating improved microvascular perfusion [39]. In patients undergoing on-pump cardiac surgery, Yuruk and colleagues [40] reported, using sidestream dark-field (SDF) imaging, that blood transfusion was associated with microcirculatory recruitment resulting in increased capillary density, thus reducing the oxygen diffusion distance to the cells. Using near-infrared spectroscopy (NIRS), the same authors reported that transfusion increased thenar and sublingual tissue oxygen saturation (StO2) and thenar and sublingual tissue hemoglobin index (THI) in outpatients with chronic anemia [41]. In critically ill patients, Creteur et al., using the same NIRS technique, noted that blood transfusion was not associated with changes in muscle tissue oxygenation, VO2, or microvascular reactivity in all patients, but that muscle VO2 and microvascular reactivity did improve in patients in whom these variables were altered prior to the transfusion [42]. Similar findings have been made in patients with severe sepsis [43, 44] and trauma [45]. In a retrospective study of patients with severe sepsis who had a microdialysis catheter inserted for interstitial fluid measurements, blood transfusion was associated with a decrease in the interstitial lactate/pyruvate ratio, and these changes were again correlated with the pre-transfusion lactate/pyruvate ratio [46].
Studies have also assessed the impact of transfusion of fresh versus stored blood cell units on the microcirculation. In healthy volunteers, there were no differences in sublingual OPS-derived microcirculatory variables or NIRS-derived StO2 after transfusion with 7-day or 42-day stored blood [47]. Walsh et al. reported no difference between stored (>20 days) and fresh (<5 days) cells on gastric tonometry indices in anemic critically ill patients [48], but Weinberg et al. reported a decrease in NIRS StO2 and sidestream dark-field (SDF) capillary vascular density with transfusion of older units in trauma patients [49]. Some of the negative effects of blood transfusion may be due to the presence of leukocytes, and it has been proposed that use of leukodepleted blood should be preferred in critically ill patients. A recent pilot study in which 20 patients with sepsis were randomized to receive either leukodepleted or non-leukodepleted blood showed no clear superiority of leukodepleted over non-leukodepleted blood although leukodepleted blood was associated with more favorable changes in MFI and blood flow velocity [50].
3.6 Putting the Theory into Practice: Clinical Trials of Transfusion Triggers in Septic Patients
We have seen that blood transfusion can improve DO2 but may not directly help improve tissue oxygenation. Patients with sepsis frequently develop anemia [20], which is known to be associated with worse outcomes in critically ill patients [11, 51, 52], but are blood transfusions actually of benefit? When should critically ill patients with sepsis be transfused? Several early observational studies suggested worse outcomes in critically ill patients who received a transfusion compared to those who did not [6, 7], casting doubt on the supposed benefits of transfusion, but more recent studies have suggested the opposite [8, 11]. Some of these differences may be related to the timing of transfusion as benefits are likely to be greatest in the early stages of disease than in later phases when patients are stable or already have established organ failure [53]. Indeed, the Surviving Sepsis Campaign guidelines give different recommendations based on the duration of the septic episode: during the first 6 h of resuscitation, they suggest that transfusion should be given to maintain the hematocrit above 30 % if ScvO2 remains below 70 % despite initial fluid and vasopressor therapy; this recommendation was, however, largely based on the Rivers study [33], so may need to be reconsidered in light of the ProCESS results [34]. After this initial period, the SSC guidelines recommend transfusion when the hemoglobin concentration is less than 7.0 g/dl to maintain a concentration of 7.0–9.0 g/dl (grade 1B). In certain circumstances, such as severe hypoxemia, ischemic coronary artery disease, or acute hemorrhage, higher thresholds may be warranted [54]. Guidelines from the British Committee for Standards in Hematology make similar recommendations [55].
The Transfusion Requirements in Critical Care (TRICC) study published in 1999 [56] changed many intensivists’ conceptions of blood transfusion, and physicians worldwide began to reconsider their transfusion thresholds [57], although one recent study suggested that transfusion rates only decreased in high-volume ICUs (>200 admissions per year) but continued to increase in low-volume hospitals [58]. Importantly, much has changed in intensive care since 1994–1997 when the TRICC study was conducted. Blood transfusion medicine has evolved so that blood transfusions are now safer. The general process of care has improved, and patients are being diagnosed and treated more rapidly with appropriate and effective resuscitation. So what new evidence is available on transfusion thresholds? There have been no large-scale studies comparing one transfusion trigger with another in a general population of critically ill patients since the TRICC study, and there are few specific data in septic patients. But there have been several studies comparing different thresholds in other groups of patients. A randomized controlled study in more than 500 patients undergoing cardiac surgery with cardiopulmonary bypass reported that a perioperative restrictive transfusion strategy (to maintain a hematocrit at least 24 %) was associated with similar morbidity/mortality outcomes compared to a more liberal strategy (to maintain a hematocrit of at least 30 %) [59]. In addition, regardless of the transfusion strategy, the number of transfused red blood cell units was an independent risk factor for clinical complications or death at 30 days (hazard ratio 1.21 for each additional unit transfused; 95 % confidence interval 1.1–1.4, P = .002). In a recent pilot study that included 100 elderly (>55 years), mechanically ventilated ICU patients, there was a trend to reduced mortality in patients managed using a restrictive (hemoglobin threshold 7.0 g/dl) compared to a more liberal (9.0 g/dl) strategy [60]. In a small randomized study in 44 patients with subarachnoid hemorrhage and high risk of vasospasm, Naidech et al. [61] reported that targeting a higher hemoglobin concentration (11.5 g/dl) was as safe as targeting a lower hemoglobin level (10 g/dl) and may have reduced the incidence of cortical cerebral infarction. In a randomized study of 2,016 patients ≥50 years of age with a history of or risk factors for cardiovascular disease after hip fracture surgery, a liberal transfusion strategy (hemoglobin threshold 10 g/dl) was not associated with reduced mortality or function at 60 days compared with a restrictive strategy (symptoms of anemia or physician discretion for a hemoglobin level of <8 g/dl) [62].
3.7 Conclusion
Anemia is common in the critically ill patient and is associated with worse outcomes. Nevertheless, most patients can tolerate a degree of anemia, and it is difficult to determine whether or when such patients should be transfused. Strategies to reduce the development of anemia should be employed, including minimizing iatrogenic blood loss and oxygen consumption. Exogenous erythropoietin, iron, and Hb-based oxygen carriers may have a place in some patients, but further study is needed to determine their role.
Microcirculatory “shunting” can create local hypoxia even if global oxygenation parameters are normal, and strategies that act directly on regional perfusion or cellular metabolism are likely to be more effective than strategies aimed at increasing global DO2. Transfusions seem to improve microcirculatory parameters in patients in whom these variables are altered prior to transfusion, and further study is needed to determine whether such variables could be used to guide transfusion. Current guidelines suggest targeting a hematocrit of >30 % in the early phase of sepsis [54], but this threshold should be assessed on an individual basis taking into account multiple factors including physiological variables, age, and coexisting cardiac ischemia [63, 64].
A study comparing a restrictive (at hemoglobin ≤7 g/dl) versus liberal (at hemoglobin ≤9 g/dl) transfusion protocol in patients with septic shock is currently ongoing (Transfusion Requirements in Septic Shock [TRISS] trial) [65] and may help provide additional guidance when considering transfusing patients with sepsis.
References
Kaukonen KM, Bailey M, Suzuki S, Pilcher D, Bellomo R. Mortality related to severe sepsis and septic shock among critically ill patients in Australia and New Zealand, 2000–2012. JAMA. 2014;311:1308–16.
Vincent JL, Marshall JC, Namendys-Silva SA, François B, Martin-Loeches I, Lipman J, Reinhart K, Antonelli M, Pickkers P, Njimi H, Jimenez E, Sakr Y. Assessment of the worldwide burden of critical illness: the Intensive Care Over Nations (ICON) audit. Lancet Respir Med. 2014;2:380–6.
Vincent JL, Rello J, Marshall J, Silva E, Anzueto A, Martin CD, Moreno R, Lipman J, Gomersall C, Sakr Y, Reinhart K. International study of the prevalence and outcomes of infection in intensive care units. JAMA. 2009;302:2323–9.
Martini J, Carpentier B, Negrete AC, Frangos JA, Intaglietta M. Paradoxical hypotension following increased hematocrit and blood viscosity. Am J Physiol Heart Circ Physiol. 2005;289:H2136–43.
Tsai AG, Hofmann A, Cabrales P, Intaglietta M. Perfusion vs. oxygen delivery in transfusion with “fresh” and “old” red blood cells: the experimental evidence. Transfus Apher Sci. 2010;43:69–78.
Vincent JL, Baron JF, Reinhart K, Gattinoni L, Thijs L, Webb A, Meier-Hellmann A, Nollet G, Peres-Bota D. Anemia and blood transfusion in critically ill patients. JAMA. 2002;288:1499–507.
Corwin HL, Gettinger A, Pearl RG, Fink MP, Levy MM, Abraham E, MacIntyre NR, Shabot MM, Duh MS, Shapiro MJ. The CRIT Study: Anemia and blood transfusion in the critically ill – current clinical practice in the United States. Crit Care Med. 2004;32:39–52.
Vincent JL, Sakr Y, Sprung C, Harboe S, Damas P. Are blood transfusions associated with greater mortality rates? Results of the Sepsis Occurrence in Acutely Ill Patients study. Anesthesiology. 2008;108:31–9.
Brophy DF, Harpe SE, Carl DE, Brophy GM. An epidemiological study of anemia and renal dysfunction in patients admitted to ICUs across the United States. Anemia. 2012;2012:938140.
Surgenor SD, Kramer RS, Olmstead EM, Ross CS, Sellke FW, Likosky DS, Marrin CA, Helm Jr RE, Leavitt BJ, Morton JR, Charlesworth DC, Clough RA, Hernandez F, Frumiento C, Benak A, DioData C, O’Connor GT. The association of perioperative red blood cell transfusions and decreased long-term survival after cardiac surgery. Anesth Analg. 2009;108:1741–6.
Sakr Y, Lobo S, Knuepfer S, Esser E, Bauer M, Settmacher U, Barz D, Reinhart K. Anemia and blood transfusion in a surgical intensive care unit. Crit Care. 2010;14:R92.
Kanoore Edul V, Dubin A, Ince C. The microcirculation as a therapeutic target in the treatment of sepsis and shock. Semin Respir Crit Care Med. 2011;32:558–68.
Squara P. Matching total body oxygen consumption and delivery: a crucial objective? Intensive Care Med. 2004;30:2170–9.
Vincent JL. DO2/VO2 relationships. In: Pinsky MR, Payen D, editors. Functional hemodynamic monitoring. Heidelberg: Springer; 2005. p. 251–8.
Leach RM, Treacher DF. The pulmonary physician in critical care * 2: oxygen delivery and consumption in the critically ill. Thorax. 2002;57:170–7.
Fink MP. Cytopathic hypoxia. Is oxygen use impaired in sepsis as a result of an acquired intrinsic derangement in cellular respiration? Crit Care Clin. 2002;18:165–75.
Hayden SJ, Albert TJ, Watkins TR, Swenson ER. Anemia in critical illness: insights into etiology, consequences, and management. Am J Respir Crit Care Med. 2012;185:1049–57.
Thomas J, Jensen L, Nahirniak S, Gibney RT. Anemia and blood transfusion practices in the critically ill: a prospective cohort review. Heart Lung. 2010;39:217–25.
Walsh TS, Lee RJ, Maciver CR, Garrioch M, MacKirdy F, Binning AR, Cole S, McClelland DB. Anemia during and at discharge from intensive care: the impact of restrictive blood transfusion practice. Intensive Care Med. 2006;32:100–9.
Nguyen BV, Bota DP, Melot C, Vincent JL. Time course of hemoglobin concentrations in nonbleeding intensive care unit patients. Crit Care Med. 2003;31:406–10.
Piagnerelli M, Zouaoui Boudjeltia K, Gulbis B, Vanhaeverbeek M, Vincent JL. Anemia in sepsis: the importance of red blood cell membrane changes. Transfus Altern Transfus Med. 2007;9:143–9.
Vincent JL, Sakr Y, Creteur J. Anemia in the intensive care unit. Can J Anaesth. 2003;50:S53–9.
Lelubre C, Vincent JL. Red blood cell transfusion in the critically ill patient. Ann Intensive Care. 2011;1:43.
Weiskopf RB, Viele MK, Feiner J, Kelley S, Lieberman J, Noorani M, Leung JM, Fisher DM, Murray WR, Toy P, Moore MA. Human cardiovascular and metabolic response to acute, severe isovolemic anemia. JAMA. 1998;279:217–21.
Oddo M, Levine JM, Kumar M, Iglesias K, Frangos S, Maloney-Wilensky E, Le Roux PD. Anemia and brain oxygen after severe traumatic brain injury. Intensive Care Med. 2012;38:1497–504.
Levy PS, Kim SJ, Eckel PK, Chavez R, Ismail EF, Gould SA, Ramez SM, Crystal GJ. Limit to cardiac compensation during acute isovolemic hemodilution: influence of coronary stenosis. Am J Physiol. 1993;265:H340–9.
Lorente JA, Landin L, De Pablo R, Renes E, Rodriguez-Diaz R, Liste D. Effects of blood transfusion on oxygen transport variables in severe sepsis. Crit Care Med. 1993;21:1312–8.
Casutt M, Seifert B, Pasch T, Schmid ER, Turina MI, Spahn DR. Factors influencing the individual effects of blood transfusions on oxygen delivery and oxygen consumption. Crit Care Med. 1999;27:2194–200.
Suttner S, Piper SN, Kumle B, Lang K, Rohm KD, Isgro F, Boldt J. The influence of allogeneic red blood cell transfusion compared with 100 % oxygen ventilation on systemic oxygen transport and skeletal muscle oxygen tension after cardiac surgery. Anesth Analg. 2004;99:2–11.
Fernandes Jr CJ, Akamine N, De Marco FV, De Souza JA, Lagudis S, Knobel E. Red blood cell transfusion does not increase oxygen consumption in critically ill septic patients. Crit Care. 2001;5:362–7.
Almac E, Ince C. The impact of storage on red cell function in blood transfusion. Best Pract Res Clin Anaesthesiol. 2007;21:195–208.
Lauscher P, Kertscho H, Schmidt O, Zimmermann R, Rosenberger P, Zacharowski K, Meier J. Determination of organ-specific anemia tolerance. Crit Care Med. 2013;41:1037–45.
Rivers E, Nguyen B, Havstad S, Ressler J, Muzzin A, Knoblich B, Peterson E, Tomlanovich M. Early goal-directed therapy in the treatment of severe sepsis and septic shock. N Engl J Med. 2001;345:1368–77.
The ProCESS Investigators. A randomized trial of protocol-based care for early septic shock. N Engl J Med. 2014;370:1683–93.
Yalavatti GS, DeBacker D, Vincent JL. Assessment of cardiac index in anemic patients. Chest. 2000;118:782–7.
De Backer D. Lactic acidosis. Minerva Anestesiol. 2003;69:281–4.
Mikkelsen ME, Miltiades AN, Gaieski DF, Goyal M, Fuchs BD, Shah CV, Bellamy SL, Christie JD. Serum lactate is associated with mortality in severe sepsis independent of organ failure and shock. Crit Care Med. 2009;37:1670–7.
Nichol A, Bailey M, Egi M, Pettila V, French C, Stachowski E, Reade MC, Cooper DJ, Bellomo R. Dynamic lactate indices as predictors of outcome in critically ill patients. Crit Care. 2011;15:R242.
Genzel-Boroviczeny O, Christ F, Glas V. Blood transfusion increases functional capillary density in the skin of anemic preterm infants. Pediatr Res. 2004;56:751–5.
Yuruk K, Almac E, Bezemer R, Goedhart P, de Mol B, Ince C. Blood transfusions recruit the microcirculation during cardiac surgery. Transfusion. 2011;51:961–7.
Yuruk K, Bartels SA, Milstein DM, Bezemer R, Biemond BJ, Ince C. Red blood cell transfusions and tissue oxygenation in anemic hematology outpatients. Transfusion. 2012;52:641–6.
Creteur J, Neves AP, Vincent JL. Near-infrared spectroscopy technique to evaluate the effects of red blood cell transfusion on tissue oxygenation. Crit Care. 2009;13 Suppl 5:S11.
Sakr Y, Chierego M, Piagnerelli M, Verdant C, Dubois MJ, Koch M, Creteur J, Gullo A, Vincent JL, De Backer D. Microvascular response to red blood cell transfusion in patients with severe sepsis. Crit Care Med. 2007;35:1639–44.
Sadaka F, Aggu-Sher R, Krause K, O’Brien J, Armbrecht ES, Taylor RW. The effect of red blood cell transfusion on tissue oxygenation and microcirculation in severe septic patients. Ann Intensive Care. 2011;1:46.
Weinberg JA, MacLennan PA, Vandromme-Cusick MJ, Angotti JM, Magnotti LJ, Kerby JD, Rue III LW, Barnum SR, Patel RP. Microvascular response to red blood cell transfusion in trauma patients. Shock. 2012;37:276–81.
Kopterides P, Theodorakopoulou M, Nikitas N, Ilias I, Vassiliadi DA, Orfanos SE, Tsangaris I, Maniatis NA, Tsantes AE, Travlou A, Dimitriadis G, Armaganidis A, Ungerstedt U, Dimopoulou I. Red blood cell transfusion affects microdialysis-assessed interstitial lactate/pyruvate ratio in critically ill patients with late sepsis. Intensive Care Med. 2012;38:1843–50.
Roberson RS, Lockhart E, Shapiro NI, Bandarenko N, McMahon TJ, Massey MJ, White WD, Bennett-Guerrero E. Impact of transfusion of autologous 7- versus 42-day-old AS-3 red blood cells on tissue oxygenation and the microcirculation in healthy volunteers. Transfusion. 2012;52:2459–64.
Walsh TS, McArdle F, McLellan SA, Maciver C, Maginnis M, Prescott RJ, McClelland DB. Does the storage time of transfused red blood cells influence regional or global indexes of tissue oxygenation in anemic critically ill patients? Crit Care Med. 2004;32:364–71.
Weinberg JA, MacLennan PA, Vandromme-Cusick MJ, Magnotti LJ, Kerby JD, Rue III LW, Angotti JM, Garrett CA, Hendrick LE, Croce MA, Fabian TC, Barnum SR, Patel RP. The deleterious effect of red blood cell storage on microvascular response to transfusion. J Trauma Acute Care Surg. 2013;75:807–12.
Donati A, Damiani E, Luchetti MM, Domizi R, Scorcella C, Carsetti A, Gabbanelli V, Carletti P, Bencivenga R, Vink H, Adrario E, Piagnerelli M, Gabrielli A, Pelaia P, Ince C. Microcirculatory effects of the transfusion of leukodepleted or non-leukodepleted red blood cells in septic patients: a pilot study. Crit Care. 2014;18:R33.
Mudumbai SC, Cronkite R, Hu KU, Wagner T, Hayashi K, Ozanne GM, Davies MF, Heidenreich P, Bertaccini E. Association of admission hematocrit with 6-month and 1-year mortality in intensive care unit patients. Transfusion. 2011;51:2148–59.
Koch CG, Li L, Sun Z, Hixson ED, Tang A, Phillips SC, Blackstone EH, Henderson JM. Hospital-acquired anemia: prevalence, outcomes, and healthcare implications. J Hosp Med. 2013;8:506–12.
Pape A, Stein P, Horn O, Habler O. Clinical evidence of blood transfusion effectiveness. Blood Transfus. 2009;7:250–8.
Dellinger RP, Levy MM, Rhodes A, Annane D, Gerlach H, Opal SM, Sevransky JE, Sprung CL, Douglas IS, Jaeschke R, Osborn TM, Nunnally ME, Townsend SR, Reinhart K, Kleinpell RM, Angus DC, Deutschman CS, Machado FR, Rubenfeld GD, Webb S, Beale RJ, Vincent JL, Moreno R. Surviving sepsis campaign: international guidelines for management of severe sepsis and septic shock, 2012. Intensive Care Med. 2013;39:165–228.
Retter A, Wyncoll D, Pearse R, Carson D, McKechnie S, Stanworth S, Allard S, Thomas D, Walsh T. Guidelines on the management of anaemia and red cell transfusion in adult critically ill patients. Br J Haematol. 2013;160:445–64.
Hebert PC, Wells G, Blajchman MA, Marshall J, Martin C, Pagliarello G, Tweeddale M, Schweitzer I, Yetisir E. A multicenter, randomized, controlled clinical trial of transfusion requirements in critical care. Transfusion Requirements in Critical Care Investigators, Canadian Critical Care Trials Group. N Engl J Med. 1999;340:409–17.
Netzer G, Liu X, Harris AD, Edelman BB, Hess JR, Shanholtz C, Murphy DJ, Terrin ML. Transfusion practice in the intensive care unit: a 10-year analysis. Transfusion. 2010;50:2125–34.
Murphy DJ, Needham DM, Netzer G, Zeger SL, Colantuoni E, Ness P, Pronovost PJ, Berenholtz SM. RBC transfusion practices among critically ill patients: has evidence changed practice? Crit Care Med. 2013;41:2344–53.
Hajjar LA, Vincent JL, Galas FR, Nakamura RE, Silva CM, Santos MH, Fukushima J, Kalil FR, Sierra DB, Lopes NH, Mauad T, Roquim AC, Sundin MR, Leao WC, Almeida JP, Pomerantzeff PM, Dallan LO, Jatene FB, Stolf NA, Auler Jr JO. Transfusion requirements after cardiac surgery: the TRACS randomized controlled trial. JAMA. 2010;304:1559–67.
Walsh TS, Boyd JA, Watson D, Hope D, Lewis S, Krishan A, Forbes JF, Ramsay P, Pearse R, Wallis C, Cairns C, Cole S, Wyncoll D. Restrictive versus liberal transfusion strategies for older mechanically ventilated critically ill patients: a randomized pilot trial. Crit Care Med. 2013;41:2354–63.
Naidech AM, Shaibani A, Garg RK, Duran IM, Liebling SM, Bassin SL, Bendok BR, Bernstein RA, Batjer HH, Alberts MJ. Prospective, randomized trial of higher goal hemoglobin after subarachnoid hemorrhage. Neurocrit Care. 2010;13:313–20.
Carson JL, Terrin ML, Noveck H, Sanders DW, Chaitman BR, Rhoads GG, Nemo G, Dragert K, Beaupre L, Hildebrand K, Macaulay W, Lewis C, Cook DR, Dobbin G, Zakriya KJ, Apple FS, Horney RA, Magaziner J. Liberal or restrictive transfusion in high-risk patients after hip surgery. N Engl J Med. 2011;365:2453–62.
Vincent JL. Transfusion triggers: getting it right! Crit Care Med. 2012;40:3308–9.
Vincent JL. Indications for blood transfusions: too complex to base on a single number? Ann Intern Med. 2012;157:71–2.
Holst LB, Haase N, Wetterslev J, Wernerman J, Aneman A, Guttormsen AB, Johansson PI, Karlsson S, Klemenzson G, Winding R, Nebrich L, Albeck C, Vang ML, Bulow HH, Elkjaer JM, Nielsen JS, Kirkegaard P, Nibro H, Lindhardt A, Strange D, Thormar K, Poulsen LM, Berezowicz P, Badstolokken PM, Strand K, Cronhjort M, Haunstrup E, Rian O, Oldner A, Bendtsen A, Iversen S, Langva JA, Johansen RB, Nielsen N, Pettila V, Reinikainen M, Keld D, Leivdal S, Breider JM, Tjader I, Reiter N, Gottrup U, White J, Wiis J, Andersen LH, Steensen M, Perner A. Transfusion requirements in septic shock (TRISS) trial – comparing the effects and safety of liberal versus restrictive red blood cell transfusion in septic shock patients in the ICU: protocol for a randomised controlled trial. Trials. 2013;14:150.
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Vincent, JL. (2015). Red Blood Cell Transfusion Trigger in Sepsis. In: Juffermans, N., Walsh, T. (eds) Transfusion in the Intensive Care Unit. Springer, Cham. https://doi.org/10.1007/978-3-319-08735-1_3
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