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Ann Thorac Surg 1997;63:269-276
© 1997 The Society of Thoracic Surgeons
Departments of Cardiac Surgery and Intensive Care, University Hospital Erasme, Free University of Brussels, Brussels, Belgium
| Abstract |
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, interleukin (IL)-6, and IL-8, to the postoperative systemic inflammatory response syndrome. Antiinflammatory cytokines, such as IL-10, however, may also play an important role in limiting these complications. Methods. The English-language literature was reviewed. Emphasis was placed on cytokine responses during clinical CPB for cardiac operations and, in particular, for heart and heart-lung transplantation.
Results. The recent data indicate that (1) although cytokine release can be triggered by many factors during CPB, ischemia-reperfusion may play the most important role; (2) the levels of tumor necrosis factor-
, IL-6, and IL-8 are correlated with the duration of cardiac ischemia and the myocardium is a major source of these three cytokines during CPB; (3) IL-10 levels are correlated with the duration of CPB and the liver is a major source of IL-10 during CPB; and (4) steroid pretreatment is an effective intervention to inhibit the release of proinflammatory cytokines and enhance IL-10 production.
Conclusions. The improved knowledge of cytokine responses to CPB may help to develop interventions aimed at reducing postoperative morbidity and mortality.
| Introduction |
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(TNF-
) [12, 13], interleukin (IL)-1ß [13], and IL-8 [1416], has been associated with the development of complications after CPB. Interestingly, the antiinflammatory cytokine IL-10 is also released during CPB [1719]. Hence, the inflammatory response to CPB is an extremely complex phenomenon that is far from completely understood. Table 1
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[22, 23]. Local release of TNF in the myocardium may be involved in the postischemic myocardial depression ("stunning") after CPB [21]. Some of these effects may be mediated by an increased production of nitric oxide within cardiac myocytes [20, 21]. Proinflammatory cytokines may also profoundly alter the peripheral circulation, reducing vascular tone and thus, resulting in postoperative low systemic vascular resistance [13]. Cytokines also exert a direct damaging effect to the other organs and contribute to the development of multiorgan failure [24]. Finally, the release of cytokines under CPB conditions may be involved in immunologic alterations that can develop in the postoperative period [25, 26]. Once the release of cytokines during CPB has been described, it becomes important to explore the mechanisms involved. A better understanding of this process may lead us to consider some form of intervention. The aim of the present article is to review some important elements implicated in the cytokine response to CPB, with particular reference to patients undergoing cardiac transplantation.
| The Role of Endotoxin Release |
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[6, 30, 31]. Circulating endotoxin can appear immediately after the beginning of CPB [27] and the gut is its most likely source, as CPB has been shown to impair gut barrier function and lead to increase gut permeability [32, 33]. Although endotoxin is a potent trigger of the inflammatory cascade of mediators, the role of endotoxin in the release of cytokines during CPB is not straightforward. For instance, Dauber and associates [34] found that bypass-induced coronary and pulmonary vascular injury correlated with peak circulating TNF levels, but not with endotoxin levels, although both of them were associated with peripheral pump-oxygenator bypass. | The Role of Complement Activation |
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| The Role of Ischemia-Reperfusion and the Relationship With Myocardial Injury |
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production that further results in pulmonary and hepatic injury. Kukielka and associates [40] recently demonstrated that IL-6 synthesis by the canine myocardium is accelerated by reperfusion.
Jansen and colleagues [12] first reported that TNF concentration can be detected only after release of the aortic cross-clamp during clinical CPB. Consistently, the important role of ischemia-reperfusion is supported by some other observations relating the magnitude of proinflammatory cytokine response to the duration of ischemia [15, 16, 18]. Kawamura and co-workers [15] studied 11 patients undergoing valvular operations and found IL-6 and IL-8 levels to be correlated with the duration of aortic cross-clamping and the degree of myocardial injury as reflected by the creatine kinase-MB isoenzyme values. Hennein and colleagues [16] showed in 22 patients undergoing coronary artery bypass grafting (CABG) that the duration of aortic cross-clamping was the only independent predictor of postoperative TNF-
and IL-6 levels. These investigators reported a direct relationship between IL-6 and IL-8 levels and the development of left ventricular wall dyskinesia in the postoperative period [16]. In 10 patients undergoing normothermic CPB, however, Frering and associates [41] failed to observe any significant correlation between IL-6 and IL-8 levels and either the CPB time or the aortic cross-clamping time.
To further define the influence of the duration of myocardial ischemia on the degree of cytokine release after CPB, we compared the blood cytokine levels in patients undergoing CABG with those undergoing heart transplantation (HTx), in whom the duration of ischemia was much longer. Levels of TNF-
, IL-6, and IL-8, which increased after reperfusion of the myocardium, were much higher in the HTx group than in the CABG group [18]. Moreover, we recently extended these findings to a larger population, including recipients of heart-lung transplantation (HLTx) who had had an even longer ischemic time. Blood sampling schedule, cytokine determination, and data analysis were the same as described previously [18]. Steroids were only given in the HTx and HLTx group, starting 90 minutes after declamping. In contrast to a previous report [16], TNF-
levels did not correlate with the duration of ischemia in the current study at any time point. However, IL-6, IL-8, and IL-10 levels 1 to 2 hours after aortic declamping correlated significantly with the duration of ischemia. Figure 1
shows this correlation 90 minutes after declamping.
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| The Role of Interleukin-10 and the Organ Source of Cytokines |
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[45]. We could not find any obvious relation between the levels of IL-10 and the other mediators. In the latter study, we observed that IL-10 levels correlated strongly with the duration of ischemia (Fig 1
This begs the question of the source of these cytokines during CPB. Although it is logical to consider the myocardium as an important source, other organs also experience ischemia-reperfusion and therefore, may also release cytokines. To define the source of these cytokines, we recently introduced a coronary sinus catheter in patients undergoing CABG. Cytokine levels were simultaneously measured in arterial blood, coronary sinus blood, and mixed venous blood. We found that the myocardium, but not the lungs, is a major source of TNF-
and IL-6 [23]. Furthermore, the heart may also release IL-8 during more severe injury [18, 23, 46]. In fact, Burns and colleagues [47] recently reported that activated local IL-8 gene expression in the myocardium is associated with pediatric CPB.
Neither the heart nor the lung, however, is the source of IL-10 [23]. We hypothesize that other organs such as the liver are primarily responsible for IL-10 release during CPB. Le Moine and colleagues [48] reported that the ischemic liver can be an important source of IL-8 and IL-10. In their study, IL-10 levels did not correlate with the duration of ischemia of the liver allografts [48]. Our previous study also found that IL-10 production was similar after HTx and CABG [18], suggesting the mechanism of IL-10 release is different with those proinflammatory cytokines. Accordingly, we recently measured IL-10 levels simultaneously in hepatic venous blood and arterial blood in steroid-pretreated patients undergoing CPB. We observed that the liver is a main source of IL-10 shortly after reperfusion during CPB [49]. By further including data from our previous study [50] of group II patients (6 HTx and 4 HLTx patients), who also received steroid pretreatment, arterial IL-10 levels 1 hour after aortic declamping in these patients were significantly correlated with the duration of CPB (Fig 3
).
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| The Importance of Temperature |
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, IL-1ß, and IL-6 [13], but not of IL-8 [53], were significantly higher after normothermic CPB than hypothermic CPB. This temperature-dependent release of cytokines was incriminated in greater need for vasopressor support after normothermic CPB [13]. An earlier study [11] also found that IL-1 production is correlated with the increase in patients' body temperature. On the other hand, Seghaye and colleagues [19] recently reported that hypothermia could also modulate IL-10 release. However, another clinical study [41] did not confirm that differences in temperature during CPB could influence either the production of cytokines (TNF-
, IL-1ß, IL-6, and IL-8) or the systemic vascular resistance. | Anticytokine Strategies During Cardiopulmonary Bypass |
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and IL-6 by hemofiltration may have beneficial effects in children undergoing CPB. Steinberg and colleagues [56] found that heparin bonding of the bypass circuits can reduce the release of IL-6 and IL-8, but another Steinberg and associates [9] reported that heparin-coated CPB circuits have no effect on complement activation or cytokine production. Heparin-coated circuits with reduced doses of heparin are not likely to totally prevent the damaging effects of CPB [57]. It may be necessary, however, to maintain standardized systemic heparinization with the use of heparin-coated circuits. Such a protocol has been shown to decrease complement and TNF generation [58] and thereby improve the postoperative recovery of patients [59]. On the other hand, steroid administration has been a topic of intense investigation, which will be summarized in the next section. Aprotinin may present another option to reduce inflammatory response to CPB. Hill and co-workers [60] recently found that low-dose aprotinin was as effective as steroids in inhibiting CPB-induced release of TNF-
. | Steroid Administration Before Cardiopulmonary Bypass |
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production after reperfusion. These effects were associated with a lower incidence of postoperative hemodynamic instability [12]. High TNF-
levels have been recently related to an altered left ventricular performance in patients after CPB [30]. Engelman and co-workers [63] showed that steroid pretreatment can markedly inhibit the production of IL-1ß and IL-8. Tabardel and associates [17] reported that steroid administration before CPB can also increase the release of IL-10. Enhancing the production of IL-10 may bring some beneficial effects not only by inhibiting the release of other proinflammatory cytokines [42, 43], but also by diminishing the immunocyte hyperstimulation under CPB conditions [64]. By inhibition of TNF-
, IL-6, and IL-8, steroid pretreatment can prevent peripheral vasodilation after warm heart operations [65]. However, it has been suggested that steroids may increase endotoxin release [29], which might counterbalance some of their effects.
We [50] recently documented that administration of steroids before HTx and HLTx procedures, instead of as usual at the end of CPB, can significantly inhibit TNF-
and IL-8 production but greatly increase the release of IL-10. These results are in agreement with previous studies stressing the crucial importance of the timing of anticytokine interventions [54]. Steroids have also been reported to negatively regulate IL-6 production [65]. Interleukin-6 levels are thought to reflect the degree of inflammatory injury after CPB [24]. Interestingly, IL-6 release is not significantly influenced by the timing of steroid administration [50]. Our study also included HLTx patients, and the lung allograft is able to release TNF-
, IL-2, and interferon-
[66, 67]. We noted that IL-8 levels increased much higher in HLTx patients than in HTx patients [50]. A possible explanation is that the longer duration of CPB and ischemia in HLTx than in HTx was associated with a higher cardiac, as well as pulmonary, release of cytokines.
The immunomodulating effects of steroids may have beneficial influences on allograft survival in HTx and HLTx patients. In particular, the release of IL-10 may provide benefits for prolonging allograft survival and induce tolerance [68], although a recent study suggested that IL-10 may serve a function in the immune regulation of the infiltrate at sites of inflammation, rather than in immune suppression of the rejection process [69]. Intragraft infusion of another important antiinflammatory cytokine IL-4, but not IL-10, may prolong graft survival [70]. It was recently suggested that steroid pretreatment can increase IL-4 production in vitro [71]. We observed, however, that IL-4 was not significantly released in steroid-pretreated patients during CPB [49]. Further investigations are certainly warranted to explore the pathophysiology involved and thereby improve therapy.
| Summary |
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and IL-8, but also by enhancing the release of antiinflammatory cytokine IL-10. A better understanding of the cytokine responses to CPB may lead to other interventions aimed at reducing the incidence and the severity of postoperative complications by modulating the inflammatory reactions associated with CPB.
| Acknowledgments |
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| Footnotes |
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| References |
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gene and protein expression in adult feline myocardium after endotoxin administration. J Clin Invest 1995;96:104252.
in the pathophysiologic alterations after hepatic ischemia/reperfusion injury in the rat. J Clin Invest 1990;85:193643.
, interleukin-2, and interferon-
in human pulmonary allografts. J Heart Lung Transplant 1995;14:5128.[Medline]
and interferon-
after ischemia reperfusion injury in the lung allograft. Transplantation 1994;58:115862.[Medline]
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A Sablotzki, M Dehne, I Welters, T Menges, N Lehmann, G Gorlach, C Osmer, and G Hempelmann Alterations of the cytokine network in patients undergoing cardiopulmonary bypass Perfusion, December 1, 1997; 12(6): 393 - 403. [Abstract] [PDF] |
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