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J Thorac Cardiovasc Surg 1994;108:636-641
© 1994 Mosby, Inc.

CARDIOPULMONARY BYPASS,
MYOCARDIAL MANAGEMENT, AND SUPPORT TECHNIQUES

Circulating cytokines in patients undergoing normothermic cardiopulmonary bypass

B. Frering, MDa, I. Philip, MDa,b, M. Dehoux, PhDb,c, C. Rolland, PhDb, J. M. Langlois, MDd, J. M. Desmonts, MDa,b


Paris, France

Received for publication Jan. 11, 1994. Accepted for publication May 10, 1994. Address for reprints: I. Philip, MD, Département d'Anesthésie et de Reanimation Chirurgicale, Hopital Bichat, 46 rue Henri-Huchard, 75878 Paris Cedex 18, France.

Abstract

To determine the cytokine release during normothermic cardiopulmonary bypass, we have measured plasmatic levels of tumor necrosis factor-{alpha}and interleukins-1ß, 6, and 8 in 10 patients during the first 24 hours after the start of bypass. Arterial blood samples were collected at intervals before, during, and after bypass. Interleukin-1ß was not detectable in the plasma, and traces of tumor necrosis factor-{alpha}were detected in only three patients at times independent of the cardiopulmonary bypass procedure. Circulating endotoxin remained undetectable. Plasma interleukin-6 and interleukin-8 rose significantly from 2 until 24 hours after the start of bypass (p < 0.05) and peaked respectively at 4 and 2 hours after the beginning of bypass (interleukin-6, 268.1 ± 131.43 pg/ml; interleukin-8, 370 ± 420 pg/ml; mean peak ± standard deviation). Peak values of interleukin-6 and interleukin-8 were correlated neither with the duration of aortic crossclamping or the bypass procedure nor with the hemodynamic parameters recorded at the same times. This study shows that normothermic cardiopulmonary bypass does not induce systemic release of tumor necrosis factor-{alpha}and interleukin-1ß. A local production of these cytokines cannot be excluded, because interleukin-6 and interleukin-8 are produced by stimulated macrophages and monocytes in response to tumor necrosis factor-{alpha}and interleukin-1ß. Our results, at normothermia, show a similar pattern of interleukin-6 and interleukin-8 release when compared with release during hypothermic cardiopulmonary bypass. Interleukin-8, an important chemotactic neutrophil factor, might play a role in reperfusion injuries observed in lungs and heart after cardiopulmonary bypass. (J THORAC CARDIOVASC SURG 1994;108:636-41)

Exposure of blood to extracorporeal artificial surfaces during cardiopulmonary bypass (CPB) induces an acute inflammatory response. Go 1 After cardiac surgery, this response is a combination of interaction of blood components with artificial surfaces, reperfusion injury, and activation by endotoxin. Go Go 2,3 The inflammatory process might be associated with morbidity caused by organ dysfunction observed after CPB. Different inflammatory pathways are activated after CPB, including the complement system, Go Go 4,5 the contact system, thepolymorphonuclear neutrophils, Go Go 6,7 and the mononuclear cells, leading to cytokine release. Go Go 2,8

Indeed, previous studies have reported different patterns of cytokine production after hypothermic CPB. Haeffner-Cavaillon and associates Go 9 demonstrated intracellular production of interleukin-1 (IL-1) in monocytes. Interestingly, no circulating IL-1ß has been found in the plasma of patients after hypothermic bypass. Go Go 8,10 Conflicting data are available for tumor necrosis factor-{alpha} (TNF{alpha}), because it remained undetectable in some studies, Go Go 9-13 although others have measured significant plasma values of TNF{alpha} after bypass. Go Go 14,15 TNF{alpha} and IL-1ß, when produced in excess, might induce deleterious effects, including endothelial dysfunction with enhanced vascular permeability, decreased systemic vascular resistances, and myocardial depression. Go Go 16-18

High levels of interleukin-6 (IL-6) have been reported after cardiac surgery, Go Go Go Go 2,8,11,12 but the clinical relevance remains unclear. Neutrophil activation described after CPB might be induced by interleukin-8 (IL-8), known to be a major neutrophil chemotactic factor. Go 19 Recent investigations have reported its pathophysiologic role in different clinical situations, particularly in reperfusion injury. Go 20 Three studies have found an increase in plasma IL-8 levels after hypothermic CPB. Go Go Go 11,21,22

Warm heart surgery, with warm blood cardioplegia and normothermic CPB, has been recently introduced. Warm blood cardioplegia seems to be an effective method of myocardial protection. Go Go 23,24 Normothermic CPB shortens CPB duration and minimizes platelet dysfunction. Go 25 Nevertheless, previous studies have reported lower systemic vascular resistance during normothermic CPB when compared with hypothermic CPB. Go Go 26,27 A greater inflammatory response in normothermia, with enhanced complement activation and IL-1 release, has been documented in vitro. Go 9 An enhanced cytokine release after normothermic CPB, mainly TNF{alpha} and IL-1ß, might partly explain hemodynamic differences between warm and cold surgery.

The aim of our prospective work was to measure circulating concentrations of TNF{alpha}, IL-1ß, IL-6, IL-8, and endotoxin in 10 patients undergoing normothermic CPB for cardiac surgery. Indeed, cytokine production has been studied only after hypothermic CPB, and to our knowledge no data are available concerning normothermic CPB.

PATIENTS AND METHODS

Patients
After approval by the local ethics committee, 10 patients were prospectively included for the study. They underwent a valve operation with normothermic CPB. Their ages ranged from 23 to 83 years (46.8 ± 16 years, mean ± standard deviation). No corticosteroids were administered before or during the study. Patients with suspected infectious disease were excluded. Details on patients and length of CPB are summarized in GoTable I.


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  		Table I. Demographic data
 
Radial and pulmonary arterial catheters were introduced with the aid of local anesthesia. Anesthetic induction and maintenance were achieved with high doses of fentanyl, pancuronium bromide, and midazolam. The extracorporeal circuit consisted of a roller pump (Cobe Stöckert, Stöckert Instrument, Rungis, France), a cardiotomy reservoir, and a Sorin membrane oxygenator (Sorin Laboratories, Mirandola, Italy). The circuit was primed with 1500 ml of Ringer's lactate solution, sodium bicarbonate, and gelatin. Heparin (400 UI/kg body weight) was injected into the right atrium before cannulation, to achieve an activated clotting time of more than 400 seconds. Flow rates of 2.4 L · m 2 · mm -1 were used. Normothermia (temperature >36.5° C), assessed by the monitoring of bladder temperature, was assured during the operation and CPB. Ultrafiltration was never performed during the study. Myocardial protection was achieved by cold blood cardioplegic solution infused every 30 minutes. Before aortic unclamping, reperfusion was performed with the same blood cardioplegic solution at 37° C. Heparin was neutralized with protamine sulfate, at a ratio of 1:3, within 10 minutes after the end of CPB.

Serial blood samples (5 ml) were withdrawn from the radial artery catheter before sternotomy (T0); at the beginning of CPB (H0); and at intervals of 1, 2, 4, 6, 10, and 24 hours (H1 to H24) after the beginning of CPB. Blood samples were collected into sterile vacuum tubes with ethylenediaminetetraacetic acid and immediately centrifuged. An aliquot of plasma was obtained and stored at -70° C until cytokine and endotoxin assays were performed. Mean arterial pressure, cardiac index (assessed by thermodilution), systemic vascular resistances, and bladder temperature were recorded all along the study.

Enzyme immunoassays for IL-1ß, IL-6, IL-8, and TNF{alpha}
The levels of plasma immunoreactive IL-1ß, IL-6, IL-8, and TNF{alpha} were determined by immunoenzymatic assays according to the manufacturer's procedure. IL-1ß, IL-6, IL-8, and TNF{alpha} enzyme-linked immunosorbent assays were from Amersham (Biotrak, Les Ulis, France). The detection limits were 3 pg/ml for IL-1ß and IL-6, 10 pg/ml for TNF{alpha}, and 18 pg/ml for IL-8. Results were not corrected for hemodilution.

Measurement of endotoxins
Endotoxin was determined using the Limulus amebocyte lysate assay from TechGen (Limusate, Les Ulis, France). The sensitivity of this assay was 0.06 EU/ml.

Statistical analysis
The data were analyzed by analysis of variance. Correlations between peak cytokine values and different parameters were assessed by Spearman's rank correlation. Significance was accepted when p was less than 0.05. Results are expressed as mean ± standard deviation.

RESULTS

Patients
GoTable I shows the clinical characteristics and operative procedures for the 10 patients. Mean CPB and aortic clamping durations were 113.2 ± 17.6 and 88.7 ± 16.5 minutes, respectively. Temperature was 36.7° ± 0.4° C during CPB and reached a maximal value of 37.7° ± 0.6° C at H10. All of the patients recovered uneventfully, except one patient who required surgical hemostasis for major bleeding at H12.

Cytokines and endotoxin
IL-1ß and TNF{alpha}. Il-1ß was never detectable in our 10 patients until H24. TNF{alpha} was undetectable except in three patients. When detectable, plasma TNF{alpha} concentrations were low (<100 pg/ml) and no correlation was found with operative times.

IL-6. Fig. 1 shows changes in plasma concentration of IL-6. Plasma IL-6 was detectable in one patient at T0 (12 pg/ml). Plasma levels remained unchanged after 1 hour of CPB, raised significantly at H2, and peaked 4 hours after the start of CPB, remaining above baseline values 24 hours after CPB. The mean peak value at H4 was 268.1 ± 131.43 pg/ml. IL-6 plasma levels rose significantly in all patients.



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  		Fig. 1. Effect of CPB on plasma IL-6 concentration (mean ± standard error of the mean). Time points: T0, after induction; H0, at the beginning of CPB; and 1, 2, 4, 6, 10, and 24 hours after the beginning of CPB.(*p < 0.05 versus T0.)

 
IL-8. Changes in plasma levels of IL-8 are shown in Fig. 2. Three patients had low levels of IL-8 at T0 (30, 34, and 110 pg/ml). Plasma IL-8 concentration rose in all of the patients after the start of CPB, peaked at H2 (370 + 420 pg/ml), and remained significantly elevated until H6. Values at H10 and H24 were not significantly above the baseline level, but IL-8 was still detectable in seven patients 24 hours after CPB. In two patients, IL-8 was not measured at H24, for technical reasons. Peak values were greater than 1000 pg/ml (1497 pg/ml) in only one patient. Interestingly, IL-6 concentration was also the highest at this time (838 pg/ml), in contrast to IL-1ß and TNF{alpha}, which remained undetectable.



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  		Fig. 2. Effect of CPB on plasma IL-8 concentration (mean ± standard error of the mean). Time points are those depicted in the legend to Fig. 1. (*p < 0.05 versus T0.)

 
Endotoxin. Endotoxin was not detected in the plasma at any time of the study in any of the patients.

Correlation between changes in cytokine levels and hemodynamic data
There was no correlation betweenpeak levels of IL-6 or IL-8 and CPB or aortic clamping durations. Fig. 3 shows mean arterial pressure and systemic vascular resistances during the study. No correlation was found between either IL-6 or IL-8 concentrations and mean arterial pressure, cardiac output, or systemic vascular resistances.




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  		Fig. 3. Changes in mean arterial pressure (M.A.P., mm Hg) and systemic vascular resistances (SVR, dyne·sec/cm 5) with time in 10 patients undergoing normothermic CPB. Results are expressed as mean ± standard deviation.

 
DISCUSSION

By contrast to the numerous data on cytokine release after hypothermic CPB, to our knowledge no data are available after normothermic CPB. This lack led us to measure, in 10 patients undergoing normothermic CPB, circulating levels of the main cytokines that could be involved in postoperative organ failure. We found an increase in plasma IL-6 and IL-8 concentrations after normothermic CPB, whereas IL-1ß and TNF{alpha} remained undetectable. Warm heart surgery was introduced a few years ago, but few prospective studies have been reported concerning the innocuousness of this technique. Go Go 23,24 Some previous studies concerning warm heart surgery reported lower systemic vascular resistance with this technique when compared with hypothermia, the "gold standard." Go Go 26,27 Warm heart surgery could increase vasopressor requirements. Go 26 Greater blood viscosity might contribute to increased systemic vascular resistance during hypothermia, but the possibility of an enhanced cytokine production after normothermic CPB has not been explored. Indeed, the temperature has a major influence on the different inflammatory pathways activated during CPB. Neutrophilia during CPB is prevented by hypothermia but reappears quickly when the body temperature is restored to 36° C. Go 28 In vitro, hypothermia reduces complement activation and inhibits IL-1ß production by monocytes. Go 9 Furthermore, clinical investigations have reported increased levels of cytokine only after rewarming of the patients. Go Go Go Go Go 9,11,14,21,29

In hypothermia, conflicting data are available concerning circulating levels of TNF{alpha} or IL-1ß. In many studies, plasma IL-1ß and TNF{alpha} have not been detected after hypothermic CPB, Go Go Go Go Go 8,10,12,13,21 except insome patients of two studies. Go Go 14,15 Some possibilities might explain the discrepancies. During CPB, variable levels of endotoxin have been reported, Go Go Go 14,30,31 with enhanced plasma levels of TNF. Go 32 Endotoxin was not detected in the plasma of our patients. The short half-life of TNF{alpha} and IL-1ß and differences between methods of cytokine measurement might also explain discrepancies between different studies. Bioassays detect biologic activity, measured in vitro on specific cells. By contrast, immunoassays measure serum antigens. The latter may detect complexes of cytokine and cytokine-soluble receptor or cytokine inhibitor as free cytokine and thus provide false-positive levels, when compared with bioassays. Go 33 Furthermore, the absence of detectable circulating cytokines does not exclude a likely local production by activated cells. Go 34

In our study, we did not find significant levels of circulating TNF{alpha} or IL-1ß after normothermic CPB. This argues against a deleterious effect of normothermic CPB with an exacerbated production of these two cytokines, which might induce vasodilation and contribute to postoperative complications. Moreover, systemic vascular resistance did not decrease significantly in our patients. Only two patients required injection of phenylephrine (250 and 500 µg) to maintain systemic perfusion pressure above 50 mm Hg. Anesthetic management with high doses of fentanyl and neither halothane nor isoflurane might explain hemodynamic stability. Moreover, in our study myocardial protection was obtained with intermittent cold blood cardioplegia and not with continuous warm cardioplegia.

IL-6, known to have pleiotropic functions, is one of the key mediators in the acute phase response. Go 35 In the present study, plasma IL-6 levels increased significantly 2 hours (H2) after the start of CPB, peaked at H4, and remained elevated at H24. The peak was earlier than peaks observed after moderate hypothermic CPB, and thus normothermic CPB seems to quicken the inflammatory response. Nevertheless, although constantly observed after cardiac operations, a rise in plasma IL-6 levels is not specific to CPB because it also occurs after major noncardiac operations. Go Go 36-40

Neutrophil activation has been documented after CPB, with the release of the peroxidation products,Go 7 myeloperoxidase, Go 6 lactoferrin, and elastase. Go Go 6,10 The role of neutrophil activation in lung and myocardial injuries has been well documented in experimental or human investigations. Go Go Go Go Go 2,6,7,41-43 This led us to measure IL-8, a potent neutrophil chemotactic and activating factor. Go 19 Our results show an early increase in plasma IL-8 levels, with peak levels 2 hours after the beginning of CPB. The fact that peak values were not correlated with the length of aortic clamping or bypass might be due to the homogeneous durations of CPB in our patients. Recently, a rise in plasma IL-8 levels has been reported after hypothermic CPB. Go Go Go 11,21,22 Even if comparisons must be done with caution, it appears that normothermic CPB induces a pattern of IL-8 production similar to that observed with hypothermic CPB. Go Go Go 11,21,22

IL-8 production does not seem to be specific to cardiac surgery, but rather to situations of ischemia-reperfusion or anoxia-hyperoxia injuries. Go Go Go 21,22,44 Lung reperfusion injury in rabbits has been shown to be prevented by a monoclonal antibody against IL-8. Go 20 These studies emphasized the major role that IL-8 might play in the reperfusion injury described after cardiac operations. Thus we are now investigating the clinical relevance of IL-8 secretion on pulmonary function and neutrophil activation during normothermic CPB.

The cells involved in the production of IL-8 after cardiac surgery remain to be determined. Pulmonary production by alveolar macrophages might be a potent source of IL-8. Furthermore, high levels of this cytokine have been detected in the bronchoalveolar lavage fluid of patients after CPB. Go Go 22,45 A local production of TNF{alpha} and IL-1ß, even if undetectable in the circulation, could induce IL-8 synthesis and secretion.

In conclusion, our study shows that normothermic CPB is associated with IL-6 and IL-8 production, which is similar to that previously observed after hypothermic CPB. Plasma levels of TNF{alpha} and IL-1ß remain undetectable in our patients after CPB, results that are consistent with previous studies concerning hypothermic CPB. Our results suggest that normothermic CPB per se does not induce an overproduction of cytokines when compared with hypothermic CPB.

Footnotes

From Département d'Anesthésie et de Réanimation Chirurgicale,a Unité INSERM U408,b Laboratoire de Biochimie A,c and Service de Chirurgie Cardio-vasculaire,d Centre hospitalo-universitaire Bichat, Paris, France. Back

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L. H. Edmunds Jr. and R. W. Colman
Extracorporeal Circulation: Thrombosis and Bleeding
Card. Surg. Adult, January 1, 2003; 2(2003): 338 - 348.
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P. Menasche and L. H. Edmunds Jr.
Extracorporeal Circulation: The Inflammatory Response
Card. Surg. Adult, January 1, 2003; 2(2003): 349 - 360.
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L. Kubala, M. Ciz, J. Vondracek, J. Cerny, P. Nemec, P. Studenik, H. Cizova, and A. Lojek
Perioperative and postoperative course of cytokines and the metabolic activity of neutrophils in human cardiac operations and heart transplantation
J. Thorac. Cardiovasc. Surg., December 1, 2002; 124(6): 1122 - 1129.
[Abstract] [Full Text]

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Y. Fromes, D. Gaillard, O. Ponzio, M. Chauffert, M.-F. Gerhardt, P. Deleuze, and O. M. Bical
Reduction of the inflammatory response following coronary bypass grafting with total minimal extracorporeal circulation
Eur. J. Cardiothorac. Surg., October 1, 2002; 22(4): 527 - 533.
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 CirculationHome page
P. E. Greilich, K. Okada, P. Latham, R. R. Kumar, and M. E. Jessen
Aprotinin But Not {epsilon}-Aminocaproic Acid Decreases Interleukin-10 After Cardiac Surgery With Extracorporeal Circulation: Randomized, Double-Blind, Placebo-Controlled Study in Patients Receiving Aprotinin and {epsilon}-Aminocaproic Acid
Circulation, September 18, 2001; 104 (2009): I-265 - I-269.
[Abstract] [Full Text] [PDF]

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 SEMIN CARDIOTHORAC VASC ANESTHHome page
H. A. Hennein
Inflammation After Cardiopulmonary Bypass: Therapy for the Postpump Syndrome
Seminars in Cardiothoracic and Vascular Anesthesia, September 1, 2001; 5(3): 236 - 255.
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 J. Thorac. Cardiovasc. Surg.Home page
T. Suzuki, T. Ito, I. Kashima, K. Teruya, and T. Fukuda
Continuous perfusion of pulmonary arteries during total cardiopulmonary bypass favorably affects levels of circulating adhesion molecules and lung function
J. Thorac. Cardiovasc. Surg., August 1, 2001; 122(2): 242 - 248.
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M. Rothenburger, R. Soeparwata, M. C. Deng, E. Berendes, C. Schmid, T. D. T. Tjan, M. J. Wilhelm, M. Erren, D. Bocker, and H. H. Scheld
The impact of anti-endotoxin core antibodies on endotoxin and cytokine release and ventilation time after cardiac surgery
J. Am. Coll. Cardiol., July 1, 2001; 38(1): 124 - 130.
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K. Hashimoto, T. Sasaki, T. Hachiya, K. Onoguchi, H. Takakura, M. Oshiumi, and S. Takeuchi
Superior hepatic mitochondrial oxidation-reduction state in normothermic cardiopulmonary bypass
J. Thorac. Cardiovasc. Surg., June 1, 2001; 121(6): 1179 - 1186.
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J. Boldt, C. Brosch, A. Lehmann, G. Haisch, J. Lang, and F. Isgro
Prophylactic use of pentoxifylline on inflammation in elderly cardiac surgery patients
Ann. Thorac. Surg., May 1, 2001; 71(5): 1524 - 1529.
[Abstract] [Full Text] [PDF]

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A Sablotzki, J Muhling, M G Dehne, B Zickmann, R E Silber, and I Friedrich
Treatment of sepsis in cardiac surgery: role of immunoglobulins
Perfusion, March 1, 2001; 16(2): 113 - 120.
[Abstract] [PDF]

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 PerfusionHome page
D B. Sanders, D. F Larson, K. Hunter, M. Gorman, and B. Yang
Comparison of tumor necrosis factor-effect on the expression of iNOS in macrophage and cardiac myocytes
Perfusion, January 1, 2001; 16(1): 67 - 74.
[Abstract] [PDF]

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S. P. Marso, D. L. Bhatt, M. T. Roe, P. L. Houghtaling, M. Labinaz, N. S. Kleiman, C. Dyke, M. L. Simmoons, R. M. Califf, R. A. Harrington, et al.
Enhanced Efficacy of Eptifibatide Administration in Patients With Acute Coronary Syndrome Requiring In-Hospital Coronary Artery Bypass Grafting
Circulation, December 12, 2000; 102(24): 2952 - 2958.
[Abstract] [Full Text] [PDF]

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C. W. Marano, L. A. Garulacan, K. V. Laughlin, L. Igidbashian, C. Trace, S. M. Goldman, F. P. Sutter, G. A. Reichard Jr, and J. M. Mullin
Plasma concentrations of soluble tumor necrosis factor receptor I and tumor necrosis factor during cardiopulmonary bypass
Ann. Thorac. Surg., October 1, 2000; 70(4): 1313 - 1318.
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 Eur. J. Cardiothorac. Surg.Home page
P. Corbi, M. Rahmati, A. Delwail, D. Potreau, P. Menu, J. Wijdenes, and J.-C. Lecron
Circulating soluble gp130, soluble IL-6R, and IL-6 in patients undergoing cardiac surgery, with or without extracorporeal circulation
Eur. J. Cardiothorac. Surg., July 1, 2000; 18(1): 98 - 103.
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 Eur. J. Cardiothorac. Surg.Home page
J. Grunenfelder, G. Zund, A. Schoeberlein, E.R. Schmid, U. Schurr, R. Frisullo, F. Maly, and M. Turina
Expression of adhesion molecules and cytokines after coronary artery bypass grafting during normothermic and hypothermic cardiac arrest
Eur. J. Cardiothorac. Surg., June 1, 2000; 17(6): 723 - 728.
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 Ann. Thorac. Surg.Home page
B. M. Matata, A. W. Sosnowski, and M. Galinanes
Off-pump bypass graft operation significantly reduces oxidative stress and inflammation
Ann. Thorac. Surg., March 1, 2000; 69(3): 785 - 791.
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T. Suzuki, T. Fukuda, T. Ito, Y. Inoue, Y. Cho, and I. Kashima
Continuous pulmonary perfusion during cardiopulmonary bypass prevents lung injury in infants
Ann. Thorac. Surg., February 1, 2000; 69(2): 602 - 606.
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 Eur. J. Cardiothorac. Surg.Home page
I. Birdi, M. Caputo, M. Underwood, A.J. Bryan, and G.D. Angelini
The effects of cardiopulmonary bypass temperature on inflammatory response following cardiopulmonary bypass
Eur. J. Cardiothorac. Surg., November 1, 1999; 16(5): 540 - 545.
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M. K. Ilton, P. E. Langton, M. L. Taylor, N. L. A. Misso, M. Newman, P. J. Thompson, and J. Hung
DIFFERENTIAL EXPRESSION OF NEUTROPHIL ADHESION MOLECULES DURING CORONARY ARTERY SURGERY WITH CARDIOPULMONARY BYPASS
J. Thorac. Cardiovasc. Surg., November 1, 1999; 118(5): 930 - 937.
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S. Ashraf, K. Bhattacharya, Y. Tian, and K. Watterson
Cytokine and S100B levels in paediatric patients undergoing corrective cardiac surgery with or without total circulatory arrest
Eur. J. Cardiothorac. Surg., July 1, 1999; 16(1): 32 - 37.
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G. Asimakopoulos
Mechanisms of the systemic inflammatory response
Perfusion, July 1, 1999; 14(4): 269 - 277.
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 Anesth. Analg.Home page
D. J. Cook
Changing Temperature Management for Cardiopulmonary Bypass
Anesth. Analg., June 1, 1999; 88(6): 1254 - 1254.
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 PerfusionHome page
M. Yilmaz, S. Ener, H. Akalin, K. Sagdic, O A. Serdar, and M. Cengiz
Effect of low-dose methyl prednisolone on serum cytokine levels following extracorporeal circulation
Perfusion, May 1, 1999; 14(3): 201 - 206.
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C. Baufreton, L. Intrator, P. G.M. Jansen, H. te Velthuis, P. Le Besnerais, A. Vonk, J.-P. Farcet, C. R.H. Wildevuur, and D. Y. Loisance
Inflammatory response to cardiopulmonary bypass using roller or centrifugal pumps
Ann. Thorac. Surg., April 1, 1999; 67(4): 972 - 977.
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H. A. Hennein, U. Kiziltepe, S. Barst, K. A. Bocchieri, A. Hossain, D. R. Call, D. G. Remick, and J. P. Gold
VENOVENOUS MODIFIED ULTRAFILTRATION AFTER CARDIOPULMONARY BYPASS IN CHILDREN: A PROSPECTIVE RANDOMIZED STUDY
J. Thorac. Cardiovasc. Surg., March 1, 1999; 117(3): 496 - 505.
[Abstract] [Full Text] [PDF]

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 PerfusionHome page
C. Baufreton, M. Moczar, L. Intrator, P. G. Jansen, H. te Velthuis, P. Le Besnerais, J. P. Farcet, C. R. Wildevuur, and D. Y Loisance
Inflammatory response to cardiopulmonary bypass using two different types of heparin-coated extracorporeal circuits
Perfusion, December 1, 1998; 13(6): 419 - 427.
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 Ann. Thorac. Surg.Home page
A. Weerasinghe and K. M. Taylor
The platelet in cardiopulmonary bypass
Ann. Thorac. Surg., December 1, 1998; 66(6): 2145 - 2152.
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 SEMIN CARDIOTHORAC VASC ANESTHHome page
J. S. Steingrub
Novel Insights Into the Pathogenesis and Therapy of Circulatory Shock
Seminars in Cardiothoracic and Vascular Anesthesia, March 1, 1998; 2(1): 31 - 45.
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 Ann. Thorac. Surg.Home page
H. Gohra, Y. Fujimura, H. Ito, K. Hamano, T. Katoh, N. Zempo, and K. Esato
Granulocyte Elastase Release and Pulmonary Hemodynamics in Patients With Atrial Septal Defect
Ann. Thorac. Surg., March 1, 1998; 65(3): 719 - 723.
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 Ann. Thorac. Surg.Home page
S. Ashraf, J. Butler, Y. Tian, D. Cowan, S. Lintin, N. R. Saunders, K. G. Watterson, and P. G. Martin
Inflammatory Mediators in Adults Undergoing Cardiopulmonary Bypass: Comparison of Centrifugal and Roller Pumps
Ann. Thorac. Surg., February 1, 1998; 65(2): 480 - 484.
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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.
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 Ann. Thorac. Surg.Home page
T. Ohata, Y. Sawa, K. Kadoba, T. Masai, H. Ichikawa, and H. Matsuda
Effect of Cardiopulmonary Bypass Under Tepid Temperature on Inflammatory Reactions
Ann. Thorac. Surg., July 1, 1997; 64(1): 124 - 128.
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 Ann. Thorac. Surg.Home page
D. J. Goldstein, N. Moazami, J. A. Seldomridge, H. Laio, R. C. Ashton Jr, Y. Naka, D. J. Pinsky, and M. C. Oz
Circulatory Resuscitation With Left Ventricular Assist Device Support Reduces Interleukins 6 and 8 Levels
Ann. Thorac. Surg., April 1, 1997; 63(4): 971 - 974.
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M. Ernofsson, S. Thelin, and A. Siegbahn
MONOCYTE TISSUE FACTOR EXPRESSION, CELL ACTIVATION, AND THROMBIN FORMATION DURING CARDIOPULMONARY BYPASS: A CLINICAL STUDY
J. Thorac. Cardiovasc. Surg., March 1, 1997; 113(3): 576 - 584.
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 Ann. Thorac. Surg.Home page
S. Wan, J.-L. LeClerc, and J.-L. Vincent
Cytokine Responses to Cardiopulmonary Bypass: Lessons Learned From Cardiac Transplantation
Ann. Thorac. Surg., January 1, 1997; 63(1): 269 - 276.
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 Ann. Thorac. Surg.Home page
E. M. Boyle Jr, T. H. Pohlman, M. C. Johnson, and E. D. Verrier
Endothelial Cell Injury in Cardiovascular Surgery: The Systemic Inflammatory Response
Ann. Thorac. Surg., January 1, 1997; 63(1): 277 - 284.
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 Arterioscler. Thromb. Vasc. Bio.Home page
J. Apostolopoulos, P. Davenport, and P. G. Tipping
Interleukin-8 Production by Macrophages From Atheromatous Plaques
Arterioscler. Thromb. Vasc. Biol., August 1, 1996; 16(8): 1007 - 1012.
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R. L. Kormos, T. A. Gasior, A. Kawai, S. M. Pham, S. Murali, B. G. Hattler, and B. P. Griffith
TRANSPLANT CANDIDATE'S CLINICAL STATUS RATHER THAN RIGHT VENTRICULAR FUNCTION DEFINES NEED FOR UNIVENTRICULAR VERSUS BIVENTRICULAR SUPPORT
J. Thorac. Cardiovasc. Surg., April 1, 1996; 111(4): 773 - 783.
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M.-C. Seghaye, J. Duchateau, J. Bruniaux, S. Demontoux, C. Bosson, A. Serraf, G. Lecronier, E. Mokhfi, and C. Planche
INTERLEUKIN-10 RELEASE RELATED TO CARDIOPULMONARY BYPASS IN INFANTS UNDERGOING CARDIAC OPERATIONS
J. Thorac. Cardiovasc. Surg., March 1, 1996; 111(3): 545 - 553.
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S. Wan, A. Marchant, J.-M. DeSmet, M. Antoine, H. Zhang, J.-L. Vachiery, M. Goldman, J.-L. Vincent, and J.-L. LeClerc
HUMAN CYTOKINE RESPONSES TO CARDIAC TRANSPLANTATION AND CORONARY ARTERY BYPASS GRAFTING
J. Thorac. Cardiovasc. Surg., February 1, 1996; 111(2): 469 - 477.
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K. H.T. Teoh, C. A. Bradley, J. Gauldie, and H. Burrows
Steroid Inhibition of Cytokine-Mediated Vasodilation After Warm Heart Surgery
Circulation, November 1, 1995; 92(9): 347 - 353.
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M. C. Oz, H. Liao, Y. Naka, A. Seldomridge, D. N. Becker, R. E. Michler, C. R. Smith, E. A. Rose, D. M. Stern, and D. J. Pinsky
Ischemia-Induced Interleukin-8 Release After Human Heart Transplantation : A Potential Role for Endothelial Cells
Circulation, November 1, 1995; 92(9): 428 - 432.
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B. M. Steinberg, E. A. Grossi, D. S. Schwartz, D. E. McLoughlin, M. Aguinaga, C. Bizekis, J. Greenwald, A. Flisser, F. C. Spencer, A. C. Galloway, et al.
Heparin Bonding of Bypass Circuits Reduces Cytokine Release During Cardiopulmonary Bypass
Ann. Thorac. Surg., September 1, 1995; 60(3): 525 - 529.
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M. Dehoux, PhD, I. Philip, S. Chollet-Martin, A. Boutten, U. Hvass, J.-M. Desmonts, and G. Durand
Early production of interleukin-10 during normothermic cardiopulmonary bypass
J. Thorac. Cardiovasc. Surg., July 1, 1995; 110(1): 286 - 287.
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K. A. Sotaniemi
Long-Term Neurologic Outcome After Cardiac Operation
Ann. Thorac. Surg., May 1, 1995; 59(5): 1336 - 1339.
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