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2.
Br J Anaesth ; 114(1): 53-62, 2015 Jan.
Article in English | MEDLINE | ID: mdl-25240162

ABSTRACT

BACKGROUND: Preoperative renal insufficiency is an important predictor of mortality after cardiac surgery. This retrospective cohort study was designed to identify the optimal cut-off for baseline serum creatinine (bSCr) and estimated glomerular filtration rate (eGFR) to predict survival. Furthermore, we investigated the potential confounding effect of other perioperative risk indicators on short- and long-term survival. METHODS: Data of 9490 cardiac surgical patients were prospectively collected between 1997 and 2008 (follow up to 2010) at the Medical University Vienna. We identified bSCr cut-off values and calculated uni- and multivariate hazard models for short- and long-term survival and compared the results with a validation set from Zurich. The estimated survival curves defined a distinct period of increased mortality until 150 days. RESULTS: Cut-off values of >115 µmol litre(-1) for bSCr and ≤50 ml min(-1) for eGFR were identified. Increased bSCr, associated with higher mortality [hazard ratio (HR) 2.61, 95% confidence interval (CI) 2.43-2.80, P<0.0001], was present in 19.5% of patients and remained predictive for short- (HR 1.59, 95% CI 1.38-1.83, P=0.0027) and long-term survival (HR 1.46, 95% CI 1.32-1.62, P<0.0001) in the multivariate hazard models. A cut-off of >120 µmol litre(-1) for bSCr was determined for the validation set. Decreased eGFR was present in 23.6% (HR 2.86, 95% CI 2.67-3.06, P<0.0001). CONCLUSIONS: In our patients, increased bSCr was an independent predictor of mortality, which may critically influence risk evaluation and perioperative treatment guidance.


Subject(s)
Cardiac Surgical Procedures/mortality , Creatinine/blood , Postoperative Complications/blood , Postoperative Complications/mortality , Preoperative Period , Adolescent , Adult , Aged , Aged, 80 and over , Biomarkers/blood , Female , Glomerular Filtration Rate/physiology , Humans , Male , Middle Aged , Prospective Studies , Renal Insufficiency/blood , Retrospective Studies , Risk Assessment/methods , Risk Factors , Young Adult
3.
Br J Anaesth ; 112(2): 255-64, 2014 Feb.
Article in English | MEDLINE | ID: mdl-24169821

ABSTRACT

BACKGROUND: Infusion of 5% human albumin (HA) and 6% hydroxyethyl starch 130/0.4 (HES) during cardiac surgery expand circulating volume to a greater extent than crystalloids and would be suitable for a restrictive fluid therapy regimen. However, HA and HES may affect blood coagulation and could contribute to increased transfusion requirements. METHODS: We randomly assigned 240 patients undergoing elective cardiac surgery to receive up to 50 ml kg(-1) day(-1) of either HA, HES, or Ringer's lactate (RL) as the main infusion fluid perioperatively. Study solutions were supplied in identical bottles dressed in opaque covers. The primary outcome was chest tube drainage over 24 h. Blood transfusions, thromboelastometry variables, perioperative fluid balance, renal function, mortality, intensive care unit, and hospital stay were also assessed. RESULTS: The median cumulative blood loss was not different between the groups (HA: 835, HES: 700, and RL: 670 ml). However, 35% of RL patients required blood products, compared with 62% (HA) and 64% (HES group; P=0.0003). Significantly, more study solution had to be administered in the RL group compared with the colloid groups. Total perioperative fluid balance was least positive in the HA group [6.2 (2.5) litre] compared with the HES [7.4 (3.0) litre] and RL [8.3 (2.8) litre] groups (P<0.0001). Both colloids affected clot formation and clot strength and caused slight increases in serum creatinine. CONCLUSIONS: Despite equal blood loss from chest drains, both colloids interfered with blood coagulation and produced greater haemodilution, which was associated with more transfusion of blood products compared with crystalloid use only.


Subject(s)
Albumins/pharmacology , Blood Coagulation/drug effects , Cardiac Surgical Procedures , Hydroxyethyl Starch Derivatives/pharmacology , Isotonic Solutions/pharmacology , Postoperative Hemorrhage/drug therapy , Adult , Aged , Aged, 80 and over , Blood Coagulation Tests/methods , Blood Coagulation Tests/statistics & numerical data , Blood Transfusion/statistics & numerical data , Elective Surgical Procedures/methods , Female , Fluid Therapy/methods , Hemodilution/methods , Hemodilution/statistics & numerical data , Hemostasis/drug effects , Humans , Length of Stay/statistics & numerical data , Male , Middle Aged , Plasma Substitutes/pharmacology , Ringer's Lactate , Young Adult
5.
Int J Artif Organs ; 30(9): 798-804, 2007 Sep.
Article in English | MEDLINE | ID: mdl-17918125

ABSTRACT

BACKGROUND: Endocarditis, and prosthetic valve endocarditis in particular, is a serious disease with high morbidity and mortality. We investigate the effects of tigecycline, linezolid and vancomycin on biofilms of viridans group streptococci (VGS) isolated from patients with definite native or prosthetic valve endocarditis. METHODS AND RESULTS: Ten of 20 VGS blood stream isolates from patients with endocarditis formed biofilms in the microtiter plate biofilm model. The minimal inhibitory concentrations (MIC) for tigecycline, linezolid and vancomycin were determined using the microdilution broth method. Biofilms were grown for 24 hours and were incubated with tigecycline, linezolid and vancomycin at increasing concentrations from 1-128x MIC of the isolate being tested. Biofilm thickness was quantified by measuring the optical density (OD) after dyeing it with crystal violet. The incubation of the biofilms with tigecycline, linezolid or vancomycin resulted in a significant reduction of OD compared to the control biofilm without antibiotic (p<0.05). The optical density ratio (Odr) decreased significantly at 2x MIC for tigecycline, and at 8x MIC for linezolid and vancomycin (p<0.05). Although biofilms persisted even at the highest antibiotic concentrations of 128x MIC, bacterial growth was eradicated starting at concentrations of 16x MIC for vancomycin and of 32x MIC for linezolid, but not for tigecycline, up to a concentration of 128x MIC. CONCLUSIONS: In the present study on viridans streptococci isolated from patients with endocarditis, tigecycline and linezolid reduced the density of the biofilms as effectively as vancomycin. However, linezolid and vancomycin were bactericidal at higher concentrations. Linezolid and vancomycin at very high doses may be useful in the treatment of biofilm-associated diseases caused by VGS infections.


Subject(s)
Acetamides/pharmacology , Anti-Bacterial Agents/pharmacology , Biofilms/drug effects , Endocarditis, Bacterial/drug therapy , Heart Valve Prosthesis/adverse effects , Minocycline/analogs & derivatives , Oxazolidinones/pharmacology , Prosthesis-Related Infections/drug therapy , Streptococcal Infections/drug therapy , Vancomycin/pharmacology , Viridans Streptococci/drug effects , Acetamides/therapeutic use , Adult , Aged , Aged, 80 and over , Anti-Bacterial Agents/therapeutic use , Dose-Response Relationship, Drug , Endocarditis, Bacterial/microbiology , Female , Humans , Linezolid , Male , Microbial Sensitivity Tests , Middle Aged , Minocycline/pharmacology , Minocycline/therapeutic use , Oxazolidinones/therapeutic use , Prosthesis-Related Infections/microbiology , Streptococcal Infections/microbiology , Tigecycline , Treatment Outcome , Vancomycin/therapeutic use , Viridans Streptococci/growth & development , Viridans Streptococci/ultrastructure
6.
Int J Artif Organs ; 28(11): 1110-8, 2005 Nov.
Article in English | MEDLINE | ID: mdl-16353117

ABSTRACT

UNLABELLED: Surgical implants and other foreign material are increasingly used in modern medicine to restore or to improve the function of the human body. Infection of an implant is associated with considerable morbidity due to frequent hospitalizations, surgery and antimicrobial treatment. The underlying mechanism is the formation of a bacterial biofilm on the surface of the implanted body. The recognition and diagnosis of implant infections is essential for further therapy and, above all, the decision to remove and exchange the implant. METHODS: We compared the data of 60 patients with implant infections with those of 60 patients with transient bacteremia caused by Staphylococcus epidermidis. The pathogens isolated from blood were characterized with regard to antimicrobial susceptibility and formation of biofilms using a static microtiter plate model. Wild type skin isolates from non-hospitalized healthy volunteers served as control with regard to antimicrobial susceptibility and biofilm formation. RESULTS: Clinical signs and symptoms, underlying diseases and outcome were not different in either group. However, patients with implant infection had fever over a longer time (mean 12 days versus 3 days, respectively, p < 0.05) and more often positive blood cultures than patients with transient bacteremia (3.1 versus 1.2, p < 0.05). Thrombocytopenia was observed in patients with implant infections but not in patients with transient bacteremia (p < 0.05). Biofilms were formed in 86.4 % of the isolates in implant infection, in 88.8 % in transient bacteremia and in 76.9 % of the isolates from healthy volunteers (not significant). Multi-resistance to penicillin, oxacillin, erythromycin, clindamycin, ciprofloxacin and trimethoprim was more common in the hospital strains than in the wild type strains (75.6 % versus 48.7 %, p < 0.05). CONCLUSIONS: The clinical features of implant infections are indistinguishable from those of transient bacteremia. Persisting fever and multiple blood culture yielding the growth of skin flora bacteria are strong indicators for infection of implanted material. Biofilm formation and antimicrobial multi-resistance, as common in implant infection as in transient bacteremia, seem to be accessory factors in infections due to Staphylococcus epidermidis.


Subject(s)
Prosthesis-Related Infections/microbiology , Staphylococcal Infections/epidemiology , Staphylococcus epidermidis/isolation & purification , Adult , Austria/epidemiology , Bacteremia/drug therapy , Bacteremia/microbiology , Biofilms , Case-Control Studies , Drug Resistance, Multiple, Bacterial , Female , Fever/microbiology , Humans , Male , Middle Aged , Prospective Studies , Prosthesis-Related Infections/drug therapy , Prosthesis-Related Infections/epidemiology , Staphylococcal Infections/drug therapy , Thrombocytopenia/epidemiology , Time Factors
7.
Thorac Cardiovasc Surg ; 52(1): 29-33, 2004 Feb.
Article in English | MEDLINE | ID: mdl-15002073

ABSTRACT

BACKGROUND: The potentially harmful effects of normothermia on neurological outcome during cardiopulmonary bypass (CPB) are controversial. METHODS: In this study, we compared the early and late release patterns of S-100beta, a marker of cerebral injury, after normothermic and moderately hypothermic CPB. Forty-eight patients undergoing coronary artery bypass grafting were randomly assigned to either the normothermia (37 degrees C) or the hypothermia (32 degrees C) group. Serum S-100beta levels were measured until 24 h after CPB. Neurological examination was performed before and after surgery. RESULTS: With the exception of intraoperative blood glucose levels, there were no differences between groups. This also applied to peak S-100beta values (Gr-N: 3.5 +/- 1.9 microg/l; Gr-H: 3.5 +/- 3.4 microg/l) and values after 24 h (Gr-N: 0.32 +/- 0.16 microg/l; Gr-H: 0.35 +/- 0.28 microg/l). CONCLUSIONS: The similar pattern of S-100beta release without evident neurological complications in the normothermia group does not suggest an increase in cerebral injury during normothermic CPB.


Subject(s)
Cardiopulmonary Bypass , Hypothermia, Induced , Perfusion , S100 Proteins/metabolism , Aged , Biomarkers/blood , Blood Glucose/metabolism , Coronary Artery Bypass , Coronary Disease/metabolism , Coronary Disease/surgery , Creatine Kinase/blood , Creatine Kinase, MB Form , Hemoglobins/metabolism , Humans , Isoenzymes/blood , Length of Stay , Middle Aged , Nerve Growth Factors , Postoperative Complications/etiology , Postoperative Complications/mortality , Prospective Studies , S100 Calcium Binding Protein beta Subunit , Statistics as Topic , Survival Analysis , Time Factors , Treatment Outcome
8.
Br J Anaesth ; 90(2): 148-54, 2003 Feb.
Article in English | MEDLINE | ID: mdl-12538369

ABSTRACT

BACKGROUND: I.V. infusions of vitamin E emulsion (all-rac-alpha-tocopherol) may reduce ischaemia-reperfusion injury after elective cardiac surgery. METHODS: Forty patients participated in a prospective, double-blind, placebo-controlled, randomized trial, receiving either placebo or four doses (270 mg each) of all-rac-alpha-tocopherol between 16 h before and 48 h after surgery. We determined plasma concentrations of vitamin E, vitamin C, malondialdehyde, creatine kinase, troponin I and interleukin 6 and other measures of clinical outcome. RESULTS: Infusion of vitamin E caused normalization of vitamin E plasma concentrations during and after surgery, but had no effect on the early increase in malondialdehyde concentration or the decreases in antioxidative capacity and the water-soluble antioxidant vitamin C. CONCLUSIONS: Normalization of plasma vitamin E concentrations with parenteral vitamin E emulsion does not affect biochemical markers of myocardial injury and does not affect clinical outcome after cardiac surgery.


Subject(s)
Antioxidants/administration & dosage , Myocardial Reperfusion Injury/prevention & control , Oxidative Stress/drug effects , Vitamin E/administration & dosage , Adult , Aged , Aged, 80 and over , Analysis of Variance , Ascorbic Acid/blood , Cardiac Surgical Procedures , Double-Blind Method , Female , Humans , Infusions, Intravenous , Male , Malondialdehyde/blood , Middle Aged , Myocardial Reperfusion Injury/blood , Myocardial Reperfusion Injury/physiopathology , Prospective Studies , Vitamin E/blood
9.
Jpn J Thorac Cardiovasc Surg ; 49(6): 395-7, 2001 Jun.
Article in English | MEDLINE | ID: mdl-11481847

ABSTRACT

The limited availability of donor hearts means that an increasing number of transplantation candidates are temporarily or permanently supported by mechanical circulatory assist devices. We report a patient undergoing implantation of a Novacor left ventricular assist device who suffered fatal aortic dissection on postoperative day 11 after satisfactory recovery from multiple organ failure. The dissection of the aorta initially presented as an embolic peripheral ischemia. Early complete echocardiography is thus warranted to rule out dissection.


Subject(s)
Aortic Aneurysm/etiology , Aortic Dissection/etiology , Heart-Assist Devices , Postoperative Complications , Aortic Dissection/diagnostic imaging , Aortic Aneurysm/diagnostic imaging , Echocardiography , Humans , Male , Middle Aged , Multiple Organ Failure/etiology
11.
Wien Klin Wochenschr ; 113(11-12): 439-45, 2001 Jun 15.
Article in English | MEDLINE | ID: mdl-11467090

ABSTRACT

BACKGROUND: Perioperative infusion of the calcium channel antagonist diltiazem reduces the occurrence and extent of postoperative myocardial ischemia. However, recent reports also mention nitroglycerin as the drug of choice to prevent conduit spasm after coronary bypass grafting. The diagnosis of myocardial ischemia in the perioperative setting is still problematic. Dobutamine stress echocardiography (DSE) is an established technique that combines inotropic stimulation with real-time myocardial imaging and delineates normal and abnormal regional contraction patterns. We assessed the perioperative anti-ischemic effects of diltiazem and nitroglycerin during hemodynamic stress using DSE. METHODS: 50 adult patients were included in a prospective randomized study. Diltiazem or nitroglycerin was used from the onset of extracorporeal circulation until 24 h postoperatively. Dobutamine stress echocardiography was performed in a stepwise fashion 2 to 3 h after elective coronary artery bypass grafting. RESULTS: In 42 of 49 patients, dobutamine stress echocardiography either reached a level of 40 micrograms/kg/min dobutamine or achieved the target heart rate. One patient improved in terms of segmental wall motion abnormalities and three patients developed new abnormalities without corresponding electrocardiographic changes. Analysis of ischemia-sensitive parameters showed lower creatine kinase MB (p = 0.032) and troponin I levels (p = 0.1) in the diltiazem group 24 h postoperatively. Heart rate was significantly lower in the diltiazem group (p = 0.0003). CONCLUSIONS: Under conditions of hemodynamic stress, DSE revealed no significant difference between diltiazem and nitroglycerin with regard to renewed ischemia.


Subject(s)
Coronary Artery Bypass/adverse effects , Diltiazem/therapeutic use , Echocardiography , Myocardial Ischemia/prevention & control , Nitroglycerin/therapeutic use , Vasodilator Agents/therapeutic use , Adrenergic beta-Agonists , Aged , Dobutamine , Echocardiography/methods , Female , Humans , Male , Middle Aged , Myocardial Ischemia/etiology , Myocardial Ischemia/physiopathology , Perioperative Care/methods , Prospective Studies , Treatment Outcome
12.
Ann Thorac Surg ; 71(3 Suppl): S139-43; discussion S144-6, 2001 Mar.
Article in English | MEDLINE | ID: mdl-11265849

ABSTRACT

BACKGROUND: The bridge to transplantation with pulsatile mechanical assist devices became a standard procedure for patients deteriorating on the waiting list. Recently, continuous flow axial impeller pumps were introduced to clinical application offering new advantages. METHODS: From November 1998 till September 2000, 6 male patients (mean age 53 plus or minus 11 years) with end-stage left heart failure were implanted with a DeBakey ventricular assist device (VAD) axial-flow pump for bridge to transplantation. RESULTS: Three patients were successfully transplanted after 74, 115, and 117 days, respectively. Two other patients died after 25 and 133 days. One patient is still on the device after 108 days. Because of modification of the implantation technique after the first 2 patients, mean pump-flow within the first 3 weeks was increased from 4.3 +/- 0.6 L/min to 6.7 +/- 0.3 L/min. Patients were put on regular bicycle-ergometer training and improved their exercise capacities up to a mean maximum oxygen consumption of 20.2 mL/kg/min. CONCLUSIONS: Initial implants of the DeBakey VAD demonstrated support properties comparable to pulsatile pumps but without significant restrictions for extended use.


Subject(s)
Heart Failure/surgery , Heart-Assist Devices , Equipment Design , Hemolysis , Humans , Male , Middle Aged , Patient Discharge , Postoperative Complications/epidemiology
13.
Anesth Analg ; 91(6): 1339-44, 2000 Dec.
Article in English | MEDLINE | ID: mdl-11093976

ABSTRACT

To determine the thresholds of selective shunting in carotid endarterectomy during general anesthesia, we compared transcranial Doppler ultrasonography and cerebral oximetry (RSO2). During carotid cross-clamping, RSO2 and mean blood flow velocity in the middle cerebral artery (Vm,mca) was simultaneously monitored in 55 of 59 patients. A relative decrease in Vm,mca to <20% of preclamp velocity was the indication for selective shunting. Three patients were shunted, two because of criteria of Vm,mca and one in which Vm,mca measurements were impossible. No postoperative neurological deficits occurred. During cross-clamping, both Vm,mca (42+/-16 vs. 26+/-12 cm/s; P<0.001) and RSO2 (68+/-7% vs. 62+/-8%; P<0.01) decreased and a significant correlation between %Vm,mca and DeltaRSO2 was found (R(2) = 0.40; P = 0.003). Decreases in RSO2 >13% identified two patients later shunted; however, this threshold would have indicated unnecessary shunting in seven patients (false positives = 17%). Transcranial Doppler ultrasonography identified patients at risk for ischemia more accurately than RSO2. Relying on RSO2 alone would increase the number of unnecessary shunts because of the low specificity. Accepting higher decreases in RSO2 does not appear reasonable because it bears the risk of a low sensitivity.


Subject(s)
Cerebrovascular Circulation/physiology , Echocardiography, Doppler, Color , Endarterectomy, Carotid , Oximetry , Adult , Aged , Arteriovenous Shunt, Surgical , Blood Pressure/physiology , Female , Humans , Male , Middle Aged , Middle Cerebral Artery/physiology , Oxygen/blood , Spectroscopy, Near-Infrared
14.
Eur J Cardiothorac Surg ; 18(2): 187-93, 2000 Aug.
Article in English | MEDLINE | ID: mdl-10925228

ABSTRACT

BACKGROUND: Perioperative diagnosis of myocardial ischemia following cardiac surgical procedures remains a challenging problem. Particularly, the role of new conduction disturbances as markers of postoperative ischemia is still questionable. The goal of this study was to elucidate the diagnostic significance of new postoperative right bundle branch block (RBBB) for the detection of perioperative myocardial ischemia in patients undergoing elective coronary artery bypass grafting (CABG). METHODS: In 169 consecutive patients, three-channel Holter monitoring and serial assessment of serum enzymes were performed for 48 h, and 12-lead ECG repeated for up to 5 days postoperatively. Postoperative events were classified as either myocardial infarction (MI), transient ischemic events (TIE) or various conduction disturbances. RESULTS: Transient (n=9) or permanent (n=4) RBBB occurred in 13 patients (8%); 14 patients (8%) showed signs of perioperative MI and 18 patients (11%) evidence of TIE. Peak activity of creatine-kinase (CK, 561+/-135 vs. 316+/-19, P<0.05) and CK-MB (22.7+/-3.2 vs. 13.4+/-0.8, P<0.01) were higher in patients with RBBB than in patients without perioperative ischemic events. Peak CK-MB levels were significantly higher in patients with MI as compared to those with RBBB (33.4+/-7.6 vs. 22.7+/-3.2, P<0. 05). Patients with TIE had similar perioperative enzyme levels as patients with no events. CONCLUSION: It is concluded that the combined assessment of repeated 12-lead ECG, continuous Holter monitoring and enzyme analysis allows a reliable diagnosis of perioperative myocardial ischemia and conduction disturbances. The occurrence of new RBBB following elective CABG is indicative of perioperative myocardial necrosis and thus serves as a valuable tool for the diagnosis of new, perioperative ischemic events.


Subject(s)
Bundle-Branch Block/etiology , Coronary Artery Bypass , Creatine Kinase/blood , Electrocardiography, Ambulatory , Myocardial Infarction/diagnosis , Biomarkers/blood , Bundle-Branch Block/diagnosis , Bundle-Branch Block/physiopathology , Female , Humans , Isoenzymes , Male , Middle Aged , Myocardial Infarction/complications , Myocardial Infarction/enzymology , Myocardial Infarction/surgery , Prognosis , Sensitivity and Specificity
15.
Eur J Cardiothorac Surg ; 17(6): 737-42, 2000 Jun.
Article in English | MEDLINE | ID: mdl-10856869

ABSTRACT

OBJECTIVE: In coronary artery bypass grafting (CABG) without cardiopulmonary bypass (CPB) the inflammatory response is suggested to be minimized. Coronary anastomoses are performed during temporary coronary occlusion. Inflammatory response and myocardial ischaemia need to be studied in a randomized study comparing CABG in multivessel disease with versus without CPB. METHODS: Following randomization 30 consecutive patients received CABG either with (n=16) or without CPB (n=14). Primary study endpoints were parameters of the inflammatory response (interleukin (IL)-6, interleukin-10, ICAM-1, P-selectin) and of myocardial injury (myoglobin, creatine kinase-MB (CK-MB), troponin I) (intraoperatively, 4, 8, 16, 24 and 48 h after surgery). The secondary endpoint was clinical outcome. RESULTS: The incidence of major (death: CABG with CPB n=1, not significant (n.s.)) and minor adverse events (wound infection: with CPB n=2, without CPB n=1, n.s. ; atrial fibrillation: with CPB n=3, without CPB n=2, n.s.) was comparable between both groups. The release of IL-6 was comparable during 8 h of observation (n.s.). Immediately postoperatively IL-10 levels were higher in the operated group with CPB (211.7+/-181.9 ng/ml) than in operated patients without CPB (104.6+/-40.3 ng/ml, P=0.0017). Thereafter no differences were found between both groups. A similar pattern of release was observed in serial measures of ICAM-1 and P-selectin, with no difference between both study groups (n.s.). Eight hours postoperatively the cumulative release of myoglobin was lower in operated patients without CPB (1829.7+/-1374. 5 microg/l) than in operated patients with CPB (4469.8+/-4525.7 microg/l, P=0.0152). Troponin I release was 300.7+/-470.5 microg/l (48 h postoperatively) in patients without CPB and 552.9+/-527.8 microg/l (P=0.0213). CK-MB mass release was 323.5+/-221.2 microg/l (24 h postoperatively) in operated patients without CPB and 1030. 4+/-1410.3 microg/l in operated patients with CPB (P=0.0003). CONCLUSIONS: This prospective randomized study suggests that in low-risk patients the impact of surgical access on inflammatory response may mimic the influence of long cross-clamp and perfusion times on inflammatory response. Our findings indicate that multiregional warm ischaemia, caused by snaring of the diseased coronary artery, causes considerably less myocardial injury than global cold ischaemia induced by cardioplegic cardiac arrest.


Subject(s)
Cardiopulmonary Bypass/methods , Coronary Artery Bypass/adverse effects , Cytokines/blood , Inflammation Mediators/blood , Myocardial Ischemia/blood , Myocardial Ischemia/etiology , Adult , Aged , Biomarkers/analysis , Cardiopulmonary Bypass/adverse effects , Combined Modality Therapy , Coronary Artery Bypass/methods , Coronary Disease/surgery , Female , Humans , Male , Middle Aged , Myocardial Ischemia/diagnosis , Myocardial Ischemia/prevention & control , Probability , Prognosis , Prospective Studies , Statistics, Nonparametric
16.
Acta Anaesthesiol Scand ; 44(5): 586-91, 2000 May.
Article in English | MEDLINE | ID: mdl-10786747

ABSTRACT

BACKGROUND: To determine the effect of pulsatility during cardiopulmonary bypass (CPB) on cerebral oxygenation, we measured oxyhaemoglobin (HbO2), deoxyhaemoglobin (Hb) and oxidised cytochrome aa3 (CtO2) with near-infrared spectroscopy (NIRS) in 14 patients electively scheduled for cardiac surgery. METHODS: Cerebral oxygenation was measured during steady state CPB at a core temperature of 32 degrees C. Non-pulsatile flow and pulsatile flow were performed for 10 min each. RESULTS: After 14 min of CPB, HbO2, Hb and CtO2 were significantly below prebypass values. HbO2 and CtO2 did not alter with changing flow patterns. Hb significantly increased both during the period of nonpulsatile (median: -0.7 vs. 0.25 micromol/l; P<0.05) and pulsatile flow (median: 0.25 vs. 0.5 micromol/l; P<0.001). This increase was independent of flow pattern. CONCLUSIONS: Neither oxygenated haemoglobin, nor intracellular oxygenation, represented by CtO2, indicated a beneficial effect of pulsatile perfusion during hypothermic CPB. These results, however, are only valid for short time effects within 10 min before rewarming from CPB and patients without flow-limiting stenoses of the carotid artery.


Subject(s)
Brain/metabolism , Cardiopulmonary Bypass , Cerebrovascular Circulation , Oxygen Consumption , Oxygen/blood , Pulsatile Flow , Cardiopulmonary Bypass/methods , Electron Transport Complex IV/blood , Hemoglobins/analysis , Humans , Middle Aged , Oxyhemoglobins/analysis , Spectroscopy, Near-Infrared
17.
Eur J Clin Invest ; 29(11): 992-6, 1999 Nov.
Article in English | MEDLINE | ID: mdl-10583445

ABSTRACT

BACKGROUND: Laminin, a major component of the basement membrane, plays a critical role in normal cell adhesion and also during tissue invasion of pathogenic microorganisms. MATERIALS AND METHODS: Serum laminin concentrations were determined in 19 patients with Candida albicans sepsis, in 13 patients with bacterial sepsis and in 20 noninfectious controls. RESULTS: Serum laminin concentrations of both, patients with candidal and bacterial sepsis, were significantly elevated compared to the controls (486 ng mL-1 [155-924], median [range]; P < 0.01). Laminin concentrations were significantly higher in patients with Candida sepsis than in patients with bacterial sepsis on day 1 (2565 ng mL-1 [659-6064] vs. 994 ng mL-1 [386-2064]; P < 0.01), day 7 (1594 ng mL-1 [607-4611] vs. 684 ng mL-1 [284-1920]; P < 0.05) and day 14 (1444 ng mL-1 [202-2131] vs. 386 ng mL-1 [180-1658]; P < 0.05). CONCLUSIONS: Laminin serum concentrations might be useful to differentiate nonbacterial, bacterial and fungal etiology.


Subject(s)
Bacteremia/blood , Candidiasis/blood , Fungemia/blood , Laminin/blood , APACHE , Adolescent , Adult , Aged , Aged, 80 and over , Biomarkers/blood , Enzyme-Linked Immunosorbent Assay , Female , Humans , Male , Middle Aged , Reference Values
18.
J Cardiothorac Vasc Anesth ; 13(5): 544-8, 1999 Oct.
Article in English | MEDLINE | ID: mdl-10527222

ABSTRACT

OBJECTIVE: To determine the effects of hemodilution, PaCO2, PaO2, arterial pressure, and temperature on cerebral oxygenation during mild hypothermic cardiopulmonary bypass (CPB). PARTICIPANTS: Fourteen patients electively scheduled for cardiac surgery. INTERVENTIONS: Oxyhemoglobin (HbO2), deoxyhemoglobin (Hb), hemoglobin differential (Hb-diff = HbO2-Hb), and oxidized cytochrome aa3 (CtO2) were measured with near-infrared spectroscopy (NIRS) during CPB. RESULTS: With onset of CPB, a significant decrease in HbO2 (median, -4.55 micromol/L; 25th to 75th percentile, -5.5 to -3.1; p < 0.05), Hb-diff (median, -3.88 micromol/L; 25th to 75th percentile, -4.7 to -1.9; p < 0.05), and CtO2 (median, -0.05 micromol/L; 25th to 75th percentile, -0.15 to 0; p < 0.001) occurred. The simultaneous decrease in arterial hemoglobin concentration (from 11.7 to 8.5 g/100 mL, p < 0.005) correlated significantly with changes in HbO2 (r2 = 0.71; p < 0.001), Hb-diff (r2 = 0.59; p < 0.005), and CtO2 (r2 = 0.57; p < 0.005). After 24 minutes of CPB, the largest decline in HbO2 (-5.03 micromol/L) and Hb-diff (-5.68 micromol/L) was recorded, whereas CtO2 showed no changes during cooling. During CPB, Hb and Hb-diff significantly correlated with the duration of CPB, PaO2 and PaCO2. CONCLUSIONS: In early stages of CPB, a diminished cerebral oxygen supply was found, which may be caused by acute hemodilution. Despite an increased extraction of oxygen as demonstrated by the decrease in Hb-diff, cerebral energy balance reflected by CtO2 was maintained within a safe range during cooling. Because NIRS measures regional cerebral oxygenation, it is useful as an adjunct to global measures in the early noninvasive detection of cerebral hypoxia.


Subject(s)
Cardiopulmonary Bypass , Cerebrovascular Circulation , Hemodilution , Hypothermia, Induced , Oxygen/blood , Blood Pressure , Body Temperature , Carbon Dioxide/blood , Cardiovascular Surgical Procedures , Electron Transport Complex IV/metabolism , Hemoglobins/analysis , Humans , Middle Aged , Oxidation-Reduction , Oxyhemoglobins/analysis , Spectroscopy, Near-Infrared
19.
Wien Klin Wochenschr ; 111(16): 629-35, 1999 Sep 03.
Article in German | MEDLINE | ID: mdl-10510840

ABSTRACT

Because of the high frequency of acute hemodynamic deterioration in patients awaiting cardiac transplantation, mechanical techniques of circulatory support to bridge the period until transplantation have become a standard clinical procedure. Continuous-flow rotary blood pumps offer exciting new perspectives in terms of ventricular assistance and/or as a total cardiac substitute. A DeBakey VAD axial flow pump was implanted in two male patients (aged 44 and 65 years, respectively) suffering from end-stage left heart failure. In the initial postoperative period the mean flow rate of the pump was 3.9 +/- 0.5 l/min. In both patients, the early postoperative phase was characterised by a completely non-pulsatile flow profile. Two weeks after implantation and partial recovery of the natural left ventricle, increasing pulse pressures became evident and net flow increased to 4.5 +/- 0.6 l/min. Patients were mobilised and made to under-go regular physical training. Hemolysis produced by the pump was low while free haemoglobin stayed in physiological ranges, increasing only slightly from 2.1 +/- 0.8 mg/dl preoperatively to 3.0 +/- 1.5 mg/dl ten weeks after implantation. One patient was successfully transplanted on day 74 after implantation of the DeBakey VAD while the second patient is, after 110 days of pumping, still waiting for transplantation. This first experience concerning clinical implantation of the DeBakey VAD axial flow pump showed that the device is promising as a means of providing mechanical support to bridge the period until cardiac transplantation.


Subject(s)
Heart Transplantation/methods , Heart-Assist Devices/trends , Adult , Exercise Test/adverse effects , Heart Failure/therapy , Heart, Artificial/trends , Hemolysis , Humans , Male , Middle Aged , Preoperative Care/instrumentation , Preoperative Care/methods , Prosthesis Implantation/instrumentation , Prosthesis Implantation/methods , Prosthesis Implantation/trends
20.
Eur Cytokine Netw ; 10(3): 423-30, 1999 Sep.
Article in English | MEDLINE | ID: mdl-10477399

ABSTRACT

Cytokines, such as tumor necrosis factor-alpha (TNF-alpha), interleukin-6 (IL-6) and tumor necrosis factor-soluble receptor (TNF-sR), and adhesion molecules, e.g. vascular adhesion molecule-1 (VCAM-1) and E-selectin, play an important role in the pathogenesis of bacterial sepsis. Experimental data on cytokine expression during candidaemia are controversial. In this study, plasma concentrations of cytokines and adhesion molecules were compared between patients with sepsis due to Candida albicans and bacterial sepsis. Plasma levels of TNF-alpha, TNF-sR, IL-6, VCAM-1 and E-selectin, were determined in 20 patients with sepsis due to C. albicans, in 20 patients with bacterial sepsis, and in 20 controls on days 1, 7 and 14. On day 1, elevated plasma levels of TNF-alpha, TNF-sR and IL-6 were detected in both sepsis groups compared to controls. On day 1, VCAM-1 levels were higher, and E-selectin levels were lower in patients with Candida sepsis than in patients with bacterial sepsis (p < 0.05). At any time, VCAM-1 levels were significantly greater in patients with Candida sepsis than in patients with bacterial sepsis (p < 0.05). Non-survivors, regardless of the etiology of sepsis, had higher blood levels of IL-6, TNF-sR and E-selectin than survivors. The cytokines, TNF-alpha, IL-6 and TNF-sR, and the adhesion molecules, VCAM-1 and E-selectin, are involved in sepsis due to C. albicans as in bacterial sepsis.


Subject(s)
Bacteremia/blood , Candidiasis/blood , Cytokines/blood , Fungemia/blood , Adolescent , Adult , Aged , Aged, 80 and over , Amphotericin B/therapeutic use , Antifungal Agents/therapeutic use , Candidiasis/drug therapy , Cell Adhesion Molecules/blood , Female , Fluconazole/therapeutic use , Fungemia/drug therapy , Humans , Male , Middle Aged
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