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2.
Br J Anaesth ; 114(1): 53-62, 2015 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-25240162

RESUMO

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.


Assuntos
Procedimentos Cirúrgicos Cardíacos/mortalidade , Creatinina/sangue , Complicações Pós-Operatórias/sangue , Complicações Pós-Operatórias/mortalidade , Período Pré-Operatório , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Biomarcadores/sangue , Feminino , Taxa de Filtração Glomerular/fisiologia , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Prospectivos , Insuficiência Renal/sangue , Estudos Retrospectivos , Medição de Risco/métodos , Fatores de Risco , Adulto Jovem
3.
Br J Anaesth ; 112(2): 255-64, 2014 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-24169821

RESUMO

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.


Assuntos
Albuminas/farmacologia , Coagulação Sanguínea/efeitos dos fármacos , Procedimentos Cirúrgicos Cardíacos , Derivados de Hidroxietil Amido/farmacologia , Soluções Isotônicas/farmacologia , Hemorragia Pós-Operatória/tratamento farmacológico , Adulto , Idoso , Idoso de 80 Anos ou mais , Testes de Coagulação Sanguínea/métodos , Testes de Coagulação Sanguínea/estatística & dados numéricos , Transfusão de Sangue/estatística & dados numéricos , Procedimentos Cirúrgicos Eletivos/métodos , Feminino , Hidratação/métodos , Hemodiluição/métodos , Hemodiluição/estatística & dados numéricos , Hemostasia/efeitos dos fármacos , Humanos , Tempo de Internação/estatística & dados numéricos , Masculino , Pessoa de Meia-Idade , Substitutos do Plasma/farmacologia , Lactato de Ringer , Adulto Jovem
5.
Int J Artif Organs ; 30(9): 798-804, 2007 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-17918125

RESUMO

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.


Assuntos
Acetamidas/farmacologia , Antibacterianos/farmacologia , Biofilmes/efeitos dos fármacos , Endocardite Bacteriana/tratamento farmacológico , Próteses Valvulares Cardíacas/efeitos adversos , Minociclina/análogos & derivados , Oxazolidinonas/farmacologia , Infecções Relacionadas à Prótese/tratamento farmacológico , Infecções Estreptocócicas/tratamento farmacológico , Vancomicina/farmacologia , Estreptococos Viridans/efeitos dos fármacos , Acetamidas/uso terapêutico , Adulto , Idoso , Idoso de 80 Anos ou mais , Antibacterianos/uso terapêutico , Relação Dose-Resposta a Droga , Endocardite Bacteriana/microbiologia , Feminino , Humanos , Linezolida , Masculino , Testes de Sensibilidade Microbiana , Pessoa de Meia-Idade , Minociclina/farmacologia , Minociclina/uso terapêutico , Oxazolidinonas/uso terapêutico , Infecções Relacionadas à Prótese/microbiologia , Infecções Estreptocócicas/microbiologia , Tigeciclina , Resultado do Tratamento , Vancomicina/uso terapêutico , Estreptococos Viridans/crescimento & desenvolvimento , Estreptococos Viridans/ultraestrutura
6.
Int J Artif Organs ; 28(11): 1110-8, 2005 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-16353117

RESUMO

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.


Assuntos
Infecções Relacionadas à Prótese/microbiologia , Infecções Estafilocócicas/epidemiologia , Staphylococcus epidermidis/isolamento & purificação , Adulto , Áustria/epidemiologia , Bacteriemia/tratamento farmacológico , Bacteriemia/microbiologia , Biofilmes , Estudos de Casos e Controles , Farmacorresistência Bacteriana Múltipla , Feminino , Febre/microbiologia , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Prospectivos , Infecções Relacionadas à Prótese/tratamento farmacológico , Infecções Relacionadas à Prótese/epidemiologia , Infecções Estafilocócicas/tratamento farmacológico , Trombocitopenia/epidemiologia , Fatores de Tempo
7.
Thorac Cardiovasc Surg ; 52(1): 29-33, 2004 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-15002073

RESUMO

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.


Assuntos
Ponte Cardiopulmonar , Hipotermia Induzida , Perfusão , Proteínas S100/metabolismo , Idoso , Biomarcadores/sangue , Glicemia/metabolismo , Ponte de Artéria Coronária , Doença das Coronárias/metabolismo , Doença das Coronárias/cirurgia , Creatina Quinase/sangue , Creatina Quinase Forma MB , Hemoglobinas/metabolismo , Humanos , Isoenzimas/sangue , Tempo de Internação , Pessoa de Meia-Idade , Fatores de Crescimento Neural , Complicações Pós-Operatórias/etiologia , Complicações Pós-Operatórias/mortalidade , Estudos Prospectivos , Subunidade beta da Proteína Ligante de Cálcio S100 , Estatística como Assunto , Análise de Sobrevida , Fatores de Tempo , Resultado do Tratamento
8.
Br J Anaesth ; 90(2): 148-54, 2003 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-12538369

RESUMO

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.


Assuntos
Antioxidantes/administração & dosagem , Traumatismo por Reperfusão Miocárdica/prevenção & controle , Estresse Oxidativo/efeitos dos fármacos , Vitamina E/administração & dosagem , Adulto , Idoso , Idoso de 80 Anos ou mais , Análise de Variância , Ácido Ascórbico/sangue , Procedimentos Cirúrgicos Cardíacos , Método Duplo-Cego , Feminino , Humanos , Infusões Intravenosas , Masculino , Malondialdeído/sangue , Pessoa de Meia-Idade , Traumatismo por Reperfusão Miocárdica/sangue , Traumatismo por Reperfusão Miocárdica/fisiopatologia , Estudos Prospectivos , Vitamina E/sangue
9.
Jpn J Thorac Cardiovasc Surg ; 49(6): 395-7, 2001 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-11481847

RESUMO

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.


Assuntos
Aneurisma Aórtico/etiologia , Dissecção Aórtica/etiologia , Coração Auxiliar , Complicações Pós-Operatórias , Dissecção Aórtica/diagnóstico por imagem , Aneurisma Aórtico/diagnóstico por imagem , Ecocardiografia , Humanos , Masculino , Pessoa de Meia-Idade , Insuficiência de Múltiplos Órgãos/etiologia
11.
Wien Klin Wochenschr ; 113(11-12): 439-45, 2001 Jun 15.
Artigo em Inglês | MEDLINE | ID: mdl-11467090

RESUMO

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.


Assuntos
Ponte de Artéria Coronária/efeitos adversos , Diltiazem/uso terapêutico , Ecocardiografia , Isquemia Miocárdica/prevenção & controle , Nitroglicerina/uso terapêutico , Vasodilatadores/uso terapêutico , Agonistas Adrenérgicos beta , Idoso , Dobutamina , Ecocardiografia/métodos , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Isquemia Miocárdica/etiologia , Isquemia Miocárdica/fisiopatologia , Assistência Perioperatória/métodos , Estudos Prospectivos , Resultado do Tratamento
12.
Ann Thorac Surg ; 71(3 Suppl): S139-43; discussion S144-6, 2001 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-11265849

RESUMO

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.


Assuntos
Insuficiência Cardíaca/cirurgia , Coração Auxiliar , Desenho de Equipamento , Hemólise , Humanos , Masculino , Pessoa de Meia-Idade , Alta do Paciente , Complicações Pós-Operatórias/epidemiologia
13.
Anesth Analg ; 91(6): 1339-44, 2000 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-11093976

RESUMO

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.


Assuntos
Circulação Cerebrovascular/fisiologia , Ecocardiografia Doppler em Cores , Endarterectomia das Carótidas , Oximetria , Adulto , Idoso , Derivação Arteriovenosa Cirúrgica , Pressão Sanguínea/fisiologia , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Artéria Cerebral Média/fisiologia , Oxigênio/sangue , Espectroscopia de Luz Próxima ao Infravermelho
14.
Eur J Cardiothorac Surg ; 18(2): 187-93, 2000 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-10925228

RESUMO

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.


Assuntos
Bloqueio de Ramo/etiologia , Ponte de Artéria Coronária , Creatina Quinase/sangue , Eletrocardiografia Ambulatorial , Infarto do Miocárdio/diagnóstico , Biomarcadores/sangue , Bloqueio de Ramo/diagnóstico , Bloqueio de Ramo/fisiopatologia , Feminino , Humanos , Isoenzimas , Masculino , Pessoa de Meia-Idade , Infarto do Miocárdio/complicações , Infarto do Miocárdio/enzimologia , Infarto do Miocárdio/cirurgia , Prognóstico , Sensibilidade e Especificidade
15.
Eur J Cardiothorac Surg ; 17(6): 737-42, 2000 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-10856869

RESUMO

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.


Assuntos
Ponte Cardiopulmonar/métodos , Ponte de Artéria Coronária/efeitos adversos , Citocinas/sangue , Mediadores da Inflamação/sangue , Isquemia Miocárdica/sangue , Isquemia Miocárdica/etiologia , Adulto , Idoso , Biomarcadores/análise , Ponte Cardiopulmonar/efeitos adversos , Terapia Combinada , Ponte de Artéria Coronária/métodos , Doença das Coronárias/cirurgia , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Isquemia Miocárdica/diagnóstico , Isquemia Miocárdica/prevenção & controle , Probabilidade , Prognóstico , Estudos Prospectivos , Estatísticas não Paramétricas
16.
Acta Anaesthesiol Scand ; 44(5): 586-91, 2000 May.
Artigo em Inglês | MEDLINE | ID: mdl-10786747

RESUMO

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.


Assuntos
Encéfalo/metabolismo , Ponte Cardiopulmonar , Circulação Cerebrovascular , Consumo de Oxigênio , Oxigênio/sangue , Fluxo Pulsátil , Ponte Cardiopulmonar/métodos , Complexo IV da Cadeia de Transporte de Elétrons/sangue , Hemoglobinas/análise , Humanos , Pessoa de Meia-Idade , Oxiemoglobinas/análise , Espectroscopia de Luz Próxima ao Infravermelho
17.
Eur J Clin Invest ; 29(11): 992-6, 1999 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-10583445

RESUMO

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.


Assuntos
Bacteriemia/sangue , Candidíase/sangue , Fungemia/sangue , Laminina/sangue , APACHE , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Biomarcadores/sangue , Ensaio de Imunoadsorção Enzimática , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Valores de Referência
18.
J Cardiothorac Vasc Anesth ; 13(5): 544-8, 1999 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-10527222

RESUMO

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.


Assuntos
Ponte Cardiopulmonar , Circulação Cerebrovascular , Hemodiluição , Hipotermia Induzida , Oxigênio/sangue , Pressão Sanguínea , Temperatura Corporal , Dióxido de Carbono/sangue , Procedimentos Cirúrgicos Cardiovasculares , Complexo IV da Cadeia de Transporte de Elétrons/metabolismo , Hemoglobinas/análise , Humanos , Pessoa de Meia-Idade , Oxirredução , Oxiemoglobinas/análise , Espectroscopia de Luz Próxima ao Infravermelho
19.
Wien Klin Wochenschr ; 111(16): 629-35, 1999 Sep 03.
Artigo em Alemão | MEDLINE | ID: mdl-10510840

RESUMO

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.


Assuntos
Transplante de Coração/métodos , Coração Auxiliar/tendências , Adulto , Teste de Esforço/efeitos adversos , Insuficiência Cardíaca/terapia , Coração Artificial/tendências , Hemólise , Humanos , Masculino , Pessoa de Meia-Idade , Cuidados Pré-Operatórios/instrumentação , Cuidados Pré-Operatórios/métodos , Implantação de Prótese/instrumentação , Implantação de Prótese/métodos , Implantação de Prótese/tendências
20.
Eur Cytokine Netw ; 10(3): 423-30, 1999 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-10477399

RESUMO

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.


Assuntos
Bacteriemia/sangue , Candidíase/sangue , Citocinas/sangue , Fungemia/sangue , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Anfotericina B/uso terapêutico , Antifúngicos/uso terapêutico , Candidíase/tratamento farmacológico , Moléculas de Adesão Celular/sangue , Feminino , Fluconazol/uso terapêutico , Fungemia/tratamento farmacológico , Humanos , Masculino , Pessoa de Meia-Idade
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