Assuntos
Doenças da Aorta/diagnóstico , Doenças da Aorta/cirurgia , Redes Comunitárias , Dissecação , Idoso , Idoso de 80 Anos ou mais , Doenças da Aorta/mortalidade , Doenças da Aorta/fisiopatologia , Protocolos Clínicos/normas , Dissecação/métodos , Dissecação/tendências , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Modelos Teóricos , Equipe de Assistência ao Paciente/organização & administração , Guias de Prática Clínica como Assunto , Avaliação de Programas e Projetos de Saúde , Análise de Sobrevida , Tomografia Computadorizada por Raios XAssuntos
Fibrilação Atrial/prevenção & controle , Procedimentos Cirúrgicos Cardíacos , Ácidos Heptanoicos/uso terapêutico , Inibidores de Hidroximetilglutaril-CoA Redutases/uso terapêutico , Complicações Pós-Operatórias/prevenção & controle , Pirróis/uso terapêutico , Atorvastatina , Fibrilação Atrial/etiologia , Procedimentos Cirúrgicos Cardíacos/efeitos adversos , Fatores de Confusão Epidemiológicos , Ponte de Artéria Coronária , Humanos , Complicações Pós-Operatórias/etiologia , Ensaios Clínicos Controlados Aleatórios como Assunto/normas , Projetos de PesquisaRESUMO
BACKGROUND: Diastolic dysfunction is common immediately after coronary artery bypass surgery (CABG). The duration of this phenomenon is unknown. Intravenous calcium is frequently administered during separation from cardiopulmonary bypass (CPB). We sought to determine whether intravenous calcium influences perioperative diastolic function and whether diastolic dysfunction persists into the postoperative period. METHODS AND RESULTS: Patients undergoing first-time elective CABG (n = 29) were randomly assigned to receive intravenous calcium chloride (n = 13) or placebo (n = 16) during separation from CPB. Diastolic function was assessed by the pressure-area relation with transesophageal echocardiography and pulmonary capillary wedge pressure (PCWP) measured simultaneously. Left ventricular end-diastolic area (LVEDA) and Doppler indexes were measured at comparable PCWP (within 2 mm Hg) at baseline, after separation from CPB, after sternal closure, and 3 hours after surgery. After CABG, both groups had a significant decrease in LVEDA and mitral E-wave deceleration time that persisted at 3 hours. Because there were no significant differences between the calcium and control groups at any time point, the data for the entire study cohort was analyzed. The LVEDA decreased (stiffness increased) progressively from 16.9 +/- 3.4 cm2 at baseline to 15.8 +/- 2.9 cm2 after CPB, 14.9 +/- 2.5 cm2 after sternal closure, and 14.3 +/- 3.1 cm2 at 3 hours after surgery (P <.0001). The mitral E-wave deceleration time measured at the same time points was 168 +/- 47 ms, 136 +/- 25 ms, 137 +/- 36 ms, and 111 +/- 44 ms (P =.0001). CONCLUSIONS: An increase in left ventricular diastolic chamber stiffness is nearly universal after CABG, and it persists for at least 3 hours after surgery. An intravenous bolus of calcium chloride given during separation from CPB has no measurable negative effect on diastolic function. In the setting of increased chamber stiffness, the PCWP alone does not adequately reflect the volume status and effective preload of the left ventricle.