title: Anti-tumor necrosis factor-alpha prevents decreased ventricular contractility in endotoxemic pigs.
abstract: It is not known how the decrease in left ventricular contractility following endotoxin exposure is mediated, or whether this decrease is preventable by antibodies to tumor necrosis factor-alpha (TNF alpha). Four groups of six anesthetized and instrumented pigs were pretreated with ovine polyclonal antibody to human TNF alpha (anti-TNF alpha), nonspecific IgG, or saline, and then treated with either endotoxin or saline. We measured hemodynamics and left ventricular pressures (Millar catheter) and volumes (conductance catheter). Left ventricular contractility was assessed using the slope (Emax) of the end-systolic pressure-volume relationship. Four hours after the start of endotoxin infusion in the nonspecific IgG pretreated group, Emax had decreased by 44 +/- 6% (p < 0.05), mean arterial pressure had decreased from 115 +/- 7 mm Hg to 70 +/- 10 mm Hg (p < 0.05), and cardiac output was rapidly decreasing after an initial increase (p < 0.05). Anti-TNF alpha significantly reduced the decrease in Emax (11 +/- 9%, p < 0.05), and the systemic hypotension (108 +/- 15 mm Hg to 99 +/- 6 mm Hg, p < 0.05), at 4 h, and prevented the late decrease in cardiac output. This suggests that TNF alpha is an important early mediator in sepsis leading to decreased left ventricular contractility.
authors.affiliation: Pulmonary Research Laboratory, St. Paul's Hospital, University of British Columbia, Vancouver, Canada.
authors.forename: M J
authors.initials: MJ
authors.lastname: Herbertson
authors.forename: H A
authors.initials: HA
authors.lastname: Werner
authors.forename: C M
authors.initials: CM
authors.lastname: Goddard
authors.forename: J A
authors.initials: JA
authors.lastname: Russell
authors.forename: A
authors.initials: A
authors.lastname: Wheeler
authors.forename: R
authors.initials: R
authors.lastname: Coxon
authors.forename: K R
authors.initials: KR
authors.lastname: Walley
mesh_terms: D000818:Animals; D000906:Antibodies / Q000276:immunology*; D016280:Atrial Function, Right / Q000276:immunology; D001794:Blood Pressure / Q000276:immunology; D002302:Cardiac Output / Q000276:immunology; D002306:Cardiac Volume / Q000276:immunology; D004731:Endotoxins / Q000097:blood* / Q000276:immunology; D006339:Heart Rate / Q000276:immunology; D006801:Humans; D007074:Immunoglobulin G / Q000276:immunology; D009200:Myocardial Contraction / Q000276:immunology*; D011651:Pulmonary Artery; D012756:Sheep; D012772:Shock, Septic / Q000276:immunology*; D013318:Stroke Volume / Q000276:immunology; D013552:Swine; D013599:Systole; D014409:Tumor Necrosis Factor-alpha / Q000276:immunology*; D014655:Vascular Resistance / Q000276:immunology; D016277:Ventricular Function, Left / Q000276:immunology*; D017725:Ventricular Pressure / Q000276:immunology
chemical_list: D000906:Antibodies; D004731:Endotoxins; D007074:Immunoglobulin G; D014409:Tumor Necrosis Factor-alpha