Critical care medicine
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Critical care medicine · Apr 1995
Effect of extracorporeal membrane oxygenation flow on pulmonary capillary blood flow.
To validate a new application of the modified acetylene rebreathing method for pulmonary capillary blood flow in a swine extracorporeal membrane oxygenation (ECMO) model. ⋯ The modified acetylene rebreathing method is a valid and accurate method for the measurement of pulmonary capillary blood flow in the presence of ECMO flows. Pulmonary blood flow decreases as ECMO flow is increased, and the extent of decrease is directly proportional to the amount of flow through the extracorporeal circulation.
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Critical care medicine · Apr 1995
Comparative StudyBlood flow and perfusion pressure during open-chest versus closed-chest cardiopulmonary resuscitation in pigs.
To evaluate the blood flow and perfusion pressure differences observed during open- vs. closed-chest cardiopulmonary resuscitation (CPR), including the effects of epinephrine and sodium bicarbonate administration. ⋯ Open-chest CPR resulted in better cardiac output and systemic perfusion pressure than closed-chest CPR. However, cardiac output values obtained with both methods were much lower than previously reported. After epinephrine administration, cardiac output became extremely low with both methods.
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Critical care medicine · Apr 1995
Effects of inhibition of endothelium-derived relaxation factor on hemodynamics and oxygen utilization during group B streptococcal sepsis in piglets.
To determine the effects of the inhibition of endothelium-derived relaxation factor in an animal model of neonatal group B streptococcal sepsis. ⋯ Group B streptococcal sepsis in human newborns and in animal models of human newborns is characterized by a hemodynamic constellation of "cold shock"--increased vascular resistance and reduced systemic blood flow. Endothelium-derived relaxation factor inhibition during group B streptococcal sepsis in piglets exacerbated many of the adverse hemodynamic consequences of group B streptococcal infusion. We speculate that endothelium-derived relaxation factor inhibition has no foreseeable therapeutic role in neonatal septic shock.
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Critical care medicine · Apr 1995
Decreased antioxidant status and increased lipid peroxidation in patients with septic shock and secondary organ dysfunction.
To determine antioxidant vitamin concentrations, lipid peroxidation, and an index of nitric oxide production in patients in the intensive care unit (ICU) with septic shock and relate the findings to the presence of secondary organ failure. ⋯ These data indicate decreased antioxidant status in the face of enhanced free radical activity, and suggest potential therapeutic strategies involving antioxidant repletion.
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Critical care medicine · Apr 1995
Myocardial metabolic changes during reperfusion of ventricular fibrillation: a 31P nuclear magnetic resonance study in swine.
Myocardial metabolic requirements during reperfusion of ventricular fibrillation are poorly understood. The objective of this study was to determine if controlled reperfusion after a clinically relevant global ischemia period of 10 mins was sufficient to prevent or reverse myocardial ischemia as indicated by changes in myocardial high energy phosphates, myocardial intracellular pH, and great cardiac vein lactate. ⋯ Prolonged reperfusion with supranormal myocardial blood flow does not restore normal myocardial aerobic metabolism in the fibrillating myocardium after a 10-min nonperfused ventricular fibrillation period.