J Trauma
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Increased fuel economy and reduced injuries have been portrayed as incompatible goals, based on the false assumption that vehicle weight is the determining factor in both. Physics predicts that size and velocity, not weight, are the primary factors affecting crash forces, while increased weight or increased velocity consumes more fuel. ⋯ Fuel use is a function of weight and horsepower. Injuries and fuel use can be reduced by reducing vehicle horsepower without changing vehicle size.
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Heat loss leading to hypothermia is common during surgery, particularly when a body cavity is exposed. To determine the principal site of heat loss we used heat flux transducers to measure heat loss from the skin and the exposed abdominal cavity of seven pigs. Heat loss from the skin was 74 +/- 15 W/m2, and from the abdominal cavity, 350 +/- 122 W/m2 (p less than 0.002; ratio = 1:4.7). ⋯ Therefore adequate insulation would reduce the incidence of hypothermia. Evaporation accounted for the largest heat loss from the abdominal cavity. Evaporative losses could be minimised by enclosing the bowel in a plastic bag.
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Cardiac injury following blunt trauma is an important cause of morbidity and mortality and is often unsuspected. Isolated chamber rupture and valvular injury are infrequent but recognized consequences of nonpenetrating trauma. This report describes a patient who developed a perimembranous ventricular septal defect and disruption of the septal leaflet of the tricuspid valve as a consequence of blunt trauma. Diagnosis and management of traumatic ventricular septal rupture are discussed.