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A technique is described for the investigation of regional lung function in infants and children using 13N and a gamma camera. Boluses of isotopic gas are inhaled and perfused while the lung fields are scanned. The child is lightly sedated and breathes normally throughout. Regional function is assessed in terms of the distribution of gas and blood, and the(More)
Mathemat i ca l problems in which some explicitly s ta ted function of ma:~y independent variables is to be minimized or maximized a n d i n which the variables may also be subjected to various explicitly s ta ted constraints (usually called the general problem ot' mathematical programming) , continue to be difficult te solve in practice. The prescott work(More)
The impact of racial background on the outcome of lower extremity revascularization is unknown because a majority of studies have a preponderance of white patients. The charts of patients between 1988 and 2004 requiring infrapopliteal lower extremity revascularization were reviewed. Life-table analyses, the Cox proportional hazards model, and log-rank test(More)
When a transmetatarsal amputation (TMA) is required, successful long-term limb salvage is questioned. We evaluated the influence of TMA on limb salvage in patients undergoing lower extremity revascularization. Patients who had distal bypasses extending to the infrapopliteal arterial tree and adjunctive TMA were retrospectively reviewed. Limb salvage was(More)
The cardiodynamic consequences of dry season dormancy in ectothermic vertebrates is not well known. Our hypothesis was that dormancy would reduce cardiac activity. We therefore determined oxygen uptake and cardiovascular function in aestivating toads, Bufo paracnemis, native to São Paulo State, Brazil. Specimens were collected and kept in the laboratory(More)
Accepted 30 October 1996 A 22-year-old man was admitted to hospital with a 14-kg weight-loss over the last 14 months, and an abnormal chest X-ray. Physical examination revealed signs of consolidation over the left hemithorax, fever, tachypnoea and tachycardia. Computed tomography (CT) was performed (figure 1) and one liter of bloody fluid was drained by(More)