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Biomedical subjects

L G Wesson

Publications and source records attributed to L G Wesson.

At least 19 recordsLinked to original sources
PubMed1983

Some effects of preservation and acute renal failure on function and proteinuria of renal transplants.

We assessed the effects of preservation on subsequent graft function by measuring and comparing creatinine and fractional protein clearances in 18 live-related (LR) and 38 cadaver-donor (CD) grafts, the latter selected on the basis of short warm ischemia times (less than 5 mins) and stable donor hemodynamic status prior to organ recovery. CD recipients with immediate graft function had lower initial creatinine clearances and greater fractional protein clearances than LR recipients. The role of preservation in producing greater fractional protein clearance was suggested by the observation of time-dependent increasing proteinuria during continuous hypothermic perfusion of four human CD kidneys and the significant correlation between the initial degree of proteinuria at onset of diuresis and the duration of cold preservation of those CD kidneys with immediate function. One-half of CD grafts, however, manifested acute renal failure (ARF) after implantation and in these grafts no correlation between cold preservation duration and fractional protein clearance at onset of diuresis was noted. Development of ARF in CD grafts was associated with still lower creatinine clearances, but higher fractional protein clearances during the first week of diuresis. These effects of preservation and those of preceding ARF on fractional protein clearances were no longer noted 2 wk after onset of diuresis in nonrejecting CD grafts. These observations suggest the presence of preservation-induced injury to grafts even when "immediate function" occurs.

Acute Kidney Injury↗
PubMed1980

Diurnal circadian rhythms of electrolyte excretion and filtration rate in end-stage renal disease.

Diurnal excretory rhythms of Na, K, Cl and PO4 were measured in consecutive 3-hour urine collection periods in 2 subjects with advanced renal failure, one of whom was hypertensive, and had been edematous for 4 and 8 days, respectively. Inulin clearance was measured over a 39-hour span in the hypertensive patient. As compared with normal subjects studied under similar conditions, the amplitudes of all rhythms were depressed, the amplitude of K especially so. The rhythm of PO4 excretion was phase-shifted (late AM acrophase) in both patients. The rhythms of Na, Cl and K were phase-shifted in the hypertensive but not the normotensive patient. Ca and Mg rhythms measured in the normotensive subject were within normal limits of amplitude and phase, coinciding with those of Na and Cl. Amplitude of inulin clearance in the hypertensive patient was normal but with reversed phase.

Adult↗
PubMed1979

Extracellular fluid of the kidney preserved by the Collins technique.

Hilar drainage fluid of dog kidneys was analyzed as an approximation to renal extracellular fluid after preservation by flushing with chilled high K-low Na solution (Collins C4) followed by ice-cold storage for 24 and 48 hr in a bath of flushing medium. Compared with the medium, Na and Cl were increased to 30 mM/liter and K decreased slightly to 93 mM/liter. Glucose decreased, whereas lactate, lactic dehydrogenase, and creatine phosphokinase increased by significant amounts in both the drainage fluid and bath. The inulin space of the undrained kidney average 37% of wet weight. Calculated intracellular Na and Cl concentrations averaged 50 and 37 mM/kg cell water while K remained within normal limits. A significant fraction of red blood cells retained during initial flushing entered the effluent during storage. Bath and effluent composition of a human cadaver kidney approximated those of a dog.

Animals↗
PubMed1979

Diurnal circadian rhythms of renal function and electrolyte excretion in heart failure.

Diurnal cycles of glomerular filtration rate (GFR), effective renal plasma flow (ERPF), and of excretion rates of sodium, potassium, magnesium, chloride and phosphate were measured in a 22 year old man with moderately severe heart failure under standardized conditions. Cycles of GFR, ERPF and excretion of potassium, chloride, and phosphate were indistinguishable from those of normals. The phases of the sodium and probably the magnesium excretory cycles were reversed from normal. The significance of some of the observations is discussed.

Adult↗
PubMed1978

Bacterial populations of the small intestine in uremia.

The small intestinal bacterial flora of 15 patients with chronic renal insufficiency was compared with that of subjects with blind loop synDROME. 9 patients were on regular hemodialysis with high protein intake and 6 (serum creatinine 7.5 to 12.5 mg/dl) were maintained on low protein diet. The chronic renal patients harbored a greatly increased microbial flora of both anaerobes and aerobes in the duodenum and jejunum, quantitatively comparable to those in blind loop subjects. The composition did not differ significantly in the two groups. Some organisms may have the potential to metabolize substrates which reach the intestinal lumen from the diet and bile, and perhaps to generate toxic metabolites that could contribute to uremic toxicity or malabsorption.

Aerobiosis↗
PubMed1976

Amine metabolism and the small bowel in uraemia.

Intestinal intubation was carried out in 21 subjects: 9 with end-stage renal failure, 2 with early renal insufficiency, 7 untreated patients with blind-loop syndrome, and 3 normal volunteers. All 9 patients with uraemia had significantly raised duodenal dimethylamine (D.M.A.) concentrations compared with the other groups tested. Alteration of the intestinal bacterial flora with antibiotics markedly reduced serum D.M.A. and trimethylamine concentrations and modified the symptoms. Potentially toxic metabolites in the small bowel might have significant nutritional and toxic sequelae in uraemia and these findings suggest that current therapeutic approaches to the treatment of end-stage kidney disease should be re-examined in relation to bowel flora.

Anti-Bacterial Agents↗
PubMed1976

Some effects of ammonium salts on renal histology and function in the dog.

NH4Cl was infused into the left renal artery of anesthetized dogs at 50-125 mum/kg/min for up to 110 min. Renal blood flow declined early then increased to supra-control levels during infusion. Kidneys perfused at 125 mum/kg/min for 90 min showed patchy to confluent mixtures of cortical necrosis and tubular necrosis. Experimental kidneys invariably showed lower urine osmolality than contralateral controls 48 h after perfusion. Kidneys with necrosis showed depressed creatinine clearance as well. Renal artery infusion of NH4 acetate or intravenous infusion of NaHCO3 during arterial infusion of NH4Cl prevented significant acidosis and caused minimal histological changes, but depression of urine osmolality was not prevented. It is concluded that renal ammonium concentrations up to 40 mum/liter for 90 min does not cause tubular necrosis but does impair urine concentration. Severe tissue damage followed renal exposure to high ammonium concentrations in the presence of metabolic or renal acidosis.

Ammonia↗