Determination of the Ratio of the Decantation Time and the Separation of Components in Lipoaspirate.

Decantation of the lipoaspirate is one of the most common techniques used to prepare the fat graft. The aim of the study was to determine the ideal time of decantation that provides the best separation of the components without compromising the viability of the adipocytes. METHODS: Thirty milliliters of fat were obtained from 11 healthy adults and decanted at room temperature for 0, 30, and 60 minutes. After decantation, the infiltration liquid and the remnant fat were measured with a volumetric pipette. Once the solution was removed, the remnant fat was centrifuged at 3000 rpm for 5 minutes to separate any residual solution, to measure the amount of actual fat obtained at that time point. Viability was determined with trypan blue staining for all the samples. RESULTS: After decantation, 9.4 ± 0.79 mL of fat was obtained at time 0, whereas 7.7 ± 1.56 mL was obtained at 30 minutes and 6.9 ± 0.92 mL at 60 minutes. Actual fat volume was 6.6 ± 1.56 mL, 5.5 ± 1.39, and 5.26 ± 1.3 mL, respectively. Viability at time 0 was 73.33 ± 0.06%, 72.57 ± 0.1% at 30 minutes, and 59.3 ± 0.09% at 60 minutes (P = 0.004). RESULTS: The fat grafting, processed by decantation, will have the best performance within a period of 30 minutes after harvesting, where the best rate of viability and separation of components will be achieved.

Effect of refrigeration in the viability and apoptosis of decanted adipocytes after liposuction.

OBJETIVO: Evaluar el efecto de la refrigeración en la apoptosis y la viabilidad del lipoaspirado en las primeras 2 horas después de la toma. MÉTODO: Se incluyeron 20 pacientes que fueron sometidas a una liposucción del abdomen por razones estéticas. Se obtuvieron 5 ml de grasa y se procesaron para su estudio. La viabilidad se determinó usando azul tripano. La apoptosis se determinó usando el ensayo TUNEL. RESULTADOS: Todas las pacientes eran mujeres, con una edad media de 36.5 años (rango: 21-67). Con respecto a la viabilidad, en el tiempo 0, en el grupo control fue del 59.08 ± 24% y en el grupo de refrigeración fue del 60.96 ± 22%; a los 60 minutos, los valores fueron del 50.82 ± 21% y el 55 ± 32.6%, respectivamente (p = 0.74); y a los 120 minutos, fueron del 42.69 ± 20.85% y el 50.33 ± 21%, respectivamente. En cuanto a la apoptosis, el porcentaje de células apoptóticas en el tiempo 0 fue del 37.87 ± 9.7% para el grupo de control y del 34.28 ± 9.74% para las muestras refrigeradas; a los 60 minutos, del 51.11 ± 8.64% y el 45.94 ± 9.15%, respectivamente; y a los 120 minutos, del 62.97 ± 13.33% y el 55.81 ± 9.45%, respectivamente. CONCLUSIONES: Refrigerar el lipoaspirado a 4 °C disminuyó la mortalidad y la apoptosis de los adipocitos en menos del 10% en las primeras 2 horas desde la toma.

OBJECTIVE: To evaluate the effect of refrigeration in the apoptosis and viability of the lipoaspirate in the first 2 h after harvesting. METHODS: 20 consecutive patients who underwent liposuction from the abdomen for esthetic reasons were included. 5 ml of fat were obtained and processed for study. The viability was obtained using trypan blue. Apoptosis was determined using TUNEL assay. RESULTS: All patients were female with a median age of 36.5 (21-67) years. On regard of the viability, at time 0, the viability in the control group was 59.08 ± 24% and 60.96 ± 22% in the refrigeration group. At 60 min, the values were 50.82 ± 21% versus 55 ± 32.6% (p = 0.74) and a 120 min, 42.69 ± 20.85% and 50.33 ± 21% respectively. On regard of apoptosis, the percentage of apoptotic cells at time 0 was 37.87 ± 9.7% for the control group and 34.28 ± 9.74% for refrigerated samples. At 60 min 51.11 ± 8.64% versus 45.94 ± 9.15% and at 120 min, 62.97 ± 13.33% versus 55.81 ± 9.45% respectively. CONCLUSIONS: Refrigerating the lipoaspirate at 4 °C decreased the mortality and apoptosis of the adipocytes in <10% within the first 2 h from harvesting.

Hemagglutinating activity of serovar reference strains of Ornithobacterium rhinotracheale.

In the present study, the hemagglutinating activity of 9 reference strains (serovars A-I) of Ornithobacterium rhinotracheale was investigated by using fresh erythrocytes from 15 different species: chicken (broiler, rooster, hen), turkey, pigeon, quail, duck, Harris hawk (Parabuteo unicinctus), house finch (Carpodacus mexicanus), cow, sheep, horse, dog, rabbit, pig, human (groups A, B, AB, and O), and rainbow trout (Oncorhynchus mykiss). All 9 strains agglutinated rabbit erythrocytes. None of the strains was able to agglutinate hen, cow, horse, or rainbow trout erythrocytes. The number of positive reactions among the remaining species varied. Results indicate that the use of rabbit erythrocytes is better suited for testing the hemagglutinating activity of O. rhinotracheale.